Victoria Kaspi Public Lecture: The Cosmic Gift of Neutron Stars
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- เผยแพร่เมื่อ 3 ก.พ. 2016
- In her Feb. 3 talk, Dr. Victoria Kaspi of McGill University, explored neutron stars -- mysterious celestial objects can shed light on some of the most vexing questions in the universe.
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I was intellectually aware of the periodicity but it was like being blind till I heard the periods - like a flash of light in my brain. For that alone, I found this a worthy lecture so thankyou Dr Kaspi.
Neutron stars are totally fascinating.
The power they produce is mind bending.
Excellent talk. Thank you Dr. Kaspi, and the Perimeter Institute. It is these kinds of talks in science (physical, social, biological) and history that make the internet so fascinating.
Victoria has distilled most interesting facts about neutron starts in this astonishingly accessible lecture. Wish I had a professor like that!
Sorry but their where no facts released here and nothing to back them up.
claims with out evidence can be dismissed with out evidence,
this does not just apply to religious claims.
personal opinion is not evidence or facts.
Thank you to Dr. Kaspi and the Perimeter Institute for Theoretical Physics
for this excellent presentation, I loved it.
Thanks for a fascinating talk! Pulsars & neutron stars in their various forms really sound like incredible objects that can teach us some very important things about our universe. I thoroughly enjoyed this, and look forward to more info! 𝓽𝓪𝓿𝓲.
A gifted scientist and teacher, who, in my opinion, presented one of the FINEST presentations on the topic. A CLASSIC.
A real life superhero! An amazing talk that I could watch and listen to over and over.
But there are so many to listen to.
The kids in the Q&A section at the end! Love it!
I read a great sci-fi book called Dragon 's Egg about a nuetron star that makes a far approach to the solar system, and a team is sent to investigate. It happens that this star is inhabited by sentient creatures that are quite small but so very intelligent. I. Won't spoil the book any further. I am so glad to be a member of a species that has eyes. Plus a curious nature that loves all things considered a bit different. I. Love this professor's enthusiasm and zeal. Long maay the stars shine down upon her!
i love the way she always says "we believe" or "we think", too many people talk as if this theories are fact
This is awesome. I’ve been waiting well over a decade to see if someone In the field would record the radio waves and arrange them into a musical composition. Not quite what I had always imagined it as, but it’s real! That was super cool to hear. Loved this lecture.
Great talk. Learnt some new stuff. Thanks for making this accessible. PS. I'm just blown away by the thought of attosecond precision -- not just that the rotational period is so precisely regular but that humans have developed the means to measure it!
Learned.
@@peterolbrisch1653 not if you were born in England where English is the dominant language.
@@TechNed Peter Olbrish is burnt.
Beautiful lecture! Thank you very much.
Lies again? National Service
Wonderful and enlightening talk. This is a gem.
Fantastic presentation. Thanks. Also thanks for sharing these lectures online.
Fantastic talk. I’m in no way a intelligent person, but after watching your lecture about neutron stars I’m much better informed. Easy to listen, easy to understand, thank you so very much Victoria.
I would disagree with you. By choosing to watch this presentation, out of curiosity perhaps, you demonstrate that you ARE an intelligent person. Don't sell yourself short. Cheers.
"LIGO is an amazing experiment that's likely to yield some interesting fruits soon." she says one week before the announcement that LIGO actually detected gravitational waves.
I wonder if she knew already.
+mrspidey80 I am guessing so .. because I believe that they detected them a lot earlier .. like many months before.. But before any announcement can be made everything has to be verified many times which takes time ....
Unlikely that she knew any more than the rumours that were going around before the announcement, thanks to Lawrence Krauss having tweeted about the possible detection. Only LIGO members knew for sure and she is not a LIGO member.
@@BadtemperedandGrumpy you are right 101% i belive.
