Neutron Stars: Where Extreme Gravity Meets Extreme Matter – Katerina Chatziioannou -…

What are neutron stars made of? How are these objects truly unlike any other matter in the universe? Join us to learn these answers and more with the esteemed Professor Katerina Chatziioannou! Timestamps below:

00:00 Announcements
03:05 Intro to Neutron Stars Presentation
03:40 Neutron Stars Presentation
37:00 Neutron Stars Q&A
37:19 When do we expect the next neutron star merger to occur?
38:47 Is it possible for neutron stars to collide and form a black hole?
40:19 While merging, can black holes eject radiation or matter?
42:36 How are black hole mergers different from when neutron stars merge?
44:33 Can neutron stars cool enough to support life on their surfaces?
46:17 Dead time setting up Q&A Panel
52:21 Intro to Q&A Panel
58:00 What discoveries will the James Webb Space Telescope make?
1:00:32 Do we know how many neutron stars are in the universe relative to black holes?
1:02:33 How was the Event Horizon Telescope focused to ensure it was looking at Sgr A*?
1:05:05 Have we witnessed a new star “ignite”?
1:08:40 Can we detect black holes that lack an accretion disk? How?
1:11:09 Are the cores of stars related to a Bose-Einstein Condensate?
1:14:04 Is there a “maximum mass” for a neutron star?
1:16:32 Does a planet merging with a star generate gravitational waves?
1:19:49 Can we use the Event Horizon Telescope to image a neutron star?
1:21:38 Concluding Remarks

Neutron stars are matter’s last stand in the battle against total collapse under the overwhelming force of gravity. With masses comparable to that of our Sun yet smaller in size than the island of Manhattan, neutron star interiors drive matter to extreme conditions with densities exceeding those found in the nuclei of atoms. These extreme conditions can only be described with our most advanced physics theories: Quantum Chromodynamics and General Relativity. At the same time, neutron stars are at the heart of some of the most energetic astronomical events we observe, from supernova explosions to collisions of neutron stars and black holes. I will describe what neutron stars are, what we know about them, and what we do not know but attempt to learn using collisions of neutron stars and black holes observed with gravitational waves.

Dr. Katerina Chatziioannou is an Assistant Professor of Physics at Caltech, where she focuses her research on black holes, neutron stars, and extreme tests of gravity. She uses observations of gravitational waves, ripples in spacetime itself, to study the properties of black holes and neutron stars. Dr. Chatziioannou is particularly interested in the properties of neutron stars and the states of matter in their extremely dense cores.

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