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Relativity of Spacetime Superpositions Explained · The Quark Side - Quantum Physics Podcast

• 0:01
  Speaker 1: Welcome to the quart Side Quantum Physics Podcast, an exploration
• 0:05
  Speaker 1: of the fundamental structure of reality, where quantum laws govern matter, energy,
• 0:11
  Speaker 1: and information. Here, uncertainty is a feature, not a flaw,
• 0:16
  Speaker 1: and understanding begins at the smallest scales.
• 0:27
  Speaker 2: Imagine if you will, the two most successful rulebooks ever
• 0:31
  Speaker 2: written to describe the machinery of the universe.
• 0:33
  Speaker 3: Right, the absolute foundational texts reality.
• 0:36
  Speaker 2: Yeah, And on one side of the table you have
• 0:38
  Speaker 2: the rulebook for the massive, the truly gargantuan. We're talking
• 0:43
  Speaker 2: about the mechanics of stars burning in the.
• 0:45
  Speaker 3: Dark, the crushing weight of black.
• 0:47
  Speaker 2: Holes exactly, and the continuous, just mind bending expansion of
• 0:51
  Speaker 2: the cosmos. This is Einstein's theory of general relativity, his
• 0:55
  Speaker 2: explanation for gravity, and well, it works flawlessly, really bad.
• 1:00
  Speaker 3: It's remarkably precise.
• 1:01
  Speaker 2: But then you look on the other side of the
• 1:03
  Speaker 2: table and you have the second rule book, and this
• 1:05
  Speaker 2: one governs the impossibly.
• 1:06
  Speaker 3: Tiny, right, the quantum realm.
• 1:08
  Speaker 2: Yeah, it dictates the erratic, completely unpredictable behavior of atoms, molecules,
• 1:14
  Speaker 2: and the fundamental particles that make up literally everything around you.
• 1:17
  Speaker 2: This is quantum mechanics, and just.
• 1:19
  Speaker 3: Like relativity, it also works swallolessly.
• 1:21
  Speaker 2: It does. But here's the problem, and I mean it
• 1:24
  Speaker 2: is a massive one. These two rule books completely contradict
• 1:27
  Speaker 2: each other.
• 1:28
  Speaker 3: They do. It is arguably the most profound and persistent
• 1:32
  Speaker 3: mystery in all of modern science, because if you try
• 1:38
  Speaker 3: to apply the rules of the massive to the microscopic world,
• 1:42
  Speaker 3: the mathematics completely break down.
• 1:44
  Speaker 2: It just stops making sense, exactly.
• 1:46
  Speaker 3: And conversely, if you try to apply the rules of
• 1:48
  Speaker 3: the tiny to say, a black hole, it results in
• 1:52
  Speaker 3: absolute nonsense.
• 1:54
  Speaker 2: Like the equations just start spitting out infinities.
• 1:56
  Speaker 3: Right, yes, exactly. It is as if the universe is
• 2:00
  Speaker 3: playing by two entirely different sets of laws, depending purely
• 2:03
  Speaker 3: on well how closely you look.
• 2:04
  Speaker 2: At it, which brings us to our objective for today.
• 2:07
  Speaker 2: We are exploring a groundbreaking new paper just published in
• 2:10
  Speaker 2: the journal NPJ.
• 2:11
  Speaker 3: Quantum Information is by a really brilliant team of researchers.
• 2:14
  Speaker 2: Yeah from Qshu University, the University of Waterloo and Stockholm University.
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  Speaker 2: It's led by Associate Professor Joshua Fu right, and this
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  Speaker 2: research it targets the ultimate holy grail of modern physics,
• 2:25
  Speaker 2: which is the desperate search for quantum gravity.
• 2:27
  Speaker 3: The theory that would finally unite those two warring rule.
• 2:30
  Speaker 2: Books exactly a single unified theory. But this paper reveals
• 2:35
  Speaker 2: something absolutely staggering. It suggests that we might be completely
• 2:40
  Speaker 2: misinterpreting the very experiments we've been designing for decades to
• 2:43
  Speaker 2: actually find it.
