The Temporal Mirror: Reinterpreting the Einstein-Rosen Bridge

<v Speaker 1>Welcome to the Core side Quantum Physics Podcast, an exploration
<v Speaker 1>of the fundamental structure of reality, where quantum laws govern matter, energy,
<v Speaker 1>and information. Here, uncertainty is a feature, not a flaw,
<v Speaker 1>and understanding begins at the smallest scales.
<v Speaker 2>Hello, and welcome back to another exploration. I am genuinely
<v Speaker 2>thrilled you are here today because we are tackling a
<v Speaker 2>subject that sits right at the intersection of our wildest
<v Speaker 2>science fiction dreams and well the hardest, coldest realities of physics.
<v Speaker 3>It really does.
<v Speaker 2>We're looking at a stack of research today that I'll
<v Speaker 2>be honest, it feels a bit like a roller coaster.
<v Speaker 3>That's a perfect description.
<v Speaker 2>It takes you up to this highest peak of excitement
<v Speaker 2>and then it just drops you into a free fall
<v Speaker 2>of disappointment. But then, and this is the weird part,
<v Speaker 2>it loops you around into something completely unexpected and frankly
<v Speaker 2>much more profound.
<v Speaker 3>It really is a journey of good news, bad news,
<v Speaker 3>and then weird news. We're dealing with the topic that
<v Speaker 3>everyone thinks they understand because of you know, Hollywood. Oh absolutely,
<v Speaker 3>but the actual physics behind it has just undergone a
<v Speaker 3>massive shakeup. We're looking at a paper published just recently
<v Speaker 3>in January twenty twenty six by Enrique gustain Yaga and
<v Speaker 3>his colleagues, and it forces us to rethink the structure
<v Speaker 3>of the universe itself.
<v Speaker 2>We are talking about wormholes, wormholes, the cosmic shortcut, the
<v Speaker 2>Einstein Rosenbridge. You know the image You fold a piece
<v Speaker 2>of paper in half, plunch pencil through it, and suddenly
<v Speaker 2>you can jump from Earth to the Andromeda Galaxy in
<v Speaker 2>time for lunch. Right, It's the backbone of interstellar contact
<v Speaker 2>star treks. I mean, basically, if you need to move
<v Speaker 2>a plot faster than the speed of light, you use
<v Speaker 2>a wormhole exactly.
<v Speaker 3>It's the ultimate narrative device. It solves the biggest problem
<v Speaker 3>in space travel, which is that space is just, you know,
<v Speaker 3>annoyingly impossibly big. Yes, we want a subway system for
<v Speaker 3>the stars. We do.
<v Speaker 2>But and here comes the record scratch moment. There. This
<v Speaker 2>new research suggests that this subway system is permanently closed.
<v Speaker 3>Or maybe that it was never a subway system to
<v Speaker 3>begin with. Right, that's the hard truth we have to
<v Speaker 3>lead with. According to this new analysis, in the general
<v Speaker 3>classical and quantum gravity, the traversible wormhole the kind Matthew
<v Speaker 3>McConaughey fly as a spaceship through it. It likely does not exist.
<v Speaker 3>It can't exist.
<v Speaker 2>I have to say, when I first read the headline,
<v Speaker 2>I felt a genuine pang of loss.
<v Speaker 3>I get that.
<v Speaker 2>There's something so hopeful about the idea of a wormhole.
<v Speaker 2>It makes the universe feel accessible. Losing that, yeah, it
<v Speaker 2>feels like we're being trapped in our own backyard.
<v Speaker 3>I completely get that. It is a disappointment if you
<v Speaker 3>look at the universe as a place to conquer or
<v Speaker 3>travel through. But I want to pivot your perspective of
<v Speaker 3>it because what Gustin Yaga is proposing is that while
<v Speaker 3>we lose the shortcut, we gain an answer to a
<v Speaker 3>much more bigger question, which is the origin of everything.
<v Speaker 2>Oh.
<v Speaker 3>This research suggests that these structures aren't tunnels for spaceships.
<v Speaker 3>They are mirrors for time, and these mirrors might be
<v Speaker 3>the reason we're here at all. They might prove that
<v Speaker 3>our Big Bang wasn't the beginning but a bounce.
<v Speaker 2>Okay, mirrors for time and bouncing universes. That is a
<v Speaker 2>lot to unpack. So our mission today is to figure
<v Speaker 2>out how we got from sci fi tunnel to this
<v Speaker 2>new theory. We need to understand why the old wormhole
<v Speaker 2>idea failed, what this mirror actually is, and why it
<v Speaker 2>implies we might be living inside a black hole right now.
