Was the Big Bang the Beginning? Reimagining Time in a Cyclic Universe

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  • เผยแพร่เมื่อ 10 ม.ค. 2025

ความคิดเห็น • 940

  • @garypuckettmuse
    @garypuckettmuse 9 หลายเดือนก่อน +112

    Dr Greene makes it look so easy and relaxed meanwhile he's constantly calibrating and recalibrating the conversation for pacing, clarity, inclusion of the whole panel and overall cohesiveness. He's just an unbelievably good host and, of course, always on top of the material. Awesome presenter.

    • @GianniCostanzi
      @GianniCostanzi 8 หลายเดือนก่อน +5

      You’re definitely right, Greene is great, I loved his books and I love these videos

    • @TeunLos
      @TeunLos 7 หลายเดือนก่อน +2

      I was just thinking the same. I really learned a lot from him, and applying that in my work. But in this video there's a higher then usual amount of times he has to step in and correct hence you probably noticed it too just like me.

    • @jonjones3958
      @jonjones3958 7 หลายเดือนก่อน +1

      Indeed, he does a terrific job of managing the discussion.

    • @EarthPoweredHippie
      @EarthPoweredHippie 6 หลายเดือนก่อน +3

      I couldn't say it better myself. If all science teachers were like him, imo, we would have a LOT more kids into science and chase it as a career

    • @katrinad2397
      @katrinad2397 5 หลายเดือนก่อน +2

      Genius facilitator and leader, love these series.

  • @rachel_rexxx
    @rachel_rexxx ปีที่แล้ว +30

    These talks are great, thanks for putting them out for free

  • @danielt167
    @danielt167 9 หลายเดือนก่อน +20

    I wanna know who that guy is that queues up the animations and videos of exactly what the speakers are talking about a split second after they start talking about it.. that guy deserves a raise.

    • @EdwardHinton-qs4ry
      @EdwardHinton-qs4ry 4 หลายเดือนก่อน

      Just doing my job.

    • @HarryNicNicholas
      @HarryNicNicholas 3 หลายเดือนก่อน

      lol, it's a tricky process but it's basically called "editing", the timings are the least difficult thing, take a look at this: DaVinci Resolve 19 - Complete Beginner Tutorial

  • @sharinglanguage
    @sharinglanguage ปีที่แล้ว +22

    Fantastic.Thank you so much for organising this festival, and for its live broadcadting. I have found this conversation particularly interesting.

  • @vuurdraak-
    @vuurdraak- 9 หลายเดือนก่อน +12

    Hi another Anna here, thanks for telling this amazing story Anna, and the other people in the video :D

  • @hochathanfire0001
    @hochathanfire0001 ปีที่แล้ว +26

    " We should all work on something that is wrong." - Anna Ijjas. I am taking this to the bank 😤.

    • @MZell6789
      @MZell6789 4 หลายเดือนก่อน

      Lol for real huh 😂

  • @erichodge567
    @erichodge567 ปีที่แล้ว +54

    This was one of the best, even most important programs yet from the WSF. Thanks for letting us eavesdrop on great ideas.

    • @LordLOC
      @LordLOC ปีที่แล้ว +7

      Someone linked this to me because they know I love Astronomy and Physics (and studied Quantum Physics and Mechanics in college in the 90s) but in the "comment" they left for me, basically said "look at these so-called scientists trying to undo what god created by making it all about science which can never be proven" and I just face palmed.

    • @spiralsun1
      @spiralsun1 ปีที่แล้ว +2

      They only have half the story. Not even half… maybe some day someone will actually listen to what I am saying and understand how everything works. Then we won’t have to die so much.

    • @erichodge567
      @erichodge567 ปีที่แล้ว +4

      @@spiralsun1 , by all means, let us hear you!

    • @philharmer198
      @philharmer198 ปีที่แล้ว +2

      It is the best and important program . It shows the flawed thinking . Currently .

    • @clivejenkins4033
      @clivejenkins4033 ปีที่แล้ว +2

      ​@@spiralsun1listen to you? Who are you and what is your theory,

  • @AnnaBrownandTaiaha
    @AnnaBrownandTaiaha 9 หลายเดือนก่อน +3

    I have to say thank you for resuscitating my school education topics that I chose to learn, but had no way to pursue a career in my small country. I have to acknowledge Anna's courage to sit on this stage and hold her ground in the same esteem. You have inspired me so I thank you. I also want to acknowledge that I am enjoying observing the body language of the panel, it is so much fun to see it switch and change about when certain topics are being discussed 😎😁

    • @metubecm
      @metubecm 3 หลายเดือนก่อน

      They say "blah blah blah" percent of communication is non-verbal. ...I played bartender for a decade. It's more like 120%. Ego gets the better of the best of us. whether it true or not.

  • @memegazer
    @memegazer ปีที่แล้ว +11

    Thanks for the vid and engagement.
    Great channel for exploring

  • @steliosp1770
    @steliosp1770 ปีที่แล้ว +11

    incredible discussion about the bleeding edge of modern physics and cosmology.

  • @musicilike69
    @musicilike69 8 หลายเดือนก่อน +1

    He must be a joy to be interviewed by like this. Professor Greene is so perceptive, insightful and masterful in the art of scientific communication.

  • @U2needWorldPeace
    @U2needWorldPeace ปีที่แล้ว +12

    Brian is the GOAT. So captivating the way he gets science accross

  • @OutOfWards
    @OutOfWards 8 หลายเดือนก่อน +27

    I come here because I have no friends that want to talk about these things. (insert tears)

    • @RcStR365
      @RcStR365 8 หลายเดือนก่อน +6

      You're not alone...me too 😂

    • @ijustwanttolikecomments4677
      @ijustwanttolikecomments4677 5 หลายเดือนก่อน +1

      same

    • @BertBarnes-p8g
      @BertBarnes-p8g 3 หลายเดือนก่อน +2

      Me too

    • @HarryNicNicholas
      @HarryNicNicholas 3 หลายเดือนก่อน +1

      make them talk about it. grab them by the shoulders and shake them vigorously shouting "tell me how the universe began!!" that always works for me. or throw money at them and demand they earn it by explaining penrose conformal cyclic model.