• 2:44
  Speaker 3: It's a really critical moment in physics right now. And
• 2:47
  Speaker 3: I know, concepts like superposition and relativity. You know, they
• 2:50
  Speaker 3: often sound like they belong in a dense graduate level lecture.
• 2:54
  Speaker 2: Oh for sure, very intimidating terms.
• 2:56
  Speaker 3: Right, But understanding this conflict is really about understanding foundational
• 3:01
  Speaker 3: fabric of reality that surrounds you every single day. I mean,
• 3:05
  Speaker 3: we were talking about the fundamental architecture of the space
• 3:08
  Speaker 3: you are sitting in right now as you listen to this.
• 3:10
  Speaker 2: Okay, let's untack this because to really grasp what Joshua
• 3:14
  Speaker 2: Fu and his team have discovered, we first need to
• 3:16
  Speaker 2: set the stage a bit.
• 3:17
  Speaker 3: We need to look at the mechanics of this great
• 3:19
  Speaker 3: physics standoff.
• 3:20
  Speaker 2: Right starting with the microscopic rule book. One of the
• 3:22
  Speaker 2: core completely proven features of quantum mechanics is delocalization.
• 3:27
  Speaker 3: Yeah, delocalization, or as it is more commonly known in physics,
• 3:31
  Speaker 3: being in a state of superposition.
• 3:33
  Speaker 2: Okay, break that down for us.
• 3:35
  Speaker 3: Well, in our everyday macroscopic world, an object has a
• 3:38
  Speaker 3: definitive location. You know, your coffee cup is on the.
• 3:41
  Speaker 2: Desk, right, It's not in the fridge exactly.
• 3:44
  Speaker 3: It is nowhere else. But in the quantum realm, that
• 3:47
  Speaker 3: intuitive rule just vanishes. Quantum mechanics dictates that a particle
• 3:52
  Speaker 3: doesn't just exist in one spot. It exists as a wave.
• 3:56
  Speaker 2: Of probabilities, so until someone looks at it.
• 3:59
  Speaker 3: Right, until it is observed or measured, an object can
• 4:02
  Speaker 3: literally exist in multiple places at the exact same time.
• 4:05
  Speaker 2: Which I mean that sounds completely counterintuitive, but scientists have
• 4:10
  Speaker 2: routinely tested.
• 4:11
  Speaker 3: And proven though over and over again.
• 4:12
  Speaker 2: Yeah, and not just with invisible, abstract mathematical concepts, but
• 4:15
  Speaker 2: with actual physical matter. They have put actual atoms and
• 4:19
  Speaker 2: even like small clumps of metal into states where they
• 4:22
  Speaker 2: are literally delocalized.
• 4:24
  Speaker 3: Yes, a tiny piece of matter is literally sitting over
• 4:27
  Speaker 3: here and sitting over there simultaneously.
• 4:29
  Speaker 2: That is wild.
• 4:31
  Speaker 3: It is the essential starting point. Yeah, the object is
• 4:33
  Speaker 3: genuinely in a superposition of locations. Now, contrast that quantum
• 4:38
  Speaker 3: reality with the gravity reality of Einstein's rule book.
• 4:40
  Speaker 2: Okay, So moving from the tiny to the massive.
• 4:43
  Speaker 3: Right before Einstein, we mostly thought of gravity as just
• 4:46
  Speaker 3: an invisible tether pulling things together like a magnet. Sure,
• 4:50
  Speaker 3: but Einstein showed us that gravity is actually the shape
• 4:53
  Speaker 3: of space and time itself.
• 4:55
  Speaker 2: Space time.
• 4:55
  Speaker 3: Yes, space time is a dynamic, flexible fabric. Massive objects
• 5:01
  Speaker 3: bend and curve it, much like a bowling ball resting
• 5:04
  Speaker 3: on a trampoline.
• 5:05
  Speaker 2: And that curvature is what we actually feel as gravity exactly.
• 5:08
  Speaker 3: It can be flat and empty space or deeply curved
• 5:11
  Speaker 3: around a star, or it can even have ripples and
• 5:14
  Speaker 3: waves propagating through it.
• 5:15
  Speaker 2: Which we have definitively proven with gravitational wave detectors.
• 5:19
  Speaker 3: We have. So gravity is the literal physical geometry of
• 5:22
  Speaker 3: the universe.