<v Speaker 3>And we're going to see how this attempts to solve
<v Speaker 3>the biggest headache in physics, the absolute war between gravity
<v Speaker 3>and quantum mechanics.
<v Speaker 2>So let's rewind. Let's go back to the source. Most
<v Speaker 2>people here Einstein Rosenbridge, and they assume Einstein sat down
<v Speaker 2>in nineteen thirty five trying to figure out how to
<v Speaker 2>travel faster.
<v Speaker 3>Than light, which is completely wrong. We have to contextualize
<v Speaker 3>where Einstein was in nineteen thirty five. He wasn't thinking
<v Speaker 3>about spaceship. He was thinking about particles. Specifically, he was frustrated,
<v Speaker 3>frustrated with what with singularities in his theory of general relativity.
<v Speaker 3>If you crunch matter down enough, you get a point
<v Speaker 3>of infinite density singularity.
<v Speaker 2>And that's where the math breaks.
<v Speaker 3>The math breaks, it turns into nonsense. Einstein hated that
<v Speaker 3>he felt that nature shouldn't have divide by zero errors.
<v Speaker 2>So a black hole is essentially a divide by zero
<v Speaker 2>error in.
<v Speaker 3>The universe in the math of relativity. Yes, at the
<v Speaker 3>very center. At the same time, you had this emerging
<v Speaker 3>field of quantum mechanics dealing with electrons and protons, treating
<v Speaker 3>them as point particle infinite density dots, and Einstein and
<v Speaker 3>his colleague Nathan Rosen wanted to get rid of these points.
<v Speaker 3>They wanted a geometry that was smooth everywhere, no sharp edges,
<v Speaker 3>no infinities.
<v Speaker 2>So they weren't building a tunnel. They were trying to
<v Speaker 2>build a better electron exactly.
<v Speaker 3>That is the part history often forgets. They propose a
<v Speaker 3>model where a particle isn't a solid dot, but a
<v Speaker 3>tiny bridge connecting two sheets of space time.
<v Speaker 2>Two sheets.
<v Speaker 3>Yeah, imagine two parallel pieces of paper. The particle in
<v Speaker 3>their model was a little tube connecting a point on
<v Speaker 3>the top sheet to a point on the bottom sheet.
<v Speaker 3>To them, the Einstein rosenbrids was a model for an
<v Speaker 3>elementary particle.
<v Speaker 2>So it was a way to have mass in charge
<v Speaker 2>without having a singularity at the center.
<v Speaker 3>Precisely, it smeared out the pointiness of the particle into
<v Speaker 3>a smooth geometric structure that is wild.
<v Speaker 2>So the original wormhole was microscopic.
<v Speaker 3>It was intended to be. Yes, It was a mathematical hack,
<v Speaker 3>a really clever one, to save physics from infinities. The
<v Speaker 3>idea that you could scale it up and drive a
<v Speaker 3>car through it. That didn't come until decades later.
<v Speaker 2>So how did we get from math hack for an
<v Speaker 2>electron to let's fly a ship through it?
<v Speaker 3>That shift happens much later in the late nineteen eighties,
<v Speaker 3>physicists like Kip Thorn.
<v Speaker 2>The guy who consulted on Interstellar the very.
<v Speaker 3>Same he and others started asking the what if questions.
<v Speaker 3>They took the Einstein Rosen math and said, okay, forget particles,
<v Speaker 3>so what if this structure was macroscopic? What if it
<v Speaker 3>was huge? Could we send a signal through it? Could
<v Speaker 3>we send a person?
<v Speaker 2>And that is when the sci fi dream was.
<v Speaker 3>Born, right, But almost immediately the math starts screaming no.
<v Speaker 3>And this brings us to what we can call the
<v Speaker 3>pinching problem. This is the part that kills the sci
<v Speaker 3>fi dream. So we really need to understand it.
<v Speaker 2>Okay, lay it on me. Why can't I fly my
<v Speaker 2>spaceship through the bridge?
<v Speaker 3>Because the bridge is dynamic. It's not a static hallway.
<v Speaker 3>It's not like the Lincoln Tunnel.
<v Speaker 2>It's not just a hole in space.
<v Speaker 3>No, it's a structure made of space, time and space
<v Speaker 3>time is governed by gravity, and gravity, you know, is
<v Speaker 3>an attractive force. It wants to pull things together.
<v Speaker 2>So it wants to close.
<v Speaker 3>It wants to collapse, and inside this bridge, the gravitational
<v Speaker 3>forces are immense. The math shows that it collapses basically instantaneously.