    • @HarryNicNicholas
      @HarryNicNicholas 3 หลายเดือนก่อน

      @@RcStR365 i find the most satisfying way to engage in deep conversations about how the universe began and Einstein's equations is to hire a hooker for an hour. they usually have a PhD education.

  • @glambor1
    @glambor1 ปีที่แล้ว +9

    Very nice discussion. Thank you! 👏👏👏

  • @imrematajz1624
    @imrematajz1624 10 วันที่ผ่านมา

    9:00 standard cosmology; 14:00 theology; 16:30 problems with current model; 41:00alternative-theory+observation+simulation; cyclical model: ultra-local causal (slow spatial) contraction without spatial singularity + crunch-less bounce + constrained expansion + repeat contraction with arbitrary initial conditions...

  • @JamaaLKellbass
    @JamaaLKellbass ปีที่แล้ว +13

    first goes like, then i watch. brian never dissapoints. never

  • @nicholasperry2380
    @nicholasperry2380 8 หลายเดือนก่อน +1

    What an astounding presentation! Many years ago I saw a similar event at Cambridge University where we were introduced to plate tectonics I feel this is going to prove to be equally profound. Four very, very clever people including THE science populariser of our age have come up with an alternative to something that has always bothered me. I can usually grasp the rough idea and communicate it but inflation (in the cosmic sense) had me utterly baffled, I feel a lot better knowing that I wasn't losing it. Utter respect to all of you especially Anna whose passion shows clearly. To have achieved so much while so young is doubly incredible, to explain it in another language with such clarity is staggering.

  • @toi_techno
    @toi_techno ปีที่แล้ว +4

    Great talk
    Anna's directness is hilarious

  • @metubecm
    @metubecm 3 หลายเดือนก่อน

    No Criticisms!!! I'm just selfish and want more of the genius you gather... Absolutely love this, Thank You!

  • @_JustinCase_
    @_JustinCase_ ปีที่แล้ว +18

    Another exceptional World Science Festival event.

    • @michael-4k4000
      @michael-4k4000 ปีที่แล้ว

      We will see..... never assume as it makes ans ASS out of U & Me.... 😅

  • @Dale-ko9kc
    @Dale-ko9kc ปีที่แล้ว +23

    I love these, they are so thought expanding. They make you know not one person is in charge. We will all be a part of that particle in the end.

    • @milire2668
      @milire2668 ปีที่แล้ว +1

      much expanding. so universe. wow

    • @macysondheim
      @macysondheim ปีที่แล้ว +1

      Maybe you’ll be just a particle in the end, but not me. Speak for yourself..

    • @drakker2116
      @drakker2116 5 หลายเดือนก่อน

      ​@@macysondheimWhat will you be ?

  • @BrianFedirko
    @BrianFedirko 6 หลายเดือนก่อน +2

    It hit me like a ton of bricks. Our measure of expansion is what we see, not what is out there, because the information hasn't reached us. I read and accepted 'inflation" back in the 80's, and I always suspected it didn't matter how or why in the first second. The entire universe acts like a black hole, but once it gets too big it breaks, and it will happen again. This talk is simple and amazing. When spacetime warps and contracts, we wont see it coming. Gr8! Peace ☮💜Love

  • @mattmiller4917
    @mattmiller4917 11 หลายเดือนก่อน +5

    This is the boldest and most intriguing idea in cosmology that I have come upon since inflation itself. I need to look into this more deeply. If true, then the implications are staggering, and many ideas from Hawking radiation to multiple universes are no longer viable or necessary.

    • @francretief1
      @francretief1 8 หลายเดือนก่อน +1

      True. This is a landmark idea that may form the basis of the origin of the universe.

  • @tadpole-k8w
    @tadpole-k8w ปีที่แล้ว +6

    WSF never disappoints :)

  • @TheEnigmaUniverse-vt2pm
    @TheEnigmaUniverse-vt2pm ปีที่แล้ว +1

    Your videos are a constant source of inspiration, driving me to explore further into the mysteries of the universe. Thank you for kindling my inquisitiveness.

    • @macysondheim
      @macysondheim ปีที่แล้ว

      Erhhm thanks…How about a donation instead.

    • @marcomejia2613
      @marcomejia2613 10 หลายเดือนก่อน

      😅

  • @FilippoJr
    @FilippoJr ปีที่แล้ว +10

    Attended this live! Was a great show in NYC. Thanks Brian

    • @michael-4k4000
      @michael-4k4000 ปีที่แล้ว

      Dude it just came out lol. U couldn't have been there

    • @FilippoJr
      @FilippoJr ปีที่แล้ว +1

      @@michael-4k4000they recorded this last month, go on their website you’ll see them advertising the live show. First set of live shows they’ve had since before Covid. 🎉

    • @mbolez
      @mbolez ปีที่แล้ว

      @@michael-4k4000 what??

  •  ปีที่แล้ว +2

    amazing idea, and an amazing video. I need a second watch.. but still beautiful.

  • @thorntontarr2894
    @thorntontarr2894 ปีที่แล้ว +5

    This discussion contains many profound ideas with some usually hidden ones presented openly that are not limited to a 'cyclic cosmology'. For example, is a simulation based on a 'solid model', i.e. GR, what are the initial conditions used, i.e. spatial shear and is there an arbitrary 'sense' to it all These topics enter the discussion about one hour into the video lead with good questions by Dr. Greene. I, for one, would love to hear/see what Roger Penrose, Neil Turok and Jim Peebles have as reactions to this work.

    • @mattmiller4917
      @mattmiller4917 11 หลายเดือนก่อน +1

      I hope they weigh in on this idea as well. I've been looking for reactions but haven't found them.

