Matter vs. Gravity: Listening to Colliding Black Holes and Neutron Stars - Katerina Chatziioannou
ฝัง
- เผยแพร่เมื่อ 10 ก.พ. 2025
- Our universe is shaped by the struggle of forces between matter and the attraction of gravity that brings matter together. In the case of neutron stars, matter puts up the ultimate defense, as gravity crushes matter down to densities that exceed those of atomic nuclei. Such neutron stars pack more mass than our Sun down to a size no bigger than Los Angeles. At even further extremes, gravity will lead to the total demise of matter, collapsing everything into a black hole. Yet, at the same time, gravity also provides the means to study such extreme objects as neutron stars and black holes: gravitational waves, "ripples" in space-time that are emitted when neutron stars and black holes collide while traveling at a fraction of the speed of light. Katerina Chatziioannou, assistant professor of physics and William H. Hurt Scholar, describes how researchers track collisions of neutron stars and black holes with gravitational waves, and what we are learning about the universe's most extreme objects.
For more information about Professor Chatziioannou’s research, visit: kchatziioannou...
The full title of this lecture is "Matter vs. Gravity: Listening to Colliding Black Holes and Neutron Stars with Gravitational Waves."
About the Series:
Since 1922, The Earnest C. Watson Lecture Series has brought Caltech's most innovative scientific research to the public. The series is named for Earnest C. Watson, a professor of physics at Caltech from 1919 until 1959. Spotlighting a small selection of the pioneering research Caltech's faculty is currently conducting, the Watson Lectures are geared toward a general audience, as part of the Institute's ongoing commitment to benefiting the local community through education and outreach.
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What a great educator! She has a gift for clearly describing, and illustrating very difficult concepts. Thanks Katerina!
Very clear and understandable presentation with great visuals and simulations.
Excellent lecture!
23:07 Singularity is another word for they don't know. R=0 virtual infinity artifacting. Finite system that evaporates. (Hawking radiation ) Nice talk. I can't wait to see them integrate gravitational wave detection with particle accelerator technology, beam line. Or a linked array to triangulate where the waves originated at.
55:02 Planckian limit. Degeneracy and wrapping and packing. Time distortion factors. Hawking radiation/evaporation and the end of a black holes life. Censorship says R=0 gets destroyed by light as it ramps up in evaporation and then stops. Showing a lower bound on white holes. The universe as a natural cutoff regime or limit for white hole.
Thank you for sharing. Keep up the good work.
There is a linked array 2 in the US and one in italy
Is there an explanation for why gravitational waves travel with the speed of light?
Gravitational Waves have the same physical existence status as orbitals on quantum theory of atoms and molecules .They are mathematical approximations solutions for quite complex equations.Perhaps useful as the the concept of orbitals are for quantum chemistry It is a first order LINEAR approximation for Einstein NON linear equations . By the way , Einstein theory only says that given a DEFINITE distribution of matter and energy in a given region of the space-time , there is an special intrinsically curved reference system defined by the Geodesic system of coordinates associated to A WELL DEFINED METRIC STRUCTURE that can not be removed by coordinate changes since it has non trivial mathematical object called the Ricci tensor (so non trivial curvature!) connected to the distribution of the energy momentum tensor (The famous Einstein Equations) . Everything else as black holes , gravitational waves as physical entities , space-time singularities , etc... are merely speculative (even if at a higher mathematical level ). To prove what I am saying , just consider a non vanishing cosmological constant on Einstein equations . Everything exotic in GR loose sense .Even the interpretation of Gravitational Interaction is lost!.
Consider this: You're given two spheres which both have a golden surface and their wights are identical. However, one is composed of pure gold with anir space inside and the other is light metal (aluminum) also with an air space inside. Q: How can one easily TELL THEM APART (without doing any other experiments on them)? ANSWER: (Roll them down an inclined plane, The one made of pure gold will ROLL MORE SLOWLY -- and the plhysical principle is the ANGULAR MOMENTUM--- the same thing that causes an ffigure skater to speed up when she brings in her arms that were extended from her body --- to end in a lovely pirouette and a bow, Thus one might say that evey large star than exhausts its nuclear fuel will no longer be be to support itself and so it collapses or (as it were)
"brings in its arms" to spin even faster-as most neutron stars do spin in frictionless space after being formed, The "CRAB NEBULA" (rsult of a supernova seen by Japanese, Chinese astronomers & American Indians in the year 1054). The Hubble Telescope shiws a neutron star was left behind, still spinning faster than an Indianapolis race care engine at high RPM!'(So praise God...from whom all bkeswing flow--- the Bible tells me so----> ISAIAH 51:6 pairs with PSALM 102:25, AMOS 8:9?
PS: That neutron star inide the CRAB NEBULA soins at a rate of one revolution EVERY 33 MILLISECONDS (or that point on its equator is moving FOUR MILLION MILES PER HOUR ! ! !
LOOK..... I've spotted a nutter! 👀
Just think: a teaspoonfull of solid neutrons (the materiel of a neutron star) would weigh about = toa 167 Aircraft cariers stacked on top of each other! DAMN!
Almost the same yo m0m!
@6:45 subject introduction.
Would be a good talk if I believed in gravitational waves.
💫💥💫💥💫💥💫💥
MIND VISUALS OVER EXPERIMENTAL OBSERVATIONAL VERIFICATIONS 5:06 5:09 5:14
I WAS AT BARC WHILE THE DETECTION OCCURED IN 2015 22.11.2024 8:19
WHY ARE YOU SCREAMING AT US? DO YOU NEED TO TAKE YOUR MEDS?
? Could it be multiple Neutron Stars colliding with each other and filling the gap between Neutron Stars and Black Holes.
Relearning! Feel slightly young..
Pasadena's having a really bad day 😞
16 km. What kilometers? Local or from our perspective? You know you can’t just disregard relativity.
🙏🙏🙏🙏👍
"all neutron stars are the same"? .. the difference between magnetars, pulsars and passive neutron stars was not explained
ВСЕОБЩАЯ СТРУКТУРА ВСЕЛЕННОЙ И СПИРАЛЬ ПАРЬЕВА ПОГУГЛИТЕ
99.99999999% of her message is irrelevant to 99.9999999999999999% of people alive 😮😮.
Shocking neglect of real priority 😮