<v Speaker 2>Define instantaneously, like I open the door and it shuts
<v Speaker 2>in one second.
<v Speaker 3>Faster, much much faster. It shuts faster than the speed
<v Speaker 3>of light.
<v Speaker 2>Wait, hold on, I thought nothing move faster than light.
<v Speaker 2>You can't just say faster than light and get away
<v Speaker 2>with it. That's like rule number one.
<v Speaker 3>Good catch, And you're right. Nothing travels through space faster
<v Speaker 3>than light. But space itself space can do whatever it wants.
<v Speaker 2>Ah the loophole.
<v Speaker 3>The loophole, Space can expand or contract at any speed.
<v Speaker 3>It's the fabric, not the things on the fabric. So
<v Speaker 3>imagine you open this wormhole. You're standing at the entrance.
<v Speaker 3>You see the light from the other side, let's say
<v Speaker 3>the Andromeda galaxy.
<v Speaker 2>Okay, I see the pretty spiral galaxy on the other side.
<v Speaker 3>You take one step forward. But the tunnel, the space
<v Speaker 3>time of the bridge itself is collapsing so fast that
<v Speaker 3>the ceiling and floor meet in the middle and pinch off. Okay,
<v Speaker 3>and this happens before the light that was at the
<v Speaker 3>threshold can even reach the middle of the tunnel, so.
<v Speaker 2>You can't even get halfway through before it's gone.
<v Speaker 3>You can't even get started. You literally get crushed into
<v Speaker 3>a singularity before you can cross. The bridge disconnects itself
<v Speaker 3>from the universe before it can be traversed.
<v Speaker 2>So it's a trap. It's not a bridge. It's a
<v Speaker 2>cosmic mouse trap.
<v Speaker 3>In its natural state. Yes, it's designed to fail unless
<v Speaker 3>unless you prop it open.
<v Speaker 2>And this is where the sci fi writers say activate
<v Speaker 2>the shields or use the dark matter or some other technobabble.
<v Speaker 3>They usually say exotic matter. And this is a real
<v Speaker 3>term in physics, but it is often misused. To keep
<v Speaker 3>that throat open against the clushing weight of gravity, you
<v Speaker 3>need something that pushes back. You need anti gravity.
<v Speaker 2>Anti gravity. I mean that sounds pretty exotic to me.
<v Speaker 3>Effectively, Yeah, you need matter that has negative energy density.
<v Speaker 2>I am going to stop you there. Negative energy. That
<v Speaker 2>sounds like a mood, not a physics TERMO. How energy
<v Speaker 2>is its heat, it's light, it's motion. How can you
<v Speaker 2>have less than zero energy?
<v Speaker 3>It is a brain bender? I mean it's one of
<v Speaker 3>the weirder concepts out there. Think of empty space as
<v Speaker 3>having a baseline energy, the vacuum energy. We usually just
<v Speaker 3>call that level zero, okay, the floor right. Positive energy
<v Speaker 3>is anything above that floor, a planet, a star, a battery.
<v Speaker 2>You.
<v Speaker 3>Negative energy would be a region where the energy is
<v Speaker 3>lower than the vacuum state. It's a dip in the floor.
<v Speaker 2>Is that even possible or is this just a number
<v Speaker 2>on a spreadsheet that makes an equation work.
<v Speaker 3>Well, we have seen hints of it. We've created tiny,
<v Speaker 3>tiny amounts of it in labs using something called the
<v Speaker 3>Casimir effect. Basically, you squeeze two metal plates so close
<v Speaker 3>together that you squeeze out some of the vacuum fluctuations
<v Speaker 3>between them.
<v Speaker 2>So you create a little patch of less than.
<v Speaker 3>Nothing, a little patch of less than nothing that creates
<v Speaker 3>a tiny attractive force. But to hold a wormhole open,
<v Speaker 3>the human sized one, you would need Jupiter sized amounts
<v Speaker 3>of this stuff.
<v Speaker 2>And we don't have a Jupiter sized bucket of negative
<v Speaker 2>energy lying around.
<v Speaker 3>We haven't found a single ounce of it in nature
<v Speaker 3>on that scale. It is purely conjectural. It's a theoretical requirement,
<v Speaker 3>but there's no evidence that exists in the quantities needed.
<v Speaker 2>So the final verdict is no scaffolding.
<v Speaker 3>No scaffolding without the negative energy, the bridge snap shut instantly.
<v Speaker 3>The subway is closed permanently.