  • @PhilipRhoadesP
    @PhilipRhoadesP ปีที่แล้ว +16

    Another really excellent panel discussion! - I wish I had the maths to understand all this stuff as well as the panel members . .

  • @bruceneeley1724
    @bruceneeley1724 ปีที่แล้ว +39

    It makes you wonder if we lived in a contracting universe what would our theories of the origin be... Great episode!! Thank you!

    • @johnburke568
      @johnburke568 ปีที่แล้ว +8

      That’s a great thought

    • @johnlonkert7187
      @johnlonkert7187 ปีที่แล้ว +12

      Not only is it possible, but it very well COULD be the universe we live in. Like Paul said, the expansion was measured by observations of red shift that was millions and billions of years old...we can't actually measure what the far flung areas are doing NOW. So yes, the universe could be contracting at this moment, and we wouldn't know for many, many years

    • @FelixJaeger93
      @FelixJaeger93 ปีที่แล้ว +8

      ​@@TheJoker-dj4yq it clearly is imaginable. Imagine the redshift would have turned out as a blue shift. Then people would have drawn the conclusions the person in the original comment was asking about.
      Thought experiments are never factual. That's the joke

    • @donnievance1942
      @donnievance1942 ปีที่แล้ว +12

      @@TheJoker-dj4yq Contrafactual thought experiments aren't "fairy tale fantasies." They are usually an attempt to extract a general concept that might not be apparent from observation of present circumstances. One wonders why you felt compelled to spew out such a vicious low-class comment. You're obviously emotionally unbalanced. Have yourself another chaw of terbaccy and calm down, Jethro.

    • @chaotickreg7024
      @chaotickreg7024 ปีที่แล้ว +1

      ​@@TheJoker-dj4yqHahahaha if we focused on what we only knew to be possible then science wouldn't be done.

  • @onionknight2239
    @onionknight2239 หลายเดือนก่อน

    Dang Brian what a great interview and interesting perspective. Also great questions you asked a lot of stuff that I hadn't thought about yet 👍

  • @fjbayt
    @fjbayt ปีที่แล้ว +13

    Roger Penrose Cyclic Cosmology

    • @mattmiller4917
      @mattmiller4917 11 หลายเดือนก่อน +2

      I would like to know what Penrose thinks of this idea. I could be wrong, but some aspects of it seem compatible with his concept.

    • @joeshmoe7485
      @joeshmoe7485 4 หลายเดือนก่อน

      same here, I was hoping they would bring up Penrose's ideas of CCC and how they compare.

  • @joseph5005
    @joseph5005 6 หลายเดือนก่อน

    So amazing watching this ringside view of scientists trying to figure out - what do these observations mean for our theories? Brian works his magic of bringing the rest of us wondering human family into this discussion - the modern campfire!

  • @Joshua-by4qv
    @Joshua-by4qv ปีที่แล้ว +3

    So fascinating and inspiring.

  • @efeocampo
    @efeocampo 9 หลายเดือนก่อน +1

    A "multi"-verse remains a SINGLE UNIVERSE composed of multiple universes (like ours, which could be inside a black hole), ETERNAL and INFINITE that is continually TRANSFORMED and manifests itself in many, infinite ways, whatever they are called: Human beings, Galaxies, Quasars, Black Holes, Dark Matter, Singularity, etc...
    The Universe or Multiverse only transforms: It is PURE ENERGY....
    It is impossible to prove it, but it makes no sense to have a Beginning, or an END in time, or any Space LIMIT:
    What could be BEYOND the Space "limit" of the Multiverse? Well, ANOTHER Universe...
    And what could have been BEFORE the BIG BANG? Well, another Universe or Multiverse... And once ours cools down and perhaps COLLAPSES into a SINGULARITY, perhaps it will give rise to another Big Bang... ETERNAL...!!!
    And most importantly: That Universe-Multiverse is GOD!
    A God who does not reward, punish or monitor anyone. That he is not looking out for anyone. So ENJOY your life!

  • @johnmccabe7645
    @johnmccabe7645 ปีที่แล้ว +11

    Remarkable, these concepts and their explanations. All potential Nobel winners

    • @leonidasleonidas746
      @leonidasleonidas746 ปีที่แล้ว

      Will save the Nobel for after we find out how old is the observable universe and what is beyond PS these are thoughts of an amateur young astronomer! Thank you

    • @johnhelm6231
      @johnhelm6231 ปีที่แล้ว

      Nice job 😅😮🎉

    • @kmg3658
      @kmg3658 ปีที่แล้ว

      "Establishment Participation" cookies.

  • @johnburke568
    @johnburke568 ปีที่แล้ว +3

    CCC is art. I just love it

  • @casnimot
    @casnimot 11 หลายเดือนก่อน +15

    Right now, Penrose's take on conformal cyclic cosmology makes more sense to me.

    • @lukegratrix
      @lukegratrix 5 หลายเดือนก่อน +1

      It should be the leading theory. Not necessarily Penrose, but if infinity is mathematically acknowledged, then who needs a beginning? The future and the past are infinite

  • @Michael-pe5gh
    @Michael-pe5gh ปีที่แล้ว +5

    Amazing - Thank you Brian Greene/Team .. amazing content

  • @mudpie6927
    @mudpie6927 ปีที่แล้ว +6

    I've latched onto this theory since we first heard of it

    • @truhartwood3170
      @truhartwood3170 ปีที่แล้ว

      Never latch on to any hypothesis (it's not a theory yet as we have no strong observations of its predictions and wouldn't yet expect to have any evidence that would falsify it, so we can't say that we have ruled out the things that would falsify it).

    • @mattmiller4917
      @mattmiller4917 11 หลายเดือนก่อน +2

      ​@@truhartwood3170 Why assume something negative about this comment? People should "latch on" to hypotheses and consider them as they see fit. "Latch on to" doesn't have to mean "rigidly adhere." If you never latch on to a theory and pursue it, you get no where. More likely it's time to "latch off" from the standard theory of inflation.