She probably knew or had heard. It was leaked out by some of the people there, probably by accident. Meaning they were so excited that they told friends and family and then they couldn’t help but to leak that further. LIGO was under pressure for a while to make the announcement because the information was swirling around prior to Lawrence Krauss tweeting anything. Ligo was getting a lot of phone calls asking if it were true. Not to mention that it was known at two locations and they had talked to each other of course.
you believe that gravitational wave BS. LOL, they don't know what they detected, most think it's just background noise as the group from Denmark. This woman loves to tell 'stories' and she may believe he own bs stories but in the end ... they found just what they were looking for but as One Physicist said, "In that jumble of noise you could extract anything from it"
Thoroughly absorbing video, one of the best I've watched.
Packed with detail I'd never seen before and very well illustrated by understandable graphics/animations. Plenty of bonus "fun facts" and clever references.
This lady has great presentational skills (hope that praise can be fed back).
Only criticism: the demo sounds were too loud.
Minor disappointment: Jocelyn who first "discovered" pulsars, and who tutored me one year - bless her, was not credited.
Love this stuff so much! Life is amazing
Excellent and thought provoking presentation.
Absolutely & positively the best video I've seen re "neutron stars" --- i.e., supernova-remnant cores [SRCs]. Good job, Dr. Kaspi !!
Loved the cosmic music. Thanks for the great class.
Such a great speaker!! PL lectures are aways great sound and presentation .
She seems really cool.
I want to point out that this lecture fully gave me a glimpse towards things I didn't knew at the moment about NSs, which currently I am working on. Things said here I never heard of before will help me a lot for my dissertation due this year, and possibly this video might have saved me from reading a bit!, but totally will make me read more and more from related-topics works!! Thank you very much.
Awesome lecture. Thanks for sharing.
Thank you Dr. Kaspi. raphael santore
Merci Victoria!
I LOVE THESE LECTURES!!!!
Excellent talk, really informative
Thanks so much that was a brilliant lecture
I'm going to visit CERN this week. Obviously intrigued. When I return. I Would turn to P I. Thanks for the work and success and promoting it.
Upvoted for 'original spin'.
I'm thankful for this lecture series
It's OK, worth a bump anyway.
AmxCsifier Oh yeah, how about your mom and your dad and your uncles and your grandpa And grandma.
That’s insensitive you should have also mention the Petri dish!
She made this subject a lot of fun
really, really interesting and so well pitched so as numpties such as me could follow... welll done guys and thank you
I'm just burnin doin the neutron dance.
JustOneAsbesto Woo hoo!
"Original spin", ha, ha, ha!
Very good lecture! Detecting super massive black holes would be awesome.
You must be happy now that we have 2 pictures of 2 supermassive black holes
Between PI and WSF I get so much information on deep ideas. Thank you so much.
A dim audience, however some asked really good questions! I liked her way of speaking and jokes. Braver then 007!
I have literally no idea how I got here, but this is fascinating!!
Amazing lecture
Very nice and well thought out comment. Up there with some of the best ever. ❤
Dr. Victoria Kaspi LOVE you LOads big hugs & kisses xxx love Matt
Great lecture, thanks.
7 days before the gravitational waves discovery was announced
Binary pulsars as gravity wave detectors is some next level scientific awesomeness. Would not have thought of that. I got a kick out of the original spin joke which was probably due to never having heard it before. Most sciencey jokes are painfully lame but that one was halfway creative.
That was awesome....makes me wish I was a scientist!
you can be if you want
These talks are great, I learn the latest in Astrophysics which fascinates me, and these Professors are clear and give lots of info about the subject. Neutron stars are great, we could in a distant future go near them and farm the abundant free energy they produce, capture electrical charges directly in huge capacitors, and also maybe directly magnetic energy too and bring those to colony planets, same thing with the streams of Black Holes, and plug my charger hahaha. Keep up the good presentations, update presentations on the subjects would be great too, this is from 4 years ago, I'd assume we have news, even short presentations would be OK for me.
@trf12567 You assume too much, the further we predict something, the more inexact tends to be. You assume with certain pretentious arrogance, we'd be free from energy sources, we'd be fine, no such thing, Nature has a way to take as much as it gives, so we'll always need to spend energy, therefore produce it, and in the large scale of space colonization, that could be a lot of it, all the time. "Near them" is not necessary near, but millions of KMs away, maybe some light years away, in orbit, to not get crushed or sucked in. Most people don't even see clearly, what this takes, it'd take lots of energy not to fall in, energy to travel fast enough to orbit and have energy to compensate for gravitational friction, people oversimplify because don't know and don't really think about things, the mistakes and tragedies happen.
after viewing, have the urge to again watch Darren Aronofsky film "The Fountain"
Fantastic mix of content and presentation.