<v Speaker 2>Okay, so the door is slam shut, the subway is
<v Speaker 2>out of order. And usually this is where we would
<v Speaker 2>pack up and go home. Stories over. But Gastanga and
<v Speaker 2>his team looked at this broken bridge and said, wait,
<v Speaker 2>we're looking at this all wrong.
<v Speaker 3>This is the pivot. This is the brilliant part. They said,
<v Speaker 3>if general relativity forbids travel, maybe the bridge isn't for travel.
<v Speaker 3>Maybe it's serving a different function in the universe. It's
<v Speaker 3>not a bug, it's a feature.
<v Speaker 2>And this brings us to the mirror concept.
<v Speaker 3>Yes, they stopped looking at the bridge as a connection
<v Speaker 3>between place A and place B. They started looking at
<v Speaker 3>it as a connection between universe A and well.
<v Speaker 2>A reflection, the reflection in time.
<v Speaker 3>Correct. And to get this we have to talk about symmetry.
<v Speaker 3>Physics at its absolute core is just obsessed with symmetry assessed.
<v Speaker 3>How what do you mean, Well, look at the fundamental laws,
<v Speaker 3>Newton's laws, Einstein's relativity, even Schrodinger's equation. In quantum mechanics,
<v Speaker 3>if you look at the raw equations, none of them
<v Speaker 3>have a preferred direction for time.
<v Speaker 2>What do you mean? Time definitely has a direction. I
<v Speaker 2>am older than I was ten minutes ago. My coffee
<v Speaker 2>got cold, it didn't spontaneously get hot again.
<v Speaker 3>That is your macroscopic experience talking. And you're right. In
<v Speaker 3>our big, messy world, time has an arrow. We call
<v Speaker 3>that entropy.
<v Speaker 2>Right. The universe gets more disordered.
<v Speaker 3>Over time, Exactly, things get messier. You break an egg,
<v Speaker 3>it scrambles, it never unscrambles itself and goes back into
<v Speaker 3>the shell. That's the arrow of time we experience, right.
<v Speaker 3>But zoom in, weigh in. Look at a single atom
<v Speaker 3>mumping into another atom, a single billiard ball collision. If
<v Speaker 3>I recorded that on video and played it backward, would
<v Speaker 3>do you know?
<v Speaker 2>I know, I guess not. It would just look like
<v Speaker 2>another bound, so that the physics would.
<v Speaker 3>Look the same exactly At the microscopic level. The fundamental
<v Speaker 3>laws of physics are time symmetric. They work equally well
<v Speaker 3>forward and backward. There is no arrow of time in
<v Speaker 3>the fundamental equations themselves. The arrow only emerges when you
<v Speaker 3>have billions and billions of particles interacting.
<v Speaker 2>Okay, I accept that for atoms, but how does that
<v Speaker 2>apply to the wormhole, this giant structure.
<v Speaker 3>Gusta Yuga's team argues that the Einstein Rosenbridge is the
<v Speaker 3>place where this fundamental symmetry becomes physically relevant on a
<v Speaker 3>large scale. It's a structure that connects two regions where
<v Speaker 3>time flows in opposite directions.
<v Speaker 2>Okay, hold on, time flows backward. I hear those words,
<v Speaker 2>but my brain rejects them. What does that actually mean?
<v Speaker 2>Are people walking backward? Is the rain falling up into
<v Speaker 2>the clouds.
<v Speaker 3>It's not about movies playing in reverse. That's a common misconception.
<v Speaker 3>It's more fundamental. Think of it as a balance sheet
<v Speaker 3>for the universe. To make the math work, to keep
<v Speaker 3>the energies balanced, and the quantum symmetry is intact, you
<v Speaker 3>need a counterbalance.
<v Speaker 2>A yin and the yang, a yin and a yang.
<v Speaker 3>The wormhole isn't a tunnel to a new location. It
<v Speaker 3>is the hinge point. It's the joint. On one side
<v Speaker 3>of the hymn, you have our universe where entropy increases
<v Speaker 3>and what we call time moves forward. Okay, our side
<v Speaker 3>on the other side of the hinge. Mathematically, there has
<v Speaker 3>to be a complementary state, a state where from our perspective,
<v Speaker 3>entropy is decreasing, where time flows in the reverse direction
<v Speaker 3>relative to us.
<v Speaker 2>Is a mirror universe in a temporal sense.
<v Speaker 3>Yes, it is the necessary other half of the equation.
<v Speaker 3>It's not a place you can visit. It's the other
<v Speaker 3>side of the coin that makes the coin exist.