    • @truhartwood3170
      @truhartwood3170 11 หลายเดือนก่อน

      @@mattmiller4917 just important to be as dispassionate as possible when considering various hypotheses so that we don't cherry pick data or have confirmation bias or unduly neglect or ignore other hypotheses. That's all. Even theories should only be loosely held as "the best explanation we have right now."

    • @mattmiller4917
      @mattmiller4917 11 หลายเดือนก่อน +2

      @@truhartwood3170 Certainly, but at the same time, we all "latch on" to ideas all the time, and becoming interested in something does not necessarily imply a lack of skepticism. There is nothing in the original comment that merited your criticism.

  • @priscillawrites6685
    @priscillawrites6685 6 หลายเดือนก่อน +1

    Engaging conversation. Thank you. 👍

  • @bishopdredd5349
    @bishopdredd5349 ปีที่แล้ว +9

    Great respect for the skills of the facilitator here.

    • @erichodge567
      @erichodge567 ปีที่แล้ว

      Brian Greene is absolutely the best science presenter of our time. We're lucky to have him in the here and now.

    • @kmg3658
      @kmg3658 ปีที่แล้ว

      Salesman of the decade.

  • @HoratioHoodoo
    @HoratioHoodoo 4 หลายเดือนก่อน +1

    Why would the observable universe expand at a rate any different from the rest? What we can observe is a function of distance from our location, no? But if you take a location at the edge of what we can observe, there is causal connection from that location to an equal distance away from that point? Am I thinking about this wrong?

  • @Mentaculus42
    @Mentaculus42 ปีที่แล้ว +35

    Did they explain how entropy doesn’t ultimately WIN over accumulating cycles?! This was so interesting that it is worth a second watch. Many thanks for bringing such high quality content.

    • @c-djinni
      @c-djinni ปีที่แล้ว +9

      Have not watched yet, but isn't "the universe" pretty much the only perfectly isolated system there is? In that case, wouldn't equality satisfy entropic laws?

    • @Mutation80
      @Mutation80 ปีที่แล้ว +5

      @@c-djinni If. But we just don't know what the universe is, what's beyond. So we just don't know. The speculation is interesting though

    • @juliocortez5209
      @juliocortez5209 ปีที่แล้ว +3

      If considering entropy as a law is correct, then entropy follows a certain order (message). Furthermore, there is no such thing as chaos, just rearranging to a new order...which also does not follow the idea behind entropy. If entropy was a law, we wouldn't be here. The idea is flawed.

    • @c-djinni
      @c-djinni ปีที่แล้ว +2

      @@Mutation80 There's nothing "beyond the universe", as that would (by definition) be included in the universe.

    • @Mutation80
      @Mutation80 ปีที่แล้ว +5

      @@c-djinni we don't know, maybe we can't know. We don't know how the universe was created, what was before. For example multiverse theory where bubbels of universes keep popping up. Or brane theory, were a collision of higher dimensional branes created our universe

  • @HouseJawn
    @HouseJawn 11 หลายเดือนก่อน

    I remember when Brian Greene made gis pop sci debut on the discovery channel or TLC or something similar, PBS? I didn't care for his educational style at the time, but i have grown to LOVE Prof. Greene 🥰

  • @NashPotatoesOutdoorShow
    @NashPotatoesOutdoorShow ปีที่แล้ว +11

    I'm not sure I fully understand this stuff, but thanks for producing such great content!!!

    • @LordLOC
      @LordLOC ปีที่แล้ว +4

      Don't worry, the point is, even these giant brains don't understand it all either. That's pretty much the point of discussing and trying to understand all of this.

    • @philharmer198
      @philharmer198 ปีที่แล้ว

      @@LordLOC they don't , true .
      And discussing other theories of the Universe . ( Presented by those that know the alternative theories such as Cosmic Plasma and Electric Universe theories best ) . Not just from mainstream understanding of both theories .

    • @readynowforever3676
      @readynowforever3676 ปีที่แล้ว

      @@philharmer198 There are "theories"/hypothesis and there are ideas/suggestions. "Main stream" or not.
      If you cannot produce a model, much less mathematics, you're just day dreaming and perhaps coming up with a theme for a science fiction movie.

    • @philharmer198
      @philharmer198 ปีที่แล้ว

      @@readynowforever3676 Agreed .

    • @philharmer198
      @philharmer198 ปีที่แล้ว

      @@readynowforever3676 true .

  • @bazstraight8797
    @bazstraight8797 6 หลายเดือนก่อน

    So at 1:14 Steinhardt posits: Evidence is that inflation rate is increasing (due to dark energy) but if the potential energy curve (driving this expansion) is positive but declining than at some time it could become negative and the universe changes to slow contraction.
    I don't understand what he means by "the potential energy curve" so will just take it on faith.
    Next at 1:18 to 1:20 Galison talks about polarisation of gravitation waves (recorded in the CMB?). Again, I don't understand this. The CMB is light. Can it record a gravitational signature? (analogous to gravitational lensing?)
    And at 1:21Anna mentions the Simons Observatory is looking for such signatures. Such a signature would be proof of inflation but not finding a signature doesn't prove the Steinhardt model. Merely that the inflation signature is beyond the sensitivity of the Simons Observatory.

  • @mikeharrington5593
    @mikeharrington5593 ปีที่แล้ว +8

    I think the Universe is dynamic & animated, & pulses like a wave, producing a series of Big Bangs like a celestial sausage machine. There is no beginning and no end, except for the birth of consciousness which was needed to give meaning to all material existence.

    • @mattmiller4917
      @mattmiller4917 11 หลายเดือนก่อน +1

      Needed by us, maybe. But why would a human invention like meaning be needed for a physical process?

  • @joshsy5708
    @joshsy5708 ปีที่แล้ว

    Always like B Greene and much appreciation for finding Sir Roger Penrose and his C3 theory decades ago of cyclical big bang and his MC Escher inspiration.