I liked the questions too. The _too smart_ children were great, their curiosity and subject insight are very much needed for the future successes of cosmology.
I could stand a little more math/equations. After following neutron star shows on YT, I ache for just a little more depth - but not too much because of math. I was able to pass diff-eq and assorted numeric analysis courses with comprehension. I know asking for a little more _meat_ probably results in a side of beef. Still on my fave and rewatch list.
I've only caught around three of these PI talks and that little boy has posed a subatomic particle question at each of them!
@@TechNedNed, maybe he's a planted actor, a set-up.
@@jamespurcer3730 Hmm. I rather think, given the appropriate influences growing up, many kids could gain his level of subject comprehension.
@@jamespurcer3730 Most likely a child of someone connected to the Institute. Also, he displays some symptoms of high functioning Aspergers Syndrome. Savant behavior for one.
I came for the hair and was not disappointed.
As Einstein once thought (though not aloud, hence no record of this)... 'Hair is at the same time the least important, and the most noticeable thing going on above the neck.'
a lot of neutron activity went into it i imagine. who wants static hair? i like the way she has dressed smartly for the talk, but still manages to give off an air of el professor loco
Professor Trelawney lol
Just knowing she got the same hairdo down low is a cosmic gift.
Had she worn the hijab, I could have focused better.
Thank you Lord that such a humble natural woman exists and can make us spin like pulsators around a beautiful star
Go to 30:30 to hear the lovely sound of all the pulsars is the Terzan 5 cluster. Great stuff.
See at 4:15 why neutron starts are cosmic gifts that keep giving & continue to amaze astronomers.
Victoria Kaspi and her amazing Pulsar Organ!
Fascinating
Is there a measurable effect from the pressure of the beaming radiation upon the other pulsar in a binary? Just wondering.
The Earth is spinning at about 400 meters per second and even at that speed the equator is bulging out- much faster and the planet would come apart at the seams. A Neutron star is spinning at about 45,000 kilometers per second! Nothing on Earth could ever be made to spin that fast! Even a small coin sized piece of titanium would annihilate it self at that speed.
+Ralph Latham
what's your point?
The strong force is a million times stronger then the electromagnetic force.
@@morningmadera What he's saying is that the Neutron Star Hypothesis is just that. A badly thought out and ever changing hypothesis which is totally made up of BS. It is easily torn apart by actual observation and known physics. These guys have been doing so for years: th-cam.com/video/tiPmoFmBnN8/w-d-xo.html
Nice Speech!
57:30 When that 9 year old said "No." And cut her off I was fully jaw dropped and my sister who wasn't even paying attention to my video was like "bruh what" by the attitude you can tell he is a very smart kid 🤣🤣
very animated and entertaining speaker!
I think a great assignment for an engineering student would be to design the structure necessary to support a cubic cm of neutron star material.
Easy the support is a neutron star . 😋
Check out at 30:40 the fascinating symphony from heaven of pulsars music from a stars cluster. See also the beginning of pulsars music topic @26:55.. Great talk!
Very interesting lecture
Gracias.
*A Case against Neutron stars* and the things withheld to general public.
Neutron stars are relatively small objects and exhibit tremendous gravitational energy which implies high matter density and the only matter candidate would be the neutron, reasoning goes, in order to achieve the densities required the neutron to have these necessary properties:
1 Neutrons have a net charge a zero, therefore neutralizing repulsive coulombs Forces.
2 The Neutron also have two quantum state spin which also contributes to the packing concentration. Following the Heisenberg principle!
Both of these properties give the potential for these neutrons to be able to be packed together in the densities required. Now the question becomes, what force drives them to be compacted, the answer given is the force of gravity. Gravity is the ultimate compressive Force which causes the formation of this extraordinary material called *Neutronium*.