<v Speaker 2>And we don't see it because we're stuck on our
<v Speaker 2>side of the coin.
<v Speaker 3>Exactly. We only see the forward half because we live
<v Speaker 3>in a big, high entrpy world. But near a black hole,
<v Speaker 3>near that extreme gravity, where the bridge exists, the structure
<v Speaker 3>becomes relevant. The bridge is what stitches the two arrows
<v Speaker 3>of time together into one complete system.
<v Speaker 2>So the wormhole is the scene.
<v Speaker 3>Yes, it is the scene between the forward time reality
<v Speaker 3>and the backward time reality. Without both, the physics is incomplete.
<v Speaker 2>That is deeply abstract. But I want to ground this
<v Speaker 2>because the research says this actually solves a massive practical
<v Speaker 2>problem in physics, the black hole information paradox.
<v Speaker 3>Oh, this is the big one. This is the forty
<v Speaker 3>year long war in theoretical physics. This is the issue
<v Speaker 3>that kept Stephen Hawking up at night.
<v Speaker 2>Set the scene for us. Why is this a paradox.
<v Speaker 2>What's the problem.
<v Speaker 3>Okay, So in the nineteen seventies, Stephen Hawking did this
<v Speaker 3>incredible calculation. He combined quantum mechanics in general relativity near
<v Speaker 3>a black hole's edge, and he realized that black holes
<v Speaker 3>aren't perfectly black. They radiate Hawking radiation Hawking radiation. They
<v Speaker 3>glow with a faint heat, and because they're radiating energy,
<v Speaker 3>they're losing mass. Over trillions upon trillions of years, they
<v Speaker 3>lose all their mass, and eventually they evaporate. They disappear
<v Speaker 3>completely in a final poof of radiation.
<v Speaker 2>Okay, so the trash can of the universe eventually empties itself.
<v Speaker 2>Why is that a problem?
<v Speaker 3>Because of what was inside the trash can. Let's say
<v Speaker 3>I write a diary, all my deepest secrets, the complete
<v Speaker 3>information about my life, and I throw it into a.
<v Speaker 2>Black hole, very secure disposal.
<v Speaker 3>The most secure. But according to a fundamental rule of
<v Speaker 3>quantum mechanics, information is never lost. The universe is unitary.
<v Speaker 3>Unitary it means that if you had a super supercomputer
<v Speaker 3>and you could track every single photon and particle in
<v Speaker 3>the universe, you should, in principle, be able to rewind
<v Speaker 3>the clock and reconstruct my diary from the ashes, like putting.
<v Speaker 2>A shredded document back together. If you have all the
<v Speaker 2>pieces exactly.
<v Speaker 3>The information is scrambled, but it's not gone. But Hawking's
<v Speaker 3>math showed that when the black hole evaporates, the radiation
<v Speaker 3>that comes out is random. It's thermal gibberish. It contains
<v Speaker 3>no information about my diary. The information is gone, erased,
<v Speaker 3>deleted from the universe.
<v Speaker 2>And quantum mechanics says, you can't do that.
<v Speaker 3>Quantum mechanics screams illegal move yeah, but relativity says, sorry,
<v Speaker 3>the black hole is gone. This is the paradox, one
<v Speaker 3>of them, one of our two best theories of reality
<v Speaker 3>has to be wrong.
<v Speaker 2>And physicists have been trying to fix this for decades
<v Speaker 2>with all sorts.
<v Speaker 3>Of complicated, bizarre ideas. But here's how the time mirror
<v Speaker 3>fixes this. It's just so elegant. It redefines the event horizon.
<v Speaker 3>We usually think of the event horizon as the point
<v Speaker 3>of no return, a cliff edge. You fall off, you
<v Speaker 3>get crushed, your information is lost in the hole forever, right,
<v Speaker 3>But if the bridge at the center is a time mirror,
<v Speaker 3>the event horizon isn't a cliff It is the entryway
<v Speaker 3>to the bridge. The information your diary crosses the horizon,
<v Speaker 3>but instead of being destroyed in a singularity, it passes
<v Speaker 3>through to the mirror side, where time runs backward.
<v Speaker 2>Wait, so the information doesn't vanish, It just exits stage
<v Speaker 2>left into the past.
<v Speaker 3>It continues to exist and evolve, but in the reverse
<v Speaker 3>timeframe it flows into the other side of the symmetry.
<v Speaker 3>This means the information is conserved. It's still in the
<v Speaker 3>total universe, the bi universe system, you could say.
<v Speaker 2>So quantum mechanics is happy.
