Is our universe just one of many? In this profound exploration of modern cosmology, we look at why the \.
Category: cosmology
What If The Universe Is Math?
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In his essay “The Unreasonable Effectiveness of Mathematics”, the physicist Eugine Wigner said that “the enormous usefulness of mathematics in the natural sciences is something bordering on the mysterious”. This statement was inspired by the observation that so many aspects of the physical world seem to be describable and predictable by mathematical equations to incredible precision especially as quantum phenomena. But quantum phenomena have no subjective qualities and have questionable physicality. They seem to be completely describable by only numbers, and their behavior precisely defined by equations. In a sense, the quantum world is made of math. So does that mean the universe is made of math too? If you believe the Mathematical Universe Hypothesis then yes. And so are you.
#space #universe #maths.
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Does Time Cause Gravity?
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We know that gravity must cause clocks to run slow on the basis of logical consistency. And we know that gravity DOES cause clocks to run slow based on many brilliant experiments. But I never explained WHY or HOW gravity causes the flow of time to slow down. And I’m not going to explain it now — because in a sense it’s not true. Gravity does NOT warp the flow of time. It’s the other way around — the warping of time causes gravity.
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https://mailchi.mp/1a6eb8f2717d/space… by Matt O’Dowd Written by Matt O’Dowd Graphics by Leonardo Scholzer, Yago Ballarini, Pedro Osinski, Adriano Leal & Stephanie Faria GFX Visualizations: Katherine Kornei Directed by Andrew Kornhaber Assistant Producer: Setare Gholipour Executive Producers: Eric Brown & Andrew Kornhaber Sabine Hossenfelder’s episode “Do we travel through time at the speed of light?” • Do we travel through time at the speed of… Sound of Pulsars https://www.parkes.atnf.csiro.au/peop… End Credits Music by J.R.S. Schattenberg:
/ @julesschattenberg Special Thanks to Our Patreon Supporters Big Bang Sponsors Rick DeWitt Sandy Wu Matthew Miller Sean Maddox Brodie Rao Scott Gray Ahmad Jodeh Radu Negulescu Alexander Tamas Morgan Hough Juan Benet Fabrice Eap Mark Rosenthal David Nicklas Quasar Sponsor Hank S Christina Oegren Mark Heising Vinnie Falco Hypernova Sponsors william bryan Paul Stehr-Green Leo Emerson muOn Marketing Russell Pope Ben Delo L. Wayne Ausbrooks Nicholas Newlin Mark Matthew Bosko Drew Hart Jason Finn Антон Кочков Alec S-L Julian Tyacke John R. Slavik Mathew Danton Spivey Donal Botkin John Pollock Edmund Fokschaner Joseph Salomone Matthew O’Connor chuck zegar Jordan Young m0nk John Hofmann Timothy McCulloch Gamma Ray Burst Supporters Ben Campbell Lawrence Tholl, DVM Faraz Khan Almog Cohen Alex Edwards Nick Ádám Kettinger Sylvain Leduc Anthony Kahng MD3 Endre Pech Daniel Jennings Cameron Sampson Pratik Mukherjee Geoffrey Clarion Nate Adrian Posor Darren Duncan Lily kawaii Russ Creech Jeremy Reed Magistrala Хемус [Kybrit] Derek Davis Eric Webster Steven Sartore DrJYou David Johnston J. King Michael Barton Christopher Barron James Ramsey Justin Jermyn Mr T Andrew Mann Jeremiah Johnson fieldsa eleanory Peter Mertz Kevin O’Connell Richard Deighton Isaac Suttell Devon Rosenthal Oliver Flanagan Dawn M Fink Bleys Goodson Darryl J Lyle Robert Walter Bruce B Ismael Montecel Andrew Richmond Simon Oliphant Mirik Gogri David Hughes Christopher Hartnett Mark Daniel Cohen Brandon Lattin Yannick Weyns Nickolas Andrew Freeman Shane Calimlim Tybie Fitzhugh Robert Ilardi Astaurus Eric Kiebler Craig Stonaha Martin Skans Michael Conroy Graydon Goss Frederic Simon Tonyface John Robinson A G Kevin Lee Adrian Hatch Yurii Konovaliuk John Funai Cass Costello Geoffrey Short Bradley Jenkins Kyle Hofer Tim Stephani Luaan AlecZero Cody Malte Ubl King Zeckendorff Nick Virtue Scott Gossett Martin J Lollar Dan Warren Patrick Sutton John Griffith Daniel Lyons DFaulk Kevin Warne Andreas Nautsch Brandon labonte.
Hosted by Matt O’Dowd.