*"Houston we have a problem"*
Neutron decay; this works against the formation of Neutronium.
The unstable Neutron would work against achieving the density requirements, so this instability must be neutralized.
Neutrons are known to be unstable, neutrons will decay into its constituents, which are proton and electron + neutrino *(N-> p+e+v)* or using the standard model of quarks, *(ddu--> dud)* which is the propensity of a down quark to flip into an up quark, now we need a mechanism to inhibits this flip from occurring, which would be needed to stabilize Neutronium!
The answer again is gravity.
*The missing Link; The formulation of Quantum Gravity theory*
But due to the fact that we're dealing with a quantum Dynamics, gravity must be explained in terms of quantum mechanical rules, unfortunately *the theory of quantum gravity does not exist!* The introduction into the narrative of *hyperons* particles, does not resolve the issue because they *are also unstable.*
*Chicken and the egg problem in neutron stars*
In order to create the Neutronium you must have the gravitational field, but the gravitational field is generated by the Neutronium. Which came first, a classic conundrum of the chicken and the egg problem.
Considering these facts, you can actually call the Neutron star a hypothetical object, but don't call it real.
I can honestly say that the 'music' at 30:30ish was just beautiful.
Hello I have questions: The atom is the nucleus and the electron.
1-Why does the electron not come out of the atom?
2-Why do not the clouds fall on the ground?
3-Why did not the moon fall on Earth?
4 - What are the components of the fabric of the universe?
5-How did the space-time fabric arise? Please send the five questions to cosmologists
.
The moon is falling. Just like all the planets are falling into the sun. Physics101 will answer all your questions.
The Robert C. Byrd, Green Bank Radio Telescope: The World's Largest Steerable Radio Telescope and the World's Largest Structure named for a Klansman. I am happy Dr. Kaspi omitted his name.
Interesting talk. Very informative.
I think for that last question the speaker should have been forthright and said she didn't know if and how her audience demographic changes with respect to level of technicality - not many people would pay attention to that variable.
Great talk. I wish Dr Kaspi had spoken a bit about Magnetars which are another type of Neutron stars.
I wanna know why a giant neutron can have a magnetic field.
And I wish her better luck with her geeky jokes in the future, or perhaps it was just the audience.
+schitlipz Magnetic fields come from materials churning inside planets or stars. Gravitational pressure is extreme in Pulsars that even that dense of a material has to attain some sort of _liquidish like state_ in there for the friction to occur and generate those formidable magnetic fields.
+A. Randomjack but some sort of charge is responsible for magnetic fields na...
+6chars
I wholeheartedly agree. Magnetars are ULTRA-cool! Back in 2004, the pocket monster, SGR 1806-20, gave the Earth a slap in the face from *_literally_* half way across the galaxy! It blinded orbital x-ray telescopes that weren't even pointed anywhere nears its direction, momentarily lit up the Moon in x-rays like a huge flash bulb and could have been seen visually for a split second from the surface of the Earth.
All that awesome power emerged from an object about the size of an average city, from crack in its surface measuring in centimetres!
Nicholas Hylton awesome. nature is amazing.
TH-cam lead me here. Bravo. Came from TB's "Impossible "Neutron Star" Shatters Theory". Now where's that f**king back button!
A NEUTRON STAR IS SO DENSE THAT IF AN OBJECT WAS DROPPED FROM ONE METER ABOVE THE STAR’S SURFACE, IT WOULD HIT THE SURFACE AT A SPEED OF 7.2 MILLION KM PER HOUR
I meant....you indicated... 2×π×10000. Instead of, 2×π×5000.tks.
The second pulsar sound was really Richard Feynman playing the bongos.
😁😁😁😁😁
This was, by far, my favorite one so far.
That animation at around 43 minutes is mind boggling.
Magnetic field interact that oscillate between zero align and 45 degrees the angular momentum maximum at 45 degrees but when shifted to 90 degress peculiarly emitting gamma and radio pulses comparable with that of Uranus spin.
4 years after, albeit some of mentioned findings already came to pass, this lecture holds up excellently.
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Victoria,you are the most stunning,smart, beautiful woman I have ever seen!!