• 5:23
  Speaker 2: Okay, I see where this is going. We have quantum
• 5:25
  Speaker 2: mechanics saying a physical mass like that small clump of
• 5:28
  Speaker 2: metal we talked about can exist in two different places
• 5:30
  Speaker 2: at the exact same time. Yes, But we also have
• 5:33
  Speaker 2: Einstein saying that all mass warps the space time around it.
• 5:36
  Speaker 2: So if that quantum clump of metal is in a superposition,
• 5:40
  Speaker 2: if it is in two places at once, and that
• 5:42
  Speaker 2: object is warping the space around it.
• 5:44
  Speaker 3: So what happens to the space exactly?
• 5:47
  Speaker 2: Does its gravitational field also exist in two places at once? Like,
• 5:51
  Speaker 2: is the literal shape of space and time fracturing into
• 5:54
  Speaker 2: a quantum superposition?
• 5:56
  Speaker 3: You have just outlined the exact paradox that keeps theoretical
• 5:59
  Speaker 3: fish assists awake at night. Oh man, I bet because
• 6:02
  Speaker 3: according to our current understanding of how these two forces
• 6:05
  Speaker 3: should logically interact, Yes, that is what ought to happen.
• 6:09
  Speaker 3: Which really, if the source of the gravity is in
• 6:12
  Speaker 3: a quantum state of superposition, the space time fabric around
• 6:15
  Speaker 3: it should also be forced into a multiple state quantum superposition.
• 6:20
  Speaker 2: Wow, I'm trying to picture that, and it feels like
• 6:22
  Speaker 2: my brain is doing backflips. It's like trying to imagine
• 6:25
  Speaker 2: a single room where the walls are simultaneously completely straight
• 6:28
  Speaker 2: and heavily curved inward at the exact same moment.
• 6:31
  Speaker 3: Is a highly accurate way to visualize the paradox? Yeah,
• 6:35
  Speaker 3: and you know, because it is so difficult to conceptualize,
• 6:37
  Speaker 3: it is exponentially harder to actually test in a laboratory.
• 6:40
  Speaker 2: I can't even imagine how you build a machine for that.
• 6:43
  Speaker 3: Right, you are looking for a signature of something a
• 6:46
  Speaker 3: fractured superposed reality that we don't even possess a complete
• 6:50
  Speaker 3: mathematical language for yet.
• 6:51
  Speaker 2: So how are they trying to test it?
• 6:53
  Speaker 3: Well, Physicists have spent years dreaming up incredibly delicate experiments.
• 6:58
  Speaker 3: The general idea is to take a tiny microscopic mass,
• 7:02
  Speaker 3: put it into a quantum superposition, and then place another
• 7:05
  Speaker 3: mass nearby.
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  Speaker 2: To see if the second mask gets pulled in two
• 7:08
  Speaker 2: different directions.
• 7:09
  Speaker 3: Exactly to see if it reacts to two distinct gravitational
• 7:12
  Speaker 3: fields simultaneously. If the second mass reacts to a fractured
• 7:17
  Speaker 3: gravitational field, we would finally have undeniable proof of quantum gravity.
• 7:21
  Speaker 2: Here's where it gets really interesting, because this is exactly
• 7:24
  Speaker 2: what the new research in NPGA quantum information actually addresses.
• 7:29
  Speaker 3: Yes it is.
• 7:29
  Speaker 2: Joshua Fu and his team looked at these highly sought
• 7:32
  Speaker 2: after experimental setups, and they discovered that many of the
• 7:36
  Speaker 2: scenario scientists thought would be definitive proof of quantum gravity
• 7:39
  Speaker 2: might actually just be an illusion.
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  Speaker 3: They developed a completely new theoretical framework to analyze these
• 7:45
  Speaker 3: proposed experiments. They call it the relativity of spacetime superpositions.
• 7:49
  Speaker 2: And the conclusions are startling, right.
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  Speaker 3: They really are. They demonstrated mathematically that the exact physical
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  Speaker 3: signatures scientists have been hoping to find in these experiments
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  Speaker 3: they could be produced with out quantum gravity ever be involved.
