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Uploaded 02-12-19

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The universe is big, really, really big. Although according to a new paper, it may literally be infinitely smaller than we previously thought.

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Hosted by Matt O'Dowd
Written by Matt O'Dowd
Graphics by Leonardo Scholzer and Adriano Leal
Directed by: Andrew Kornhaber
Executive Producers: Eric Brown and Andrew Kornhaber

End Credits Music by J.R.S. Schattenberg: https://www.youtube.com/channel/UCRl6-nb4iOnsij-vnpAjp0Q

Every time you walk out the door, light from the Big Bang strikes your face, enters your eyes. This is the cosmic microwave background radiation - the left-over heat-glow from the very early universe. We can’t see this microwave light with our eyes, but we can catch it with even a simple radio antenna. As soon as we became aware of its existence we’ve been feverishly building better and better devices to collect it. Why? Because it encodes so many secrets. And within this light, a group of scientists have just found evidence of the limits of space. A clue that our universe may be actually be finite in size. Today on Space Time Journal Club we’ll delve into the Nature Astronomy paper that just reported this: Planck evidence for a closed Universe and a possible crisis for cosmology by Eleonora Di Valentino, Alessandro Melchiorri, and Joe Silk.

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Uploaded 18-04-18

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Now that gravitational waves are definitely a thing, it’s time to think about some of the crazy things we can figure out with them. In some cases we’re going to need a gravitational wave observatory - in fact, we've already built one.

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Previous Episode:
The Physics of Life (ft. It's Okay to be Smart and PBS Eons!)
https://www.youtube.com/watch?v=GcfLZSL7YGw&t=25s

We are at the cusp of a golden age of gravitational wave astronomy. We’ve already talked about the Laser Interferometer Gravitational Wave Observatory–LIGO, and the first discovery of gravitational waves here. Those videos came out almost two years ago. A lot has happened since then. First, an update on LIGO. In its two and a half years of operation, LIGO has observed five certain black hole–black hole mergers. These events have been consistently surprising.

Reinterpreting Low Frequency LIGO/Virgo Events as Magnified Stellar-Mass Black Holes at Cosmological Distances
Broadhurst, Diego and Smoot (2018)
https://arxiv.org/abs/1802.05273

On Stellar-Mass Black Hole Mergers in AGN Disks Detectable with LIGO
McKernan et al. 2018
https://arxiv.org/abs/1702.07818

Stars as Resonant Absorbers of Gravitational Waves
McKernan, Ford, Kocsis and Haiman
https://arxiv.org/abs/1405.1414

Hosted by Matt O'Dowd
Written by Drew Rosen and Matt O'Dowd
Produced by Rusty Ward
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Uploaded 10-08-20

The second in our two event series about Theories of Everything! Watch the first one: https://www.youtube.com/watch?v=_izocEgArtQ

Please subscribe to Brian Keating's YouTube Channel to watch one-on-one interviews with the guest speakers and more: https://www.youtube.com/DrBrianKeating

Existing Theories of Everything have not yet produced experimental evidence that solves the fundamental challenges facing physics. That lack of progress has opened up a sea of controversy, from disagreements about the very necessity of TOEs, to questioning the cost/benefit of mega-billion dollar particle accelerators in search of them, to the emergence of competing TOEs from physicists outside of the academic community. In this 90 minute chat we dive into the existential questions around TOEs.

Special thanks to Brian Keating, Lee Smolin, Sabine Hossenfelder, and Eric Weinstein for helping us create this great event.

Our Guests' Work:

Sabine Hossenfelder
YouTube Channel: https://www.youtube.com/SabineHossenfelder
Lost in Math: How Beauty Led Physics Astray: https://www.basicbooks.com/titles/sabine-hossenfelder/lost-in-math/9781541646766/

Eric Weinstein
The Portal Podcast: https://ericweinstein.org/
The Portal Wiki: https://projects.theportal.wiki/

Lee Smolin
Einstein's Unfinished Revolution: The Search for What Lies Beyond the Quantum
https://www.amazon.com/Einsteins-Unfinished-Revolution-Search-Quantum/dp/1594206198/ref=sr_1_1?dchild=1&keywords=lee+smolin&qid=1597087375&s=books&sr=1-1
Time Reborn: From the Crisis in Physics to the Future of the Universe
https://www.amazon.com/Time-Reborn-Lee-Smolin/dp/0544245598/ref=sr_1_2?dchild=1&keywords=lee+smolin&qid=1597087375&s=books&sr=1-2
Three Roads to Quantum Gravity
https://www.amazon.com/gp/product/0465094546/ref=dbs_a_def_rwt_hsch_vapi_tpbk_p1_i3
The Trouble With Physics: The Rise of String Theory, The Fall of a Science, and What Comes Next
https://www.amazon.com/gp/product/061891868X/ref=dbs_a_def_rwt_hsch_vapi_tpbk_p1_i2
The Life of the Cosmos
https://www.amazon.com/gp/product/0195126645/ref=dbs_a_def_rwt_hsch_vapi_tpbk_p1_i4

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Uploaded 21-10-19

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Invitation to Time Travelers: https://www.youtube.com/post/UgzeIA0O00-bVioxU4t4AaABCQ

Time travel stories are cool because both the past and future are somehow more interesting that the present and because everyone wants a redo. But so far it appears we’re doomed to live consumed by regret in the eternal, boring present. Time marches on, inexorably and only forward. Or so we thought until Einstein came along. His special and general theories of relativity changed the way we think about time forever, and believe it or not, their raw equations permit time travel. They even tell us how to do it. So let’s review the possibilities, and decide how possible they really are.

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Uploaded 31-03-20

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Normal maps are useless inside black holes. At the event horizon - the ultimate point of no return as you approach a black hole - time and space themselves change their character. We need new coordinate systems to trace paths into the black hole interior. But the maps we draw using those coordinates reveal something unexpected - they don’t simply end inside the black hole, but continue beyond. In these maps, black holes become wormholes, and new universes lie on the other side.

Hosted by Matt O'Dowd
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Uploaded 10-10-18

Physics seems to be telling us that it’s possible to simulate the entire universe on a computer smaller than the universe.

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Previous Episode:
How to Detect Extra Dimensions
https://www.youtube.com/watch?v=3HYw6vPR9qU

Hosted by Matt O'Dowd
Written by Matt O'Dowd
Graphics by Luke Maroldi
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I’m not saying the universe is a simulation. I mean it might be – I’m just not saying it. And perhaps it doesn’t make any difference. Even if this is the prime, the original physical universe, rather than somewhere deep in a simulation nest, we can STILL think of our universe’s underlying mechanics as computation. Imagine a universe in which the most elementary components are stripped of all properties besides some binary notion of existence or non-existence. Like, if the tiniest chunks of spacetime, or chunks of quantum fields, or elements in the abstract space of quantum-mechanical states can either be full or empty. These elements interact with their neighbors by a simple set of rules, leading to oscillations, elementary particles, atoms, and ultimately to all of the emergent laws of physics, physical structure, and ultimately the universe.


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سلطان الخليفي

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