  • @rosanafonseca5804
    @rosanafonseca5804 ปีที่แล้ว +3

    Muito obrigada queridíssimo Professor Brian Greene, abraçãoo ! Amooo demaaiiss este Planeta Terra Universo Magníficos e Fascinantes ! 😊👏🏻👏🏻👏🏻♥️♥️♥️🌍🌳🌴🌲🌳🌴🌲⛰️🏔️🌋🌳🌴🌲🌴🌲🌴🌳🌎🪐🌕🌍🌳🌴🌲🌳🌴🌲🌳🌴🌲🌳🌴🌲🌳🌴🌲🌏🌕🪐🌍🌕🪐🌏🌎♥️♥️♥️♥️♥️♥️♥️♥️♥️

  • @mannysinvestments2328
    @mannysinvestments2328 ปีที่แล้ว +4

    I am not sure about the 'Big Bang' but my mind is blown by this episode. Wow!

  • @stuartgreene5010
    @stuartgreene5010 11 หลายเดือนก่อน

    Couldn't this explain the Hubble Tension (around 1:16:00) if the slope of the potential energy curve is different for different methods of determining the rate assessed at different distances? Just sayin'.

  • @veerlevanrusselt1370
    @veerlevanrusselt1370 ปีที่แล้ว +4

    Не может ли быть так, что расширение вызвано самим квантовым явлением, которое нарушило суперсимметрию энергии и вернуло её в так называемое состояние со вновь возможностью квантового явления в этой суперсимметричной энергии?

    • @we8608
      @we8608 ปีที่แล้ว +1

      I was thinking something similar last night. Extreme symmetry at the start, yet a quantum particle tripped out of balance somehow.

    • @mrhassell
      @mrhassell 8 หลายเดือนก่อน

      QFT - Quantum Field Theory supports this idea, exactly as you say. I feel a little less alone in the Universe now. Thank you for making this profound remark! Спасибо

  • @SymbiosisAndre
    @SymbiosisAndre ปีที่แล้ว +1

    I just love science programs like these. Hypothesis are postulated and then discussed until there is nothing left but facts close to be 100% true. Religions, in contrast, postulate theories that may not be questioned and are almost 100% false, yet people can't let go of it. Like a ship that kept one safe for years, but is sinking now, goes down with those that hang on to it, while those that accept the fact, start swimming and stay on the surface, at least for a while

  • @duran9664
    @duran9664 ปีที่แล้ว +3

    💭 💭💭💭
    If time in the whole universe stops for billions of years long then resumes, we wouldn’t be able to notice!
    🤯🤯 🤯

    • @philharmer198
      @philharmer198 ปีที่แล้ว

      Because time has no cause , effect and affect upon anything(s) physical existence , dynamics ( nor space its self ) . Time is not a true three dimensional dimension . Time can not change any movement by any physical thing(s) . Nor Life . A true three dimensional object could change the movement in and of themselves ; of three dimensional objects .
      Time in the context of the Universe doesn't matter . It doesn't . Anyway , the stop in time would not be the stop of movement .
      Movement is independent of time . But time is not independent of movement .

  • @0ucantstopme034
    @0ucantstopme034 8 หลายเดือนก่อน +1

    This is surely interesting. But what got the cycle going in the first place? What started the first expansion/contraction?

  • @blanksinatra112
    @blanksinatra112 ปีที่แล้ว +4

    I like the Roger Penrose theory, way more elegant!

  • @hungrydave1977
    @hungrydave1977 ปีที่แล้ว +5

    This is really good. Im always sceptical of things that seem bolted on to fix problems - inflation, dark matter etc

    • @crehenge2386
      @crehenge2386 ปีที่แล้ว

      Only it's not, unlike this idea those ideas are based on actual physics and observations

  • @nunomaroco583
    @nunomaroco583 ปีที่แล้ว +1

    Amazing talk, great theory strong again. ....

  • @kx4532
    @kx4532 ปีที่แล้ว +4

    Can there maybe be superluminal blast waves in the vacuum? Maybe much much larger than the visible universe?

    • @TheOleHermit
      @TheOleHermit ปีที่แล้ว +4

      The answer depends upon your definition of 'superluminal blast waves'. Sounds like a made up Star Wars term, IMO.

    • @kx4532
      @kx4532 ปีที่แล้ว +3

      @@TheOleHermit Where the vacuum itself is compressed by an external event. Maybe an intense gravitational wave from somthing that's unprecedented on the scale of our visible universe.

    • @TheOleHermit
      @TheOleHermit ปีที่แล้ว

      @@kx4532Nonsense.

    • @kx4532
      @kx4532 ปีที่แล้ว +1

      @@TheOleHermit I mean, I'm just a schmo online I can't back this up.

    • @TheOleHermit
      @TheOleHermit ปีที่แล้ว

      @@kx4532IOW, your comments have no integrity and are meaningless. Don't you think the world already has more than enough online disinformation schmos? /smh

  • @phtoed
    @phtoed ปีที่แล้ว +2

    what they fail discuss is the causal mechanism for the expanding universe (currently reported with a large time lag) to reverse to a contracting universe in the observable space. Otherwise an excellent presentation.

  • @27.versus.Entertainment
    @27.versus.Entertainment ปีที่แล้ว +20

    I was born yesterday and I have never thought the Big Bang was 'the beginning'. There was the " 1st Bang", "2nd, 3rd etc etc and now were here.

    • @sabotagesabotage7927
      @sabotagesabotage7927 ปีที่แล้ว +1

      It hasn’t even been a day since my birth and already I completely agree with you

    • @D1N02
      @D1N02 ปีที่แล้ว +1

      More likely there are many bangs and many universes. They don't return to a singular state, but drift apart and ultimately evaporate.