• 8:02
  Speaker 2: Wait, so if it's an illusion, does that mean the
• 8:04
  Speaker 2: laboratory instrument is just misreading the gravity of the particle.
• 8:07
  Speaker 2: Is the gravity of space time itself?
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  Speaker 3: That's a good way to put it.
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  Speaker 2: Yeah, like looking at a bent stick in a glass
• 8:13
  Speaker 2: of water and falsely assuming the water itself is broken.
• 8:16
  Speaker 2: I mean, how exactly is classical gravity pulling off this disguise.
• 8:20
  Speaker 3: Let's build on that idea of an optical illusion. Imagine
• 8:23
  Speaker 3: you were watching a shadow Peppe show on a wall.
• 8:26
  Speaker 2: Okay, I'm picturing it.
• 8:27
  Speaker 3: You see the shadow of what clearly looks like a
• 8:30
  Speaker 3: strange two headed dog. In the context of our physics experiment,
• 8:35
  Speaker 3: that two headed dog represents quantum gravity.
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  Speaker 2: A fractured superposed space time.
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  Speaker 3: Right, And for decades, physicists assumed that if they saw
• 8:44
  Speaker 3: that specific shadow on the wall of their detector, it
• 8:47
  Speaker 3: meant a two headed dog truly existed.
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  Speaker 2: Because what else could cast that specific shadow right precisely?
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  Speaker 3: But what Joshua Fu and his colleagues proved is that
• 8:56
  Speaker 3: you can cast that exact same complex two headed shadow
• 9:00
  Speaker 3: using just a normal, single pair of human hands moving
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  Speaker 3: in a very specific erratic way.
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  Speaker 2: Oh wow.
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  Speaker 3: Yeah, the hands represent normal standard quantum particles moving through
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  Speaker 3: an entirely ordinary, classical space time.
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  Speaker 2: So the particles are doing the weird quantum things, yes.
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  Speaker 3: And as a result, they generate a fluctuating gravitational signature
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  Speaker 3: that to our instruments looks identical to fractured space time.
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  Speaker 3: But the space time itself isn't fractured at all.
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  Speaker 2: So the space time is perfectly normal. It's just Einstein's
• 9:32
  Speaker 2: standard trampoline. It's just the quantum particles bouncing around on
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  Speaker 2: top of it that are creating a gravitational footprint that
• 9:37
  Speaker 2: mimics quantum gravity.
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  Speaker 3: Yes. What's fascinating here is how the researchers mathematically articulated this.
• 9:43
  Speaker 3: They developed an analogy based on how we map the.
• 9:46
  Speaker 2: Earth, like a literal rerun old map.
• 9:48
  Speaker 3: Yeah, think about a world map. You can have two
• 9:50
  Speaker 3: different maps describing the exact same physical planet, but using
• 9:54
  Speaker 3: entirely different mathematical projections.
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  Speaker 2: Oh, like how a standard Mercader projection map makes Greenland
• 10:00
  Speaker 2: look absolutely.
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  Speaker 3: Massive, right, larger than Africa.
• 10:02
  Speaker 2: But a different projection shows their true relative sizes. They
• 10:07
  Speaker 2: look completely different visually, but they are both mathematically valid
• 10:11
  Speaker 2: ways to describe the exact same globe.
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  Speaker 3: That is, the perfect parallel. In this physic scenario, one
• 10:18
  Speaker 3: mathematical map or coordinate system describes the physical event as
• 10:22
  Speaker 3: gravity itself being in a wild, fractured quantum superposition. Okay,
• 10:27
  Speaker 3: but the researchers proved there is another equally valid mathematical
• 10:32
  Speaker 3: map for the exact same physical event, And if you
• 10:35
  Speaker 3: switch to that second map, the equations show gravity behaving perfectly.
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  Speaker 2: Classically, so the weirdness is entirely contained within the particles themselves.
• 10:43
  Speaker 3: Exactly, because both mathematical maps describe the exact same underlying reality,
• 10:48
  Speaker 3: you cannot look at the result of your experiment and
• 10:50
  Speaker 3: claim you have discovered quantum gravity.
