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Paradoxically, the most promising prospects for moving matter around faster than light may be to put a metaphorical brick wall in its way. New efforts in quantum tunneling – both theory and experiment – show that superluminal motion may be possible, while still managing to avoid the paradox of superluminal signaling.Paradoxically, the most promising prospects for moving matter around faster than light may be to put a metaphorical brick wall in its way. New efforts in quantum tunneling – both theory and experiment – show that superluminal motion may be possible, while still managing to avoid the paradox of superluminal signaling.

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Watch our original Quantum Tunneling episode here:
https://youtu.be/-IfmgyXs7z8

Relativistic Tunneling Paper
https://iopscience.iop.org/article/10.1088/1367-2630/abb515/pdf

Nature Paper
https://www.nature.com/articles/s41586-020-2490-7?proof=t

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What happens if you cut a bar magnetic in half? We get two magnets, each with their own North and South poles. But what happens if you keep on cutting, into fourths and eighths and sixteenths and so on? Will we ever get to a single pole? I’ll spoil the answer for you: we don’t know! But the idea of magnetic monopoles remains one of physics’ most tantalizing maybes.

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Today I’m going to explain why you’re not falling through your chair right now using one simple fact, and one object. The fact is that all electrons are the same as each other, and the object is a structurally critical item of my clothing. There’s a chance this episode could get very weird.

Electrons DO NOT Spin
https://youtu.be/pWlk1gLkF2Y

Spin Renderings by the Incredible Jason Hise
http://entropygames.net/

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We’ve traveled to lots of weird places on this show – from the interiors of black holes to the time before the big bang. But today I want to take you on a journey to what has got to be the weirdest place in the modern universe – a place where matter exists in states I bet you’ve never heard of. Today we take a journey to the center of the neutron star.

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How do you see the unseeable – how do you explore the inescapable? Our cleverest astronomers have figured out ways to catch light that skims the very edge of black holes. Let’s find out what they learned.

A few weeks ago a story made the rounds of pop-sci media proclaiming that for the first time light had been detected from behind a black hole. The reports were about a paper that claimed to have seen X-rays that came not from inside but from the back end black hole. This is obviously cool stuff – I mean, really anything new with black holes captures the public attention. But this result is cool in ways most people aren’t aware. And it brought us closer to a goal that I’ve been personally striving towards for years – trying to understand what happens in the vicinity of the largest black holes in the universe. I thought it would be worth doing a space time journal club on the Nature paper by Wilkins, Gallo, Costantini, Brandt & Blandford so I get to talk about my favorite subject in the universe.

Nature Paper
https://www.nature.com/articles/s41586-021-03667-0

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#space #blackholes #astrophysics

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The universe is going to end. But of all the possible ends of the universe vacuum decay would have to be the most thorough – because it could totally rewrite the laws of physics. Today I hope to help you understand exactly how terrified you should be.

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In the Many Worlds interpretation of quantum mechanics, the universal wavefunction is the reality, encompassing all possible histories and futures and all exist. But we are only sensitive to a slice of the wavefunction corresponding to our “world”, and due to the superposition principle our world can happily do its thing unperturbed by other parts of the wavefunction – other “ripples,” or worlds. And while it may seem like it would be physically impossible to have any connection between worlds, it may turn out to be entirely possible to communicate between them.

More About Steven Weinberg:
https://www.scientificamerican.com/article/learning-to-live-in-steven-weinbergs-pointless-universe/

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A new white dwarf has been discovered (poetically named: ZTF J1901+1458) that’s doing some stuff that no white dwarf should ever be able to do. In fact, it has multiple properties that are so extreme that it almost certainly did NOT form in the way that we thought all white dwarfs formed. This one peculiar point of faint light may change our understanding of not just white dwarfs, but of all cosmology.

Professor Dave Explains: Debunking the Electric Universe
https://youtu.be/T9q-v4lBGuw

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How far can you follow a compass needle? As far as the north magnetic pole, where the needle starts spinning wildly? Compass needles align with magnetic field lines, and on the precise spot of magnetic north, those field lines are vertical. So just tilt your compass 90 degrees and you can continue your journey – either down to the molten iron dynamo surrounding the Earth’s core, or up. But up to where? The answer – to everywhere – and today, that’s where we’re going to go.

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Many Worlds interpretation of quantum mechanics proposes that every time a quantum event gets decided, the universe splits so that every possible outcome really does occur. But where exactly are those worlds, and can we ever see them?

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

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