How To Simulate The Universe With DFT
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If you used every particle in the observable universe to do a full quantum simulation, how big would that simulation be? At best a large molecule. That’s how insanely information dense the quantum wavefunction really is. And yet we routinely simulate systems with thousands, even millions of particles. How? By cheating. Using the ultimate compression algorithm: Density Functional Theory (DFT). Let’s learn how to cheat the universe.
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Oxford team achieves advanced quantum squeezing with trapped ion
“The result is more than the creation of a new quantum state. It is a demonstration of a new method for engineering interactions that were previously out of reach,” said Dr. Oana Băzăvan, lead author from the Department of Physics, University of Oxford.
“The fourth-order quadsqueezing interaction was generated more than 100 times faster than expected using conventional approaches. This makes effects that were previously out of reach accessible in practice,” Băzăvan added.
Physicists have long used a trick called “squeezing” to sharpen the fuzzy measurements of the subatomic world. It is why gravitational-wave detectors, like LIGO, can hear black holes colliding across the universe. But for all its utility, ordinary squeezing is a relatively simple, second-order effect.
The Universe might not be flat (and cosmologists are quietly freaking out)
Everything we know about the shape of the Universe could be completely wrong.
This is one of the most fascinating unsolved problems in cosmology, and it almost never gets talked about outside of research papers. It’s called the curvature tension, and it links in to the \.
Do We Have Free Will? with Robert Sapolsky & Neil deGrasse Tyson
Is there a quantum reason we could have free will? Neil deGrasse Tyson and comedian Chuck Nice explore the concept of free will and predetermination with neuroscientist, biologist, and author of Determined: The Science of Life Without Free Will, Robert Sapolsky.
A special thanks from our editors to Robert Sapolsky’s dog.
Could we put an end to the question of whether or not we have free will? Discover “The Hungry Judge Effect” and how little bits of biology affect our actions. We break down a physicist’s perspective of free will, The Big Bang, and chaos theory. Is it enough to just feel like we have free will? Why is it an issue to think you have free will if you don’t?
We discuss the difference between free will in big decisions versus everyday decisions. How do you turn out to be the type of person who chooses vanilla ice cream over strawberry? We explore how quantum physics and virtual particles factor into predetermination. Could quantum randomness change the actions of an atom? How can society best account for a lack of free will? Are people still responsible for their actions?
What would Chuck do if he could do anything he wanted? We also discuss the benefits of a society that acknowledges powers outside of our control and scientific advancements made. How is meritocracy impacted by free will? Plus, can you change if people believe in free will if they have no free will in believing so?
Thanks to our Patrons Pro Handyman, Brad K. Daniels, Starman, Stephen Somers, Nina Kane, Paul Applegate, and David Goldberg for supporting us this week.
DAMPE satellite reveals cosmic rays share spectral break near 15 teravolts
A century after their discovery, cosmic rays—particles of extreme energy originating from the far reaches of the universe—remain a mystery to scientists. The DAMPE (Dark Matter Particle Explorer) space telescope is tackling this phenomenon, particularly investigating the role that dark matter may play in their formation. This international mission, which includes the University of Geneva (UNIGE), has made a major breakthrough by highlighting a universal feature of these particles. The results are published in the journal Nature.
Cosmic rays are the most energetic particles observed in the universe, far surpassing the energies of particles produced by man-made accelerators on Earth. Their exact origin is still under study, and it is believed that they originate from extreme astrophysical phenomena, such as supernovae, black hole jets, or pulsars.
The DAMPE space telescope, launched in December 2015, aims to provide answers regarding the origin and nature of these cosmic rays. This space mission, with the astrophysics group from the Department of Nuclear and Particle Physics (DPNC) at the University of Geneva (UNIGE) being one of its main contributors, has made a crucial breakthrough. Through the analysis of high-precision measurements collected by the telescope, scientists have identified a universal feature in the energy spectra of primary cosmic ray nuclei, ranging from protons to iron.
How do you study something you can never step outside of?
Studying the thing you can never step outside of and look back at is the fundamental problem facing every cosmologist who has ever looked up at the night sky. The Universe is not a laboratory you can peer into from above, it’s the thing you are already inside. The only way to truly test your ideas about how it works is to build a copy of it, run the clock forward from the Big Bang, and see if what emerges matches what your telescopes are actually telling you.
That is exactly what the FLAMINGO project has been doing. And this week, its creators made the results available to the entire world.
An international team of astrophysicists, led by researchers at Leiden University in the Netherlands, has released one of the largest cosmological simulation datasets ever produced. The archive contains more than 2.5 petabytes of data (roughly equivalent to half a million high definition films) and is free to access for researchers anywhere on the planet.