• 10:52
  Speaker 2: Because the classical gravity map fits the data just as
• 10:54
  Speaker 2: perfectly precisely. Wait, hold on, I have to push back here.
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  Speaker 2: If this new framework proves that class ordinary gravity can
• 11:01
  Speaker 2: perfectly mimic quantum gravity mathematically, how do we know the
• 11:06
  Speaker 2: math in this new framework isn't the illusion?
• 11:09
  Speaker 3: That's a very fair question.
• 11:10
  Speaker 2: Couldn't this new map they created just be a mathematical
• 11:13
  Speaker 2: loophole rather than physical reality, Like, are we just giving
• 11:16
  Speaker 2: up on uniting the two rule books because someone found
• 11:19
  Speaker 2: a clever coordinate trick.
• 11:20
  Speaker 3: That is a phenomenal question, and it really strikes at
• 11:24
  Speaker 3: the heart of theoretical physics. It is vital to clarify
• 11:27
  Speaker 3: that this research team is absolutely not saying quantum gravity
• 11:30
  Speaker 3: doesn't exist. Okay, shew right, They aren't giving up on
• 11:33
  Speaker 3: finding it. Magdalene Zeke, a researcher from Stockholm University and
• 11:37
  Speaker 3: a co author of the paper, emphasized this extensively. Their
• 11:41
  Speaker 3: framework doesn't disprove the existence of quantum gravity.
• 11:44
  Speaker 2: It doesn't mean the universe operates purely on classical gravity.
• 11:47
  Speaker 3: No, not at all.
• 11:47
  Speaker 2: So the dream of a unified theory is still alive.
• 11:50
  Speaker 2: The two headed dog might still be out there.
• 11:53
  Speaker 3: It very well might be. What this discovery actually does
• 11:57
  Speaker 3: is reveal a massive fundamental ambiguity in our experimental designs.
• 12:03
  Speaker 3: We thought we had a full proof trap set to
• 12:05
  Speaker 3: catch quantum gravity.
• 12:07
  Speaker 2: And it turns out the trap was flawed.
• 12:09
  Speaker 3: Exactly. Your pushback about mathematical loopholes is exactly the point
• 12:13
  Speaker 3: the researchers are making. If a result can be perfectly
• 12:16
  Speaker 3: explained by a classical mathematical loophole, then that result is
• 12:20
  Speaker 3: not definitive proof.
• 12:22
  Speaker 2: Oh I see. We could have run these billion dollar
• 12:24
  Speaker 2: experiments in a few years, gotten the signature we wanted,
• 12:27
  Speaker 2: and popped the champagne, and.
• 12:29
  Speaker 3: We would have been entirely unaware that standard classical gravity
• 12:32
  Speaker 3: could have produced the exact same data.
• 12:34
  Speaker 2: So what does this all mean? It sounds to me
• 12:37
  Speaker 2: like the physics community was about to confidently walk right
• 12:39
  Speaker 2: into a trap, and this research team just handed everyone
• 12:42
  Speaker 2: a flashlight.
• 12:43
  Speaker 3: That's a great analogy.
• 12:44
  Speaker 2: Before we can actually prove we found quantum gravity, we
• 12:47
  Speaker 2: have to know what undeniable proof actually looks like. We
• 12:51
  Speaker 2: have to design an experiment where the shadow on the
• 12:53
  Speaker 2: wall cannot possibly be made by human hands, no matter
• 12:56
  Speaker 2: how fast they move.
• 12:57
  Speaker 3: You have synthesized it perfectly. This paper is not a roadblock.
• 13:01
  Speaker 3: It is a roadmap. It acts as an incredibly powerful
• 13:05
  Speaker 3: filtering mechanism for future science.
• 13:07
  Speaker 2: To weed out the fakes.
• 13:09
  Speaker 3: Yes, by understanding the relativity of spacetime superpositions, scientists now
• 13:15
  Speaker 3: have the mathematical tools to filter out the imposter signals.
• 13:19
  Speaker 3: They can run a proposed experiment through this new framework
• 13:22
  Speaker 3: and say, well, no, this design is ambiguous. Classical gravity
• 13:25
  Speaker 3: could mimic this result.
• 13:26
  Speaker 2: It forces the entire field to be infinitely more precise.