    • @robertm3561
      @robertm3561 ปีที่แล้ว +2

      @@D1N02I don’t think so. Is there any Evidence to your claim? You would have to demonstrate the process, where materia has been created from absolute nothing. No materia equals no action imo..

    • @CD11
      @CD11 ปีที่แล้ว +2

      Kids these days.. 😬

    • @D1N02
      @D1N02 ปีที่แล้ว +5

      How can I do that when there is obviously no complete understanding of physics. It is just ockhams razor that nothing is singular, so why should a universe be. We are part of it so we cannot look beyond or before it.

  • @TheRedMiners
    @TheRedMiners 5 หลายเดือนก่อน

    Could someone explain how your range of causal contact can decrease when the universe is contracting? During contraction everything comes closer to you. So shouldn't you get into causal contact with more and more matter? They said that somehow your horizon can shrink faster than the rate the universe is contracting. There is something I'm misunderstanding here.

  • @DeconvertedMan
    @DeconvertedMan ปีที่แล้ว +3

    science is awesome! :)

  • @robindevries4857
    @robindevries4857 3 หลายเดือนก่อน

    I do love The World Science Festival, amazing discusions. I do not understand all they say, but still.

  • @kx4532
    @kx4532 ปีที่แล้ว +12

    It's clear that there was rapid expansion and that the universe is much bigger than the tiny piece we can observe. What is this space stuff were all waving in anyway?!

    • @Raja-qt7kl
      @Raja-qt7kl ปีที่แล้ว

      Something that doesnt react to matter, forces or light. Its black just because our eyes recieve no photons from thier. There might be more colours or other kinds of matters in it.

    • @philharmer198
      @philharmer198 ปีที่แล้ว

      Here is the thing about the expanding Universe theory . Expansion looks the same . Everywhere in the Universe . They all cancel each other out . Imagine a Life being looking out into the stars , then galaxies etc . Then come advanced enough to have telescopes , as Advanced as ours . Their Thinking is as Advanced as Ours .
      They would conclude that the Universe is expanding as well . Put together , expansion theory has a problem ; it can be cancelled out .

    • @rewar5870
      @rewar5870 ปีที่แล้ว +1

      Wait, I was told space bends around mass , mass I think is usually made up of matter , but your saying it doesn't react to matter ?

    • @kx4532
      @kx4532 ปีที่แล้ว +1

      @@rewar5870 Consider a spring with a load, now increase the load dynamically.

    • @diegogamez3906
      @diegogamez3906 ปีที่แล้ว

      Could it be the whole universe on the palm of GOD

  • @helicalactual
    @helicalactual ปีที่แล้ว +2

    how did they get to be the same temperature? gravity on the PODE. the PODE itself would be extremely close to uniform and the mechanism that actually made the big bang expand is still not yet understood. so that could also play a part.

  • @brad4231
    @brad4231 ปีที่แล้ว +6

    Here’s the thing: we live in a 3D reality and we simply don’t have the sensory capacity for X(we don’t know what we don’t know) so we can’t possibly understand higher dimensional information that is absolutely necessary to know this equation, much less solve it

    • @abjee1602
      @abjee1602 ปีที่แล้ว +1

      Love your confidence

    • @thenotoriousbfg4960
      @thenotoriousbfg4960 ปีที่แล้ว +2

      Even if true, this doesn’t necessarily preclude us from discovering it. We just might take a really, really long (unpredictably long) time to stumble upon it.
      Please don’t discount our species’ ability to understand/create/destroy things that are still nearly inconceivable in 2023.

  • @elodvezer1790
    @elodvezer1790 ปีที่แล้ว +8

    I love how sure everyone is of themselves in the comments❤😅👹

    • @kricketflyd111
      @kricketflyd111 ปีที่แล้ว

      They make money teaching this narrative. 😮

  • @sobekneferu4041
    @sobekneferu4041 ปีที่แล้ว +1

    interesting. I need to re watch so I can better understand, but their idea does make sense.

  • @D1N02
    @D1N02 ปีที่แล้ว +3

    According to the bible:
    First there was nothing
    Then there was light

    • @KAT-dg6el
      @KAT-dg6el ปีที่แล้ว +2

      And according to your Bible the earth and universe is 6000 years old.

  • @12MANY
    @12MANY ปีที่แล้ว +2

    Great show

  • @jinstinky501
    @jinstinky501 ปีที่แล้ว +26

    My cats breath smells like cat food.

    • @jefflappin
      @jefflappin ปีที่แล้ว +1

      I'm wearing a bathrobe, and Im not even sick!

    • @ecospider5
      @ecospider5 ปีที่แล้ว +1

      I think this is more relevant than the video to my life. 🤣🤣

    • @grevenstjube
      @grevenstjube ปีที่แล้ว

      - did your cat eat another cat ???

    • @dogsbollox4335
      @dogsbollox4335 ปีที่แล้ว

      The us these comments need redacting😁😁

    • @jeremycrumrine6091
      @jeremycrumrine6091 10 หลายเดือนก่อน

      That’s not cat food

  • @ChristbattleaxeMinistry-zc7ii
    @ChristbattleaxeMinistry-zc7ii 5 หลายเดือนก่อน

    There is a mathematical description of the universe by a man called, Sotade Olusegun. His research publications are so insightful to explain the nitty-gritty of the Universe. I will suggest that you get his TH-cam videos as you search through TH-cam by his names. He usually puts the links to his research publications in the description sections of his videos on TH-cam.

  • @wulphstein
    @wulphstein ปีที่แล้ว +3

    Dear aliens 👽: what should I do if I live on a planet where the reasoning of the physics community is cracked?

    • @philharmer198
      @philharmer198 ปีที่แล้ว +2

      What reasoning is cracked ? ( I'm not an alien by the way . I'm a Human asking this question ) . What reasoning is cracked ? To you .