<v Speaker 3>Quant mechanics is happy, but it has left our observable
<v Speaker 3>region of forward flowing time. So general relativity is also happy.
<v Speaker 3>The paradox just dissolves.
<v Speaker 2>That is incredibly elegant. Feels like a magic trick. Is
<v Speaker 2>the rabbit in the hat nos in the other hat?
<v Speaker 2>You just need to know there was a second hat.
<v Speaker 3>That is often how physics advances. You realize you were
<v Speaker 3>only looking at half the system. The solution was there
<v Speaker 3>all along, hidden in the symmetry of the equations.
<v Speaker 2>Okay, so we fixed black holes. That's a Nobel prize
<v Speaker 2>right there. But the source material goes way bigger. It
<v Speaker 2>takes this mirror idea and applies it to the whole enchilada,
<v Speaker 2>the Big Bang.
<v Speaker 3>This is where we move from interesting physics to existential crisis.
<v Speaker 2>I'm a ready bring on the crisis.
<v Speaker 3>If the universe loves symmetry, and if black holes act
<v Speaker 3>as these time bridges, then what does that say about
<v Speaker 3>the moment everything began? The ultimate singularity?
<v Speaker 2>The standard story is fourteen billion years ago, there was
<v Speaker 2>a point of infinite density the Big Bang. Time starts
<v Speaker 2>at zero. Everything explodes out of that singularity.
<v Speaker 3>Right another singularity, another divide by zero error that physicists
<v Speaker 3>have never been comfortable with. But this theory suggests what
<v Speaker 3>if the Bang wasn't the beginning? What if it was
<v Speaker 3>a bounce. Imagine a universe before ours apparent universe. Maybe
<v Speaker 3>it expands for a while, but eventually gravity wins. That
<v Speaker 3>universe stops expanding and starts collapsing. It crunches down all
<v Speaker 3>the matter, all the stars, everything squeezes into a tiny
<v Speaker 3>hot day.
<v Speaker 2>The big crunch, And normally that is where we think
<v Speaker 2>it all ends, a final singularity.
<v Speaker 3>And if this bridge mechanism is real, it doesn't end.
<v Speaker 3>It doesn't hid an infinity. It hits that maximum density
<v Speaker 3>crosses the symmetry point that the mirror and reverses, that
<v Speaker 3>collapse turns into an expansion. Time reflects, the implosion becomes
<v Speaker 3>an explosion.
<v Speaker 2>And that explosion is our Big Bang.
<v Speaker 3>Precisely, we are the exhale of a previous universe's inhale.
<v Speaker 2>That is a beautiful image. It makes the universe feel
<v Speaker 2>like a lung breathing and breathing out potentially forever.
<v Speaker 3>It removes the need for a creation moment out of nothing,
<v Speaker 3>which has always been a philosophical sticking point. It implies
<v Speaker 3>an eternal chain of universes, each one giving birth to
<v Speaker 3>the next.
<v Speaker 2>But there's just a specific detail in the report that
<v Speaker 2>made my hair stand up. It says, and I'm quoting,
<v Speaker 2>our universe might be the interior of a black hole
<v Speaker 2>formed in another parent cosmos.
<v Speaker 3>Yes, this is the nesting doll theory of the cosmos.
<v Speaker 2>Explain that how can we be inside a black hole?
<v Speaker 2>I look up the night sky and I the stars.
<v Speaker 2>I don't see a ceiling.
<v Speaker 3>Think about the geometry from both sides. From the outside.
<v Speaker 3>In the parent universe, a giant star collapses, It forms
<v Speaker 3>a black hole. It creates an event horizon. Matter falls in.
<v Speaker 3>But what does that matter see from the inside. As
<v Speaker 3>it crosses the bridge, the math says, it experiences a
<v Speaker 3>moment of infinite density that immediately blossoms into a rapidly
<v Speaker 3>expanding space that.
<v Speaker 2>Sounds exactly like our expanding universe viewed from the inside.
<v Speaker 3>It is mathematically identical. The interior of a black hole
<v Speaker 3>in one universe can be the big bang of a
<v Speaker 3>new universe, the event horizon of that parent black hole.
<v Speaker 3>From our perspective, that's the boundary of our observable universe,
<v Speaker 3>the cosmic horizon beyond which we can't see.
<v Speaker 2>So we are living in a bubble, a bubble blown
<v Speaker 2>by a collapsing star in a bigger reality that we
<v Speaker 2>can never access.
<v Speaker 3>That is the staggering implication.