• 13:30
  Speaker 2: They have to find experimental signatures that classical gravity simply
• 13:34
  Speaker 2: could not replicate, regardless of what mathematical map or coordinate
• 13:38
  Speaker 2: system you apply to the data exactly.
• 13:41
  Speaker 3: It might require looking into things like gravitational entanglement. What's
• 13:44
  Speaker 3: that it's seeing if gravity can entangle two distant quantum
• 13:47
  Speaker 3: particles in a way that only a quantum space time
• 13:50
  Speaker 3: fabric could mediate. But whatever that future experiment looks like,
• 13:54
  Speaker 3: we now have the blueprint to ensure we don't fall
• 13:57
  Speaker 3: for false.
• 13:57
  Speaker 2: Positives, which is the hallmark of rigorous You don't just
• 14:00
  Speaker 2: want an answer that fits your hypothesis, You want an
• 14:03
  Speaker 2: answer that destroys every other possible alternative. Absolutely, but let's
• 14:07
  Speaker 2: bring this down to earth for a moment, because you,
• 14:09
  Speaker 2: the listener, you might be taking all this in and thinking, Okay,
• 14:11
  Speaker 2: this is a fascinating puzzle space.
• 14:13
  Speaker 3: Time superpositions, optical illusions in theoretical physics, mathematical maps.
• 14:18
  Speaker 2: Right, but why does this matter to me? How does
• 14:21
  Speaker 2: the nuanced interpretation of a theoretical gravity experiment actually impact
• 14:26
  Speaker 2: everyday human life.
• 14:28
  Speaker 3: It is the most important question to ask of any
• 14:30
  Speaker 3: fundamental research. And if we connect this to the bigger picture,
• 14:34
  Speaker 3: we have to look at the historical precedent of pure science.
• 14:37
  Speaker 2: Okay, tell me more about that.
• 14:39
  Speaker 3: Throughout human history, studying the deepest, most abstract, seemingly impractical
• 14:44
  Speaker 3: laws of nature has invariably led to the greatest technological
• 14:48
  Speaker 3: leaps in civilization.
• 14:49
  Speaker 2: So it is never just an academic exercise. The pursuit
• 14:53
  Speaker 2: of pure knowledge always eventually bleeds into tangible reality.
• 14:57
  Speaker 3: Always. Let's look back at the two rule books we
• 14:59
  Speaker 3: start it with. When quantum mechanics was first being formalized
• 15:02
  Speaker 3: in the nineteen twenties and thirties, it was purely.
• 15:05
  Speaker 2: Theoretical, just equations on a blackboard.
• 15:07
  Speaker 3: Yeah, just brilliant minds arguing over chalkboards about the statistical
• 15:11
  Speaker 3: probabilities of electron positions. It seemed completely divorced from the
• 15:15
  Speaker 3: physical reality of, say, building a bridge or growing crops.
• 15:19
  Speaker 3: But today, today, the modern electronics you use every single
• 15:22
  Speaker 3: day rely entirely on those discoveries. The microchips in your
• 15:26
  Speaker 3: smartphone only function because engineers understand quantum tunneling.
• 15:30
  Speaker 2: Which is the ability of an electron to pass through
• 15:32
  Speaker 2: a solid barrier.
• 15:33
  Speaker 3: Right, exactly. If we didn't understand that quantum behavior, modern
• 15:37
  Speaker 3: transistors wouldn't work, flash memory wouldn't exist.
• 15:40
  Speaker 2: Oh wow.
• 15:41
  Speaker 3: Yeah, And lasers, which are used in everything from grocery
• 15:44
  Speaker 3: store barcode scanners to the fiber optic cables delivering the Internet.
• 15:48
  Speaker 3: They are a direct application of quantum atomic states.
• 15:51
  Speaker 2: You literally could not build the modern digital world without
• 15:55
  Speaker 2: the abstract equations of quantum mechanics.
• 15:57
  Speaker 3: You couldn't. And the exact same principle applies to Einstein's
• 16:00
  Speaker 3: theory of general relativity.
• 16:02
  Speaker 2: Really how so well.
