Public Lecture-The Dark Universe Through Einstein's Lens
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- เผยแพร่เมื่อ 27 ส.ค. 2024
- Lecture Date: Tuesday, July 23rd. Debbie Bard, a staff scientist at SLAC and a member of the Kavli Institute for Particle Astrophysics and Cosmology, delivered the July 23 SLAC Public Lecture, "The Dark Universe Through Einstein's Lens."
Bard's talk explains the phenomenon known as gravitational lensing and how astrophysicists use it to explore the 95 percent of the universe that remains unseen: dark matter and dark energy.
One of the most surprising predictions made by Einstein's theory of relativity is that light doesn't travel through the universe in a straight line. The gravitational field of massive objects will deflect the path of light traveling past, giving some very dramatic effects. We see multiple images of quasars, galaxies smeared into arcs and circles and magnified images of the most distant objects in the universe. This explains how gravitational lensing was first observed and discusses how scientists use this phenomenon to study everything from exoplanets to dark matter to the structure of the universe and the mysterious dark energy.
Bard began her career at SLAC as a particle physicist and has since graduated to studying galaxy clusters -- moving from exploring the most minuscule bits of matter in the universe to the largest structures known. Currently she's developing new ways to mine data from the future Large Synoptic Survey Telescope (LSST) for information. Discovering how to push gravitational lensing to its limits is one promising focus of her research. Lecturer: Debbie Bard, SLAC/Kavli
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Excellent lecture! ! I'm 36 and never been to school, and I understand very complex physics! So interesting !!! Thanks
It is nice that the pictures include full captions showing where it came from. Search on those letters and numbers and you should be able to find the original on the NASA site, or find a copy that also gives the official file ID which you can look up on the official site. That will give multiple resolutions for downloading, and detailed information about the image.
You might also screen-grab it from the video and use tineye image search.
Equal and opposite, the beginning of the Universe, is the Hyperboloid of Aether Field. The Hyperboloid goes both directions. There's a vortex heading the opposite direction, also. Now the Magnetic Torus is growing, the Universe is alive. Expanding into a Magnetic Torus, that gives Magnitude to the Universe. The Universe is expanding into the other half of the Universal Magnitude Magnetic Torus. The other half is Counterspace. Where atoms closest positrons, have the highest energy near the positrons nucleus. Forces of nature are opposite in Counterspace.
The 4 forces of nature, in Space.
1) Capacitance.
2) Resistance.
3) Permeability.
4) Permittivity.
These would be opposite in Counterspace.
We understand gravity so well that we had to invent 95-97% of the universe (dark matter and dark energy) to explain why our galaxy doesn't fly apart as it spins. Maybe we need a new theory instead! Its also more likely that photons have their own magnetic field and are deflected by interactions with other magnetic fields (like the suns) and so appear to bend around massive objects.
The electromagnetic interaction is mediated by the constant exchange of photons from one charged object to another. The magnetic field is really just a classical approximation to the photon-exchange picture. In a moving reference frame, a magnetic field appears instead as a combination of a magnetic field and an electric field, so electric and magnetic fields are made of the same "stuff" (photons). Electrostatic and magnetic fields involve the exchange of "virtual" photons.
and its not like we donot know gravity well so we are inventing something like DM and DE, its like we know gravity so well that we can see other things in this universe with the help of gravity!
1) Both DM and DE allegedly are gravimetric in nature, one allegedly causes the universe to expand the other stops galaxies allegedly from flying apart.
2) Of course photons have a magnetic field they are electromagnetic radiation.
speed of light is constant, only the space bends, and the light embedded in it, theres no acceleration of speed of light if it bends !! enjoy!!
Bro, Radiations and field are two different things, radiation is the emission of energy, its the emission of oscillating electric and magnetic fields. Photons do not have intrinsic or in simple words its own magnetic field, if it was that if we increases the intensity of light and the frequency, our magnetic compass should have deflected, the spaceships thrown into the space are exposed to a large amount of solar heat and light, the machines mechanisms would have failed altogether!
and DARK MATTER, the fact we dont know what it is can be present in other dimensions as well , there are seven more dimensions of space possible, and as gravity is only the curvature of space and time, the curved space of one dimension may be interact with other dimensions space!
Are the colors in the pictures of the various galaxies you displayed actually the real colors of the galaxies, or are they subjective artifacts of whoever rendered the images from the original data?