    • @davidletsch3198
      @davidletsch3198 ปีที่แล้ว +2

      ​@@philharmer198I actually see this weird state of unnecessary confusion in the current scientific interpretation of important science experiments such as those supposedly "proving" the loss of "realism" in the violation of Bell's Inequality. The assumptions that he made were simply not consistent with a determinatistic reality. He therefore assumed nondeterminism to prove nondeterminenism.

    • @wulphstein
      @wulphstein ปีที่แล้ว

      @@philharmer198 The mechanism that causes physics to exist is a sphere that expands at the speed of light. There are many hints of that. The big bang began as a point that expands. Light cones are really just expanding spheres. Huygens Principle of wavelets. The wave function of the two slit experiment. I don't know why we're talking about superstrings when expanding spheres of wave functions seems to be more accurate a description.

    • @wulphstein
      @wulphstein ปีที่แล้ว

      @@davidletsch3198 Spooky action at a distance (entanglement) must be creating confusion. Isn't the most reasonable explanation that there is something between entangled particles, something that we can't detect?

    • @philharmer198
      @philharmer198 ปีที่แล้ว +1

      @@wulphstein a sphere of what exactly ? Why does the sphere expand ?

  • @steveburk1045
    @steveburk1045 หลายเดือนก่อน

    As described, it seems that slow contraction and ultralocality are not terribly sensitive to the form of the scalar potential field (provided it is negative). But I would like to know much more about how "hands on" the modeller must be in creating a temporally varying potential that transitions from slow contraction, into a bounce, and then on to a phase of expansion. In a robust theory, one would want that transition to happen as a result of model physics and not solely because the modeller had prescribed it to occur. For instance, one would want the transition from contraction to a bounce to begin as a result of a natural physical process rather than the modeller prescribing that transition [in the same way model hurricane tracks are determined by physics/ dynamics, not pre-specified].

  • @250txc
    @250txc 7 หลายเดือนก่อน

    How much time \ input do these guys spend with the software designers and programmers that code \ produce these software simulation applications?

  • @TheMadmacs
    @TheMadmacs ปีที่แล้ว +1

    fantastic panel.

  • @EarthPoweredHippie
    @EarthPoweredHippie 6 หลายเดือนก่อน

    I would like to know what the equal but opposite reaction was to the big bang, if the bang went out in all ways then what went in, in all ways? Could this be a dual universe system? Creating a totally opposite universe where the laws of physics/reality are turned 180°.

  • @ksingh7149
    @ksingh7149 ปีที่แล้ว +2

    thank you so much.

  • @Micheal313
    @Micheal313 11 หลายเดือนก่อน +1

    How can "the universe" be functionally/computationally bounded but produce the computational irreducible virtual phenomen that we call consciousness?
    Maybe there's something more to being. I often feel like my subconscious knows a lot more than my ego, but it won't tell for some reason.

    • @thomabow8949
      @thomabow8949 8 หลายเดือนก่อน

      "computational irreducible virtual phenomen that we call consciousness? " I do not think this has a consensus among empirical philosophers, the sciences, or even many rationalist philosophers for what the definition and nature of consciousness is. Or, more that it is not ultimately a reducible and material phenomenon. Furthermore, cosmological inferences are not exactly "bound" by our on inferences on consciousness; if they are incompatible in their natures, then they need further exploration.

    • @Micheal313
      @Micheal313 8 หลายเดือนก่อน

      @@thomabow8949 Fair enough.. "cosmological inferences are not exactly 'bound' by our inference on consciousness". I was preceptively overzealous at the time when trying to communicate my thoughts. Allow me to take the time later to make my points clear.

    • @Micheal313
      @Micheal313 8 หลายเดือนก่อน

      @@thomabow8949 ya so everything that we can infer logically will also be computational. Would you agree with that at least?
      I should have taken more time and not thrown the term "bounded" but I did anyway so let's explore what I meant.
      What I mean by "how can the universe be functionally / computationally bounded" as a question, I mean about the recognizable axiomatic nature of what we consider the interior of the universe.
      We have quantum mechanics as a yolk and gravity as a shell. Its mathematical/computational on the inside at least.
      Lmk if you agree or disagree at this point..
      Eventually I want to draw a teleological tautology that places a conscious arbiter at the center.

    • @Micheal313
      @Micheal313 8 หลายเดือนก่อน

      @@thomabow8949 I only now realized we're talking to each other in multiple conversations.
      But anyway..
      You said that there's not a definition/consensus for consciousness among authorities. That's because they already conceded that conscious experience cannot be quantified or virtualized.
      There's absolutely plenty of smart people who don't even question it anymore because it's glaringly obvious that we can't reproduce subjective conscious experience.
      It's as computationally irreducible as the universal wave function/universe.

  • @martinrutley-wk5ds
    @martinrutley-wk5ds ปีที่แล้ว

    How did we get the low entropy of the big bang?😅

  • @drMerényiAttilaBoxdokiSsdCoach
    @drMerényiAttilaBoxdokiSsdCoach ปีที่แล้ว +1

    The pronunciation of Anna is very similar to the pronunciation of Neumann, Wigner, Szilárd, Teller and Kármán

  • @stevemarks1511
    @stevemarks1511 11 หลายเดือนก่อน +1

    Great Great question! I bow to you Profesor Greene. Like a great book you open our minds and I thank you daily.
    Question: one implies a God if pre bang didn't exist. And time may be man made but pre big bang may of been a plate of gasses that came from even mutation and or evolution where and how did they start.?
    And think that the universe is still forming and it will expand as it cools it may slow and retract and effect gravity as the stars burn out billions and billions Of years from now; note new Suns are being born so this may take eternity.
    ?

  • @imrematajz1624
    @imrematajz1624 10 วันที่ผ่านมา

    It would be great to contrast two cyclical models on the one hand presented by Prof. Steinhardt and Dr. Ijjas with that of Prof. Roger Penrose on the other.