• 16:04
  Speaker 3: When Einstein proposed that massive bodies curve the fabric of
• 16:07
  Speaker 3: space time, it was a beautiful, elegant mathematical concept to
• 16:12
  Speaker 3: explain planetary orbits. But fasterward to today and consider the
• 16:16
  Speaker 3: GPS navigation system in your car or phone.
• 16:19
  Speaker 2: Oh, this is the perfect example of why this stuff matters.
• 16:22
  Speaker 2: The satellites for GPS.
• 16:24
  Speaker 3: Right, the GPS network relies on satellites orbiting the Earth
• 16:28
  Speaker 3: at roughly twelve thousand miles above the surface, moving at
• 16:30
  Speaker 3: about nine thousand miles per hour. That's incredibly fast, it is,
• 16:34
  Speaker 3: and because of Einstein's relativity time actually flows differently for
• 16:38
  Speaker 3: those satellites than it does for you.
• 16:39
  Speaker 2: On the ground because they're moving so fast.
• 16:41
  Speaker 3: Yes, their high speed slows their relative time down, but
• 16:45
  Speaker 3: being further away from Earth's gravitational mass speeds their relative
• 16:49
  Speaker 3: time up.
• 16:49
  Speaker 2: Okay, so it's a balancing act, it.
• 16:51
  Speaker 3: Is, and the net result is that the clocks on
• 16:53
  Speaker 3: GPS satellites tick faster by about thirty eight microseconds every
• 16:57
  Speaker 3: single day compared to clocks on.
• 16:59
  Speaker 2: Earth, which sounds like an incredibly tiny amount thirty eight
• 17:02
  Speaker 2: millions of a second.
• 17:03
  Speaker 3: It sounds tiny, but light travels very fast. If engineers
• 17:07
  Speaker 3: didn't program those satellites to account for the relativistic curving
• 17:10
  Speaker 3: of space and time, that thirty eight microsecond drift would
• 17:14
  Speaker 3: translate to a navigational error of roughly seven miles per day.
• 17:17
  Speaker 3: You're kidding, I'm not. Within a week, your smartphone's map
• 17:21
  Speaker 3: would place you in the middle of the ocean when
• 17:23
  Speaker 3: you were driving down the highway. The entire global logistics
• 17:26
  Speaker 3: network would collapse.
• 17:27
  Speaker 2: So the technologies that completely define our twenty first century civilization,
• 17:31
  Speaker 2: global telecommunications, the Internet, modern computing, global navigation, they only
• 17:37
  Speaker 2: exist because we figured out those two separate seemingly abstract
• 17:42
  Speaker 2: rule books.
• 17:42
  Speaker 3: That is the ultimate takeaway, and right now we are
• 17:45
  Speaker 3: standing on the precipice of uniting those two rule books.
• 17:48
  Speaker 2: Wow.
• 17:49
  Speaker 3: Understanding how gravity and quantum mechanics fit together into a
• 17:52
  Speaker 3: unified theory of quantum gravity isn't just to satisfy the
• 17:56
  Speaker 3: intellectual curiosity of theoretical physicists. It is the gateway way
• 18:00
  Speaker 3: to the next generation of unimasurable technology.
• 18:03
  Speaker 2: Just as the pioneers of early quantum mechanics couldn't possibly
• 18:06
  Speaker 2: foresee the smartphone or the Internet.
• 18:08
  Speaker 3: Exactly, we cannot fully predict what a unified theory of
• 18:12
  Speaker 3: quantum gravity will unlock, but history guarantees it will be revolutionary.
• 18:17
  Speaker 3: We are talking about humanity gaining the ability to understand
• 18:20
  Speaker 3: and potentially manipulate the deepest foundational fabric of reality itself.
• 18:25
  Speaker 2: Which is exactly why it is so critically important that
• 18:28
  Speaker 2: we get the search right. We have to use the
• 18:30
  Speaker 2: roadmap provided by Joshua Fu and his team to find
• 18:34
  Speaker 2: the real quantum gravity, not a classical illusion.
• 18:37
  Speaker 3: We really do.
• 18:38
  Speaker 2: Okay, let's do a quick, energetic wrap up of the
• 18:40
  Speaker 2: journey we've taken today. We started with the ultimate standoff
• 18:43
  Speaker 2: in modern physics, the rule book of the tiny, where
• 18:46
  Speaker 2: physical matter exists in a smeared wave of multiple locations.