<v Speaker 2>Yes, which begs the question if we came from a
<v Speaker 2>parent universe, did anything survive the trip? Is there any
<v Speaker 2>luggage from the old world?
<v Speaker 3>That is the billion dollars question. If the bounce is messy,
<v Speaker 3>if it's not a perfect, clean reset, then some things
<v Speaker 3>might get through. Some structures might be robust enough.
<v Speaker 2>To survive, like what, for instance.
<v Speaker 3>Well Source Material speculates about primordial black holes. These wouldn't
<v Speaker 3>be black holes formed from stars in our universe. These
<v Speaker 3>would be small, super dense black holes formed in the
<v Speaker 3>parent universe that managed to survive the transition.
<v Speaker 2>They rode the bounce.
<v Speaker 3>They rode the bounce, And here is where it connects
<v Speaker 3>to another one of the biggest mysteries in all of science.
<v Speaker 2>Dark matter.
<v Speaker 3>Dark matter. We have this stuff. We know it's there
<v Speaker 3>because of its gravity. It makes up eighty five percent
<v Speaker 3>of the matter in the universe. We can't see it,
<v Speaker 3>we don't know what it is.
<v Speaker 2>We have been hunting for a new kind of dark
<v Speaker 2>matter particle for forty years and we've found zilch, nothing exactly.
<v Speaker 3>The experiments keep coming up empty. So some physicists are
<v Speaker 3>starting to ask, what if we're looking for the wrong thing.
<v Speaker 3>What if dark matter isn't a new particle at all?
<v Speaker 3>What if it's just a swarm of these ancient prime
<v Speaker 3>mordial black holes.
<v Speaker 2>Well, so the dark matter holding our galaxy together right now,
<v Speaker 2>it might be the ghosts of the previous universe.
<v Speaker 3>It fits the profile perfectly. They would be invisible because
<v Speaker 3>they're black holes. They would have gravity, a lot of it,
<v Speaker 3>and they would be everywhere scattered by the Big Bang.
<v Speaker 3>It is a stunning thought that the gravity keeping you
<v Speaker 3>in your chair might be generated in part by relics
<v Speaker 3>from before the Big Bang even happened.
<v Speaker 2>That is I don't even have a word for that,
<v Speaker 2>but I have to play the skeptic here. This sounds amazing,
<v Speaker 2>It sounds poetic, mirrors, balances, ghosts from another universe. But
<v Speaker 2>is it just math on a whiteboard? Is there any
<v Speaker 2>actual proof? Can we test this?
<v Speaker 3>I am so glad you asked that, because a theory
<v Speaker 3>without evidence is just fantasy. And this paper, this is
<v Speaker 3>the kicker. It claims to have a smoking.
<v Speaker 2>Gun, and it's in the cosmic microwave background.
<v Speaker 3>The cosmic microwave background, the CMB. This is the afterglow
<v Speaker 3>of the Big Bang. It's the oldest light in the universe,
<v Speaker 3>a baby picture of the cosmos when it was just
<v Speaker 3>three hundred and eighty thousand years old.
<v Speaker 2>And usually we are told it is incredibly uniform. It
<v Speaker 2>is the same temperature everywhere, with tiny, tiny fluctuations.
<v Speaker 3>Roughly yes, to the naked eye, a map of the
<v Speaker 3>CMB looks like TV static, random noise. But for about
<v Speaker 3>twenty years now, cosmologists have been staring at this static
<v Speaker 3>and noticing something weird, something that shouldn't be there and
<v Speaker 3>anomally a very specific one. We call it the parity asymmetry.
<v Speaker 2>Break that down. What is parody asymmetry?
<v Speaker 3>Okay, imagine you're looking at that map of TV static
<v Speaker 3>the CMB. You expect it to be totally random, But
<v Speaker 3>if you look closely at the patterns of hot and
<v Speaker 3>cold spots, you realize the patterns on the left side
<v Speaker 3>of the sky are slightly different than the patterns on
<v Speaker 3>the right.
<v Speaker 2>It's lopsided.
<v Speaker 3>It's lopsided. It's as if the universe has a preferred direction.
<v Speaker 3>One of its mirror images is slightly different from the other.
<v Speaker 2>And the standard Big Bang theory says that shouldn't happen.
<v Speaker 3>The standard model of cosmology is built on the idea
<v Speaker 3>that the universe is isotropic, the same in all directions.
<v Speaker 3>It says, this slopsidedness has to be a fluke, a
<v Speaker 3>statistical one in a million accident, like flipping a coin
<v Speaker 3>a thousand times and getting six hundred heads. It's possible,
<v Speaker 3>but it's really really suspicious, and.