Light has no mass and is not affected by the mass of an object. Space is bent by the mass of an object and light traversing through that space is indirectly affected.
they are real! also the colours helps in seeing the light doppler effect, and seeing the universe expanding!
what you said is right but you are not understanding the fact that gravity curves space and time and light is embedded and in that fabric as so are we , wouldnt it be a beautiful coincidence that the amount bending due to (if you are right) the magnetic field of the sun is just equal to the curvature of space and time!
A static magnetic field is not made of photons EM waves are quantized in packets called photons.
is lensing light effect on the speed of light?
and the biggest contradiction to your idea is the fact that when we move away from the center of the galaxies the gravitational field should decrease exponentially because of the visible mass, that means the centripetal force and hence the velocity should decrease as we move away but it remains constant for quite a good range! Now massive particles are interacting with more dense center with gravitation or magnetic interaction , you have your answer I guess, ITS NOT ONLY GRAVITATIONAL LENSING!
Watch, The Slow Mo Guys, "Light at 10 trillion FPS".
- Compression of Aether field perturbations.
- bounces off the coaxial circuit of the Inertial plane, FLASH, so called photons.
- Rarefaction.
Repeat ...
Think very carefully, The moon is also the same case,because it is too small and near to the curved space of earth it rotates about earth and because the sun has a much larger curved space and time, the earth is effected by it, and the earth revolves around the sun and so moon does because its already revolving around earth Same goes with the sun and our galaxy, our sun gets effected by the massive and dense galactic center but the whole galaxy drift apart from each other due to "dark energy".
I understand the theory but disagree with it. Orbits are spiral, the sun drags the solar system behind it as it orbits the galaxy. If gravity is not a force and merely curved space time ,I don't see how it would be possible.
Gravity is not a force. It's an acceleration. Space and shadows do not have properties.
Galxies are far away from each other, at a distance of lightyears billions of them, so gravity cannot be acting to such distances so and also if there was gravity they should have attracted but they are repelling out, expansion and that too accelerating so there has to be some kind of energy that has to provide that and that is dark energy. And dark energy and dark matter has nothing do with each other.
Visualize it as two separate diagrams one in which moon is inside curved space of earth and in second diagram change the earth to sun and the moon to earth and then assemble the whole system and in the end place galactic center at sun and the change the earth to our solar system :) it may clear your doubt :)
well I am happy somebody is interested to talk :)
They should not call it Dark matter Dark Gravity is a better name because there is no proof that what cause the extra gravity is matter it's only an assumption.
It will be odd as when if they discover the "dark matter", they will have to say hurayyy we discovered dark gravity, discovered dark matter sounds fine!
1. Dark energy has nothing do with gravity, its only a possible reason why universe is expanding and why the expansion is accelerating.
2. YOUR IDEA THAT PHOTON MIGHT HAVE MAGNETIC FIELD: it cant be because if it was like that the light we get from sun would also have curved because of magnetism and it would have been an impossible thing that it reached us ! So, no photons donot have intrinsicmagnetic field.
all this provided there "are photons" :P
"Photons do not have intrinsic or in simple words its own magnetic field,"
....photons are the magnetic field.
Photons are not particles. Photons are flashes from the infinite capacitance of the coaxial circuit of the Inertial plane.
could dark matter be the spirit world?
Every UFO story that I look into seems to have a logical explanation which casts doubts on it's validity. Yet Near Death Experiences are very hard to discount. Very few NDE's talk about Mars but I think one did which maintained that there is life on mars but that it's invisible. Perhaps ordinary matter has very high mass making it good for a foundation and for maintaining vast distances between stars while dark matter is both incredibly strong yet incredibly low mass. This would allow beings and objects made from it to pass from one star to another. There would then be an intermediary from of matter called dark matter 1 used to connect dark matter 2 with ordinary matter.
Why? I don't think I'm ranting. I am speculating wildly. I'll admit that. It's better than doing crank
Do we know enough about Dark matter that we are sure it doesn't interact with itself at all? I've heard that it seems not to interact with itself. Perhaps that's caused by it's incredibly low mass. A dark matter building would not be interacting with itself because it's stationary. Dark matter beings would have a seemingly arbitrary behavior.
The religious fanatics will surely call it that
No.