I wonder on what basis it is calculated that neutron stars reach so small radius during their shrinkage , because , according to simple calculations most of rotating stars , since conserving the original angular momentum, would reach a much higher radius at which centrifugal forces could balance gravitational ones thus avoiding any further shrinkage. Have seen several examples of calculations confirming the above.
Starting at 44:05 You got me, there. How does the magnetic field from the one pulsar eclipse the other one? I thought magnetic fields don't bend light. (?)
Bryan Carter they do bend light
www.quora.com/Can-a-magnet-bend-light
Correction please(min 39:21): the moon changes its orbital distance from earth due to the loss of energy in the tide on earth and this is Newtonian. Thus it is not true that Newtonian mechanics predicts constant distance for ever.
Just a thought from a yokel in the sticks... If Pulsar B disappeared (and you think it may reappear) then surely there must be Binaries with one pulsar suddenly becoming a double pulsar? That is given the relativistic precession mechanism.
Is there an upper speed limit for the rotational speed of a pulsar in terms of centrifugal forces? I.e. a speed at which centrifugal forces would shred it given its density and its diameter of 10km. Or is this "shredding" speed limit beyond the speed of light?
I like it every about Univerce about plantes have waters
replied
We are interested in vela star the expansion and contraction mechanism the change in magneticfield acting as heart pumping mass energy .
what's the difference between Binary pulsar and double Pulsar?
I think it's pushing it to say that the artist's impression is an accurate depiction of a neutron star; for one thing you wouldn't expect to see a few discrete magnetic field lines would you?
Not unless they were filled with plasma.
So dense too!
Can anybody tell me if it is possible to estimate the size of a star in its main sequence according to its rotating speed as a neutron star ?
This is a great talk. I've always been curious, though, can any one tell me how is the magnetic field generated in a neutron star?
Synchrotron radiation is the main contributor (due to plasma), as far as I can remember... this was a question done by a teacher to me in a final course seminar I gave a couple of months ago... Plus, never forget charges moving always produce magnetic fields. It might be now obvious to you these objects have both of them
CoolJL
A neutron star would have no charge. The secret is that they're not pure neutrons.
Isn't it from the extreme density?
Sorry, mis read your question
Perimeter Institute for Theoretical Physics
How would you determine the density and mass of a neutron star that is 250 light years away?
This are very elaborate calculations that can 't be had in one sentence , but available to the willing .
She is so awsome
Music of gravity waves ceases at blackhole formation after merger of Neutron star?
Please teach camera people to dwell on chalkboards so on line viewers can gaze at the equations while listening, LIKE THE AUDIENCE! The incessant stream of facial shots is not appropriate unless these are soap operas. This has an aspect of excluding segments of society from getting the full benefit of otherwise fabulous lectures. Export the full experience to online viewers. That's the whole point, right?
Tim Elsen
... keep camera on chalkboard or projector...
Yes, I agree; that seems to be a universal annoyance.
So, to compensate, I backspace the video 15 seconds or so, then press pause so I can contemplate the lecturer’s material and sometimes capture a screenshot.
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If we were in attendance at the lecture hall, we could take the necessary time to view the PowerPoint or chalkboard. I'd like to do the same on line without hitting pause.
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Is that Feynman on the Cosmic Bongo at 28:18?
wowwie-zowwie !! Starting at 30:39 she plays the "music" of some of the pulsars in a particular ("globular") cluster of stars, and they are actually, unexpectedly, HARMONIC. I wonder: is there a reason for this ??
Whoever put together the "song" got to choose the order of the notes. With such a vast array of random frequencies to choose from, it shouldn't be too difficult to find 2 or 3 frequencies that sound nice together, and group them such.
We should send a space craft that can accelerate very close to the speed of light and send it to the nearest blackhole and wait 2000+ yrs to see the image up close 😀
Good day dear Veronica..... Noticed in your lecture... What is the speed on the surface of a millisecond pulsar?...ie. in the equation.... V = 2xpixR = 2×π1000... But, is not the R = 5000m? Since, D of Neutron star = 10km & R = 5km.- tks.