• 18:50
  Speaker 3: At once, versus the rule book of the massive, where
• 18:53
  Speaker 3: space and time bend and curve like a trampoline.
• 18:55
  Speaker 2: And we explore the incredible paradox that arises when you
• 18:59
  Speaker 2: combine them, the terrifying, brilliant concept of spacetime itself fracturing
• 19:03
  Speaker 2: into a quantum superposition, the.
• 19:05
  Speaker 3: Room where the walls are simultaneously straight and curved.
• 19:08
  Speaker 2: Yeah, and then we dove into the massive plot twist,
• 19:12
  Speaker 2: the brilliant new analytical framework, the relativity of spacetime superpositions.
• 19:18
  Speaker 2: We broke down the shadow puppet analogy, seeing how a
• 19:21
  Speaker 2: totally normal classical space time can be manipulated by quantum
• 19:26
  Speaker 2: particles to cast a gravitational shadow that perfectly mimics a
• 19:30
  Speaker 2: fractured reality.
• 19:31
  Speaker 3: But rather than viewing this as a defeat, we saw
• 19:34
  Speaker 3: how this mathematical equivalence the two different maps describing the
• 19:37
  Speaker 3: same physical globe is actually a powerful tool.
• 19:40
  Speaker 2: It gives researchers the precise filtering mechanism they need to
• 19:44
  Speaker 2: eliminate false positives.
• 19:46
  Speaker 3: Exactly ensuring that when we finally do detect quantum gravity,
• 19:50
  Speaker 3: we will know for an absolute fact that we are
• 19:52
  Speaker 3: looking at the real fabric of the universe.
• 19:54
  Speaker 2: It is the ultimate truth detector for the Holy Grail physics.
• 19:57
  Speaker 2: And we saw how chasing these seemingly disconnected abstract concepts
• 20:02
  Speaker 2: is exactly the process that leads to the life changing,
• 20:05
  Speaker 2: civilization altering technologies we will be using in the centuries
• 20:08
  Speaker 2: to come.
• 20:09
  Speaker 3: This raises an important question, though, one that goes far
• 20:11
  Speaker 3: beyond just the physics we discussed, okay, late on us.
• 20:14
  Speaker 3: We've seen today how a specific observable physical scenario can
• 20:19
  Speaker 3: be perfectly mathematically described by two entirely different maps. One
• 20:23
  Speaker 3: map shows a wildly fractured quantum reality, while the other
• 20:27
  Speaker 3: shows a smooth, classical one. Both are entirely mathematically valid,
• 20:32
  Speaker 3: depending purely on the perspective or coordinate system you choose.
• 20:35
  Speaker 2: To use, So they're both true mathematically speaking, exactly.
• 20:38
  Speaker 3: So if the fundamental laws of nature can perfectly disguise
• 20:41
  Speaker 3: themselves depending on the mathematical lens we use to observe them,
• 20:45
  Speaker 3: how much of our current, everyday understanding of the universe
• 20:48
  Speaker 3: is just a trick of the light. Oh wow, when
• 20:50
  Speaker 3: we finally pull back the curtain and look at the absolute, raw,
• 20:53
  Speaker 3: unfiltered fabric of reality. Will we even possess the senses
• 20:57
  Speaker 3: to recognize it?
• 20:58
  Speaker 2: That is exactly the kind of thought that keeps you
• 21:01
  Speaker 2: staring at the ceiling at two in the morning. Are
• 21:03
  Speaker 2: we just confidently reading one map entirely blind to the
• 21:07
  Speaker 2: true nature of the landscape beneath our fey Thank you
• 21:10
  Speaker 2: so much for joining us on this exploration today. We
• 21:12
  Speaker 2: hope you walked away with a little more awe for
• 21:14
  Speaker 2: the sheer complexity of the universe and a lot more
• 21:17
  Speaker 2: excitement for the future of discovery. Remember to keep questioning
• 21:21
  Speaker 2: the rule books, look closely at the shadows, and most importantly,
• 21:24
  Speaker 2: stay curious.