Black Holes, Spaghettification, and Time Travel - Nils Deppe - 03/24/2023

Can we abuse gravity to achieve time travel or to visit distant galaxies? What is preventing us from turning science fiction into science fact? Join us for a 30-minute lecture on the counterintuitive side of gravitational physics, followed by a panel Q&A consisting of several astrophysicists to answer your questions about space science. Timestamps below:

00:00 Announcements
04:26 Intro to Black Holes Presentation
05:40 Black Holes Presentation
33:02 Q&A for Black Holes Presentation
33:25 "What is the minimum mass of a black hole?"
38:55 "Does time travel violate 2nd law of thermodynamics?"
40:37 "What happens to things orbiting a black hole?"
42:00 Intermission
48:55 Q&A Panel Introductions
53:00 "What was the negative mass stuff in the Casimir effect?"
54:00 "How do you use Lagrangian mechanics to model a 3-body system?"
56:30 "Do white holes exist?"
57:38 "Which films portray black holes correctly/incorrectly?"
1:05:02 "What is happening with the black hole in War of the Worlds?"
1:06:18 "Can you split a black hole in two?"
1:08:00 "How did the panelists specialize in their subdisciplines?"
1:12:46 "What happens when neutron stars collide?"
1:19:19 "Do black holes dissipate when close to other black holes?"
1:20:45 "Why don't black holes suck everything in?"
1:24:26 "How does time slow down near a black hole?"
1:31:19 "Why study the early universe using radio telescopes?"
1:33:13 "In Interstellar, why is Dr. Mann's scene physically wrong?"
1:36:00 "What books describe black holes physics well for laypeople?"
1:40:25 "Could aliens on Proxima Centauri hear our radio signals?"
1:46:04 "What are the differences between supermassive and stellar black holes?"
1:48:17 "Do we have to travel to the destination to build a wormhole?"
1:49:13 "How can we isolate black hole mergers from each other?"
1:55:38 "How do we see black holes with light?"
2:01:33 Concluding Remarks
Speaker: Dr. Nils Deppe
Abstract:
Gravity on Earth is quite boring: it makes apples fall. However, near a black hole things get really strange. Time slows down and everything becomes spaghetti. Can we abuse gravity to achieve time travel or to visit distant galaxies? What is preventing us from turning science fiction into science fact? Come learn about the wild and whacky side of gravity and how black holes are too weird even for Hollywood sci-fi movies like Interstellar.

Dr. Nils Deppe is a postdoctoral fellow in theoretical astrophysics at Caltech and will be starting as an assistant professor of physics at Cornell this summer. He uses computer simulations to study black hole and neutron star collisions, providing predictions for what scientists using LIGO and other instruments should observe. Outside of work he enjoys hiking, backpacking, music, hanging out with his cat, brewing hard cider, and playing Mario Kart with his partner.

Видео Black Holes, Spaghettification, and Time Travel - Nils Deppe - 03/24/2023 канала Caltech Astro