<v Speaker 2>It's just a fluke. Is never a satisfying answer in
<v Speaker 2>science exactly.
<v Speaker 3>Physicists hate relying on luck. But here is the massive
<v Speaker 3>victory for the mirror theory. If you plug in the
<v Speaker 3>math of the time mirror, if you include the influence
<v Speaker 3>of that backward time universe on our own during the
<v Speaker 3>Big Bang, the lopsidedness isn't a fluke, It is a prediction.
<v Speaker 2>Wait, really, the theory actually predicts the static should be lopsided.
<v Speaker 3>Yes, the interaction between our universe and the mirror state
<v Speaker 3>during the bounce naturally creates exactly this kind of asymmetry.
<v Speaker 3>It breaks the perfect mirror symmetry in a very specific, predictable.
<v Speaker 2>Way, so that weird blemish on the baby picture of
<v Speaker 2>the universe. That isn't a mistake in the photo. That's
<v Speaker 2>a fingerprint.
<v Speaker 3>It is the fingerprint of the reflection. It is evidence
<v Speaker 3>that the other half of the system, the mirror universe,
<v Speaker 3>exists and had an influence on us. It takes a
<v Speaker 3>bug in the old theory and turns it into a
<v Speaker 3>core feature of the new one.
<v Speaker 2>That gives me goosebumps because it anchors all this wild
<v Speaker 2>speculation living in black holes time flowing backward. It anchors
<v Speaker 2>it to something we can actually point to, tell us
<v Speaker 2>go bad and measure.
<v Speaker 3>That is what makes this paper so exciting. It is
<v Speaker 3>not just philosophy. It's testable physics, and the first test
<v Speaker 3>seems to be a pass.
<v Speaker 2>So let's wrap this up. We started this investigation feeling
<v Speaker 2>kind of bad about the death of the wormhole. We
<v Speaker 2>lost our warp drive. We are stuck taking the slow
<v Speaker 2>boat to Alpha Centauri.
<v Speaker 3>We are, and I don't want to minimize that. For
<v Speaker 3>space travel enthusiasts, it is a blow, no question.
<v Speaker 2>But look at what we gained in exchange. It's an
<v Speaker 2>incredible trade.
<v Speaker 3>We traded a transportation tunnel for a mirror into the
<v Speaker 3>fundamental nature of time. We traded a simple shortcut for
<v Speaker 3>an eternal cycle of birth and rebirth.
<v Speaker 2>We gained a view of a universe that doesn't just
<v Speaker 2>start an end, but bounces. A universe where time is
<v Speaker 2>a two way street at the deepest level, even if
<v Speaker 2>we can only down one side of the road.
<v Speaker 3>And it connects everything. It suggests the laws governing a
<v Speaker 3>single particle are the same ones that govern the entire cosmos.
<v Speaker 3>It suggests that Einstein's relativity and quantum mechanics aren't enemies.
<v Speaker 3>They are two sides of that mirror.
<v Speaker 2>I have one final thought I want to throw at you,
<v Speaker 2>a provocative thought to send our listeners.
<v Speaker 3>Home with Let's hear it.
<v Speaker 2>If we are possibly living inside the interior of a
<v Speaker 2>black hole from a parent universe, and our universe is full.
<v Speaker 3>Of black holes, I see where you're going with this.
<v Speaker 2>Does that mean every black hole in our sky contains
<v Speaker 2>a baby universe inside it?
<v Speaker 3>That is the logical conclusion of the theory is are.
<v Speaker 2>We living in a nesting doll of realities? Is universes
<v Speaker 2>all the way down?
<v Speaker 3>It is entirely possible. Every time a massive star collapses
<v Speaker 3>in our galaxy, it might be the big bang for
<v Speaker 3>a new reality that will never know we exist, and we,
<v Speaker 3>in turn might just be the offspring of a single
<v Speaker 3>collapsing object in a universe we can never see.
<v Speaker 2>That makes the night sky look a lot different. Those
<v Speaker 2>are just dark spots up there. There might be seeds.
<v Speaker 3>They might be seeds. I like that a cosmic garden.
<v Speaker 2>Well, on that mind bending note, we are going to
<v Speaker 2>close this investigation. Thank you for going on this journey
<v Speaker 2>with us through the wormhole, into the mirror and out
<v Speaker 2>the other side.
<v Speaker 3>It was a pleasure, a real trip.
<v Speaker 2>Go outside tonight, look up, think about the bounce. We
<v Speaker 2>will catch you next time.