  • @BrianFedirko
    @BrianFedirko 9 หลายเดือนก่อน +1

    Zero entropy is a weird way to look at anything, as you can simply assume just limiting space/time to a point could be all entropy at the same look. It doesn't have to make sense that way of looking at entropy. Entropy is a deceiving concept. Personally it's always bugged me. Why isn't a singularity entropy anyway you look at it? Gr8! Peace ☮💜

  • @MichaRoki
    @MichaRoki ปีที่แล้ว +1

    What about Penrose and Meissner with aeons theory?

  • @WooliteMammoth
    @WooliteMammoth ปีที่แล้ว

    Does anyone know when this lecture occurred? Late 2023 I imagine?

  • @veerlevanrusselt1370
    @veerlevanrusselt1370 ปีที่แล้ว +1

    Разве гладкость не возникает, если к энергии противоположного расширения добавить гравитационную энергию?

    • @KJUgrin
      @KJUgrin ปีที่แล้ว

      No. Dark energy (inflation) is stronger because there is FAR more empty space than there is matter & mass enough for gravity. Gravity effects much less space than dark energy.

  • @koilerREC
    @koilerREC 10 หลายเดือนก่อน

    it always bothers me if somebody is saying the universe is expanding into, into like what? so even if you imply there is something, you can not explain the universe. It has to be part of it right? Other wise our definition of "Universe" is not yet complete.

  • @riteshchaubey8660
    @riteshchaubey8660 8 หลายเดือนก่อน +1

    There's a concept of cyclical time and the universe in Hindu scriptures, especially Rig Ved . It talks of eternal creation and destruction of the universe and time. Shiva is the entity that drives the time and Vishnu controls the space. Shakti is the energy that gives birth to matter. Time dilation , which has been proven, the Mahabharata says 100 years of Brahma is 311.04 trillion years, which is roughly the life span of our universe.This concept given in these scriptures make me see everything with a scientific eye and encourage my curiosity to know more and more about our universe.
    " There was neither non-existence nor existence then;
    Neither the realm of space, nor the sky which is beyond;
    What stirred? Where? In whose protection?
    There was neither death nor immortality then;
    No distinguishing sign of night nor of day;
    That One breathed, windless, by its own impulse;
    Other than that there was nothing beyond.
    Darkness there was at first, by darkness hidden;
    Without distinctive marks, this all was water;
    That which, becoming, by the void was covered;
    That One by force of heat came into being;
    Who really knows? Who will here proclaim it?
    Whence was it produced? Whence is this creation?
    Gods came afterwards, with the creation of this universe.
    Who then knows whence it has arisen?
    Whether God's will created it, or whether He was mute;
    Perhaps it formed itself, or perhaps it did not;
    The Supreme Brahman of the world, all pervasive and all knowing
    He indeed knows, if not, no one knows. "
    --- Nasadiya Sukta, Rig Veda

    • @EarthPoweredHippie
      @EarthPoweredHippie 6 หลายเดือนก่อน

      Thank you for bringing this up. Ppl are too quick to brush off ancient writings, unless is Christian. I appreciate you.

  • @helicalactual
    @helicalactual ปีที่แล้ว +2

    Dr Green, if the universe is entangled, then why did it have to interact locally with one another? couldn't entanglement have acted as a mechanism that could have transmitted information even though it was not acting locally thus smoothing out the universe during these phases?

  • @julicaruso
    @julicaruso 11 หลายเดือนก่อน

    I'm not a native in English speaker neither a physics specialist (not even a student) so I could be missing key things here, but I don't understand what could trigger the bounce phase, and besides that, how is that the smoothing process doesn't contradict entropy? Could someone help me understand this o fill in the gaps i'm missing here, please?

  • @johnmarshall3252
    @johnmarshall3252 10 หลายเดือนก่อน

    What if spontaneous creation / destruction of matter and energy at the quantum level AND expansion / compaction at the cosmological level are not mutually exclusive? And what if the expansion is heavily biased in the spatial dimensions and the compaction is heavily biased in the temporal dimension? Can you run your models using these assumptions and see how they might influence the model's ability to describe observation?

  • @TimothyPalmer-y2k
    @TimothyPalmer-y2k ปีที่แล้ว

    Might it be that expansion and contraction are both present together, working in tandem? Galaxies can be expanding as a whole, while within each galaxy pockets of contraction might provide the smoothing until an equilibrium is obtain?

    • @truhartwood3170
      @truhartwood3170 ปีที่แล้ว

      No, since the smoothing is on a cosmic scale, what's happening in galaxies wouldn't account for it.

  • @MH-mc3pp
    @MH-mc3pp 11 หลายเดือนก่อน

    The bounce violates the null energy condition, which is a necessary property of relativistic quantum mechanics. Why was this not discussed?

  • @dennisnew335
    @dennisnew335 หลายเดือนก่อน

    Is it possible that the universe is in a time loop where the big bang keeps happening and collapsing almost instantly, each bang and collapse counting as a very minuscule segment of time for us? This might explain the odd behavior of light and other particles, they are always being slightly shifted or displaced by a constant big bang that’s just nearly instantaneous, if you could figure out how far apart each bang was it might be easier to determine what a particle will do, it might also give off the impression that we are a hologram? I realize the universe is expanding so fast that there’s not enough gravity to pull it back together but if it expanded faster than light then there is a chance it could start to move backwards in time and then you would not need gravity. Additionally, the big bang could have been caused by itself, time can be strange. what if it was going to bang and it preemptively collapsed in on itself first, causing the bang, sort of like a man getting in a time machine and going back to a time to meet himself before he gets in the time machine.

  • @reversetransistor4129
    @reversetransistor4129 ปีที่แล้ว

    I don't understand the last stage of contraction must be made faster than light, will be needed a great amount of energy.

  • @MZell6789
    @MZell6789 4 หลายเดือนก่อน

    Who does The Animations?

  • @wulphstein
    @wulphstein ปีที่แล้ว

    Why couldn't the big bang have begun as a single photon with energy E = hf = energy of the big bang? Would that explain the homogeneity of the universe?