The Theory of Everything: Can Physics Be Unified?

<v Speaker 1>Welcome to the quart 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>You know, there's a there's a specific kind of arrogance
<v Speaker 2>in physics. Oh absolutely, And I don't mean that in
<v Speaker 2>a bad way. Necessarily. It's a it's a beautiful arrogance.
<v Speaker 2>It's this deep conviction that if we just stare at
<v Speaker 2>the blackboard long enough, if we just crunch the math
<v Speaker 2>hard enough, we can boil the entire chaotic mess of
<v Speaker 2>the universe down to one single line of code.
<v Speaker 3>The famous god equation, right.
<v Speaker 2>The theory of everything, a single framework that explains, you know,
<v Speaker 2>why the sky is blue, why black holes evaporate, and
<v Speaker 2>why you and I are conscious enough to sit here
<v Speaker 2>and talk about it.
<v Speaker 3>It is the ultimate reductionist stream.
<v Speaker 2>It really is. But for today's deep dive, we are
<v Speaker 2>digging into the text the quest for a final theory
<v Speaker 2>of everything, and the thing, well, the real story here
<v Speaker 2>isn't about that perfect equation. It's about the fact that
<v Speaker 2>we might have completely hit a wall.
<v Speaker 3>A wall or maybe a horizon. That is the big
<v Speaker 3>debate right now, because look, we've spent four hundred years
<v Speaker 3>unifying things, taking separate phenomenon and proving their just different
<v Speaker 3>sides of the same coin. But now we are stuck
<v Speaker 3>in what might literally be the deepest rut in the
<v Speaker 3>history of science.
<v Speaker 2>And that is exactly what we are unpacking for you today.
<v Speaker 2>We aren't just doing some dry history lesson. We want
<v Speaker 2>to look at the actual breakdown.
<v Speaker 3>The Great schism exactly.
<v Speaker 2>We've got general relativity on one side, quantum mechanics on
<v Speaker 2>the other, and they absolutely hate each other. Plus we've
<v Speaker 2>got string theory, which promised to fix everything but maybe
<v Speaker 2>got lost in its own math.
<v Speaker 3>And then you get into the existential stuff.
<v Speaker 2>Oh yeah, consciousness, Yeah, Goder's incompleteness theorems, the actual limits
<v Speaker 2>of what the human brain can comprehend.
<v Speaker 3>It forces you to step back and ask is the
<v Speaker 3>universe actually a puzzle with a final neat solution or
<v Speaker 3>are we just peeling an onion that has infinite layers.
<v Speaker 2>That is the perfect way to set the mission for
<v Speaker 2>this deep dive. But let's look at the track record first,
<v Speaker 2>because that is where all this optimism comes from, right
<v Speaker 2>if you look at the history of physics, it's effectively
<v Speaker 2>a history of things merging.
<v Speaker 3>Yeah, we call it the drive toward unification. It basically
<v Speaker 3>kicks off with Newton in the seventeenth century, and I
<v Speaker 3>everyone knows the whole apple falling from the tree story,
<v Speaker 3>the classic physics myth, right, But the real breakthrough there
<v Speaker 3>wasn't just discovering gravity. It was the universality of it.
<v Speaker 3>Because before Newton, people actually thought objects on Earth and
<v Speaker 3>objects in the sky were governed by completely different.
<v Speaker 2>Rules, right, the Aristotelian idea. Yeah, the heavens were divine
<v Speaker 2>and perfect, and the Earth was messy and corruptible. The
<v Speaker 2>moon didn't play by the same rules as an apple.
<v Speaker 3>Exactly and completely smash that. He proved that the moon
<v Speaker 3>is actually falling just like the apple. It just have
<v Speaker 3>enough sideways motion tangential velocity to keep missing the Earth
<v Speaker 3>as it falls. So suddenly you have one mechanical principle,
<v Speaker 3>one gravitational force, governing the entire cosmos.
<v Speaker 2>One law to rule them all. Yeah. And then you
<v Speaker 2>fast forward to the nineteenth century and James click Maxwell
<v Speaker 2>does the.
<v Speaker 3>Same thing with electromagnetism.
<v Speaker 2>Yeah, before him, you had electricity like lightning or static shocks,
<v Speaker 2>you had magnetism guiding compasses, totally separate things. Maxwell unifies
<v Speaker 2>them into a single electromagnetic force. And the craziest part,
<v Speaker 2>the cherry on top, is he realizes that light itself
<v Speaker 2>is just an electromagnetic wave.
<v Speaker 3>It's just a brilliant winning streak for physics. And then
<v Speaker 3>Einstein comes along in the twentieth century.
<v Speaker 2>If we ultimate merger right.
<v Speaker 3>He unifies space and time into the fabric of space
<v Speaker 3>time and shows that the geometry of that fabric is
<v Speaker 3>what determines gravity. Then by the late twentieth century we
<v Speaker 3>get the standard.
<v Speaker 2>Model, which is where things start to get a bit sticky.
<v Speaker 3>Well, yes and no, the standard model is incredible. Glassio
<v Speaker 3>Salaam and Weinberg manage to unify the electromagnetic force with
<v Speaker 3>the weak nuclear force. We call it electroweak unification, and
<v Speaker 3>they incorporate the strong nuclear force too.
<v Speaker 2>So we basically have a periodic table of fundamental particles and.
<v Speaker 3>It works beautifully. It is arguably the most precisely tested
<v Speaker 3>theory humans have ever created. But there is a massive catch.
<v Speaker 2>It leaves out gravity.
<v Speaker 3>Exactly, leaves gravity totally out in the cold.
<v Speaker 2>And this is where that schism happens, as you called it.
<v Speaker 2>It's the part of the source material that always blows
<v Speaker 2>my mind. We basically have two rule books for the universe.
<v Speaker 3>And they refuse to talk to each other.
<v Speaker 2>Right, You've got general relativity for the massive stuff stars, galaxies,
<v Speaker 2>black holes, smooth continuous space time, and then you have
<v Speaker 2>quantum mechanics for the tiny stuff atams quarks. But the
<v Speaker 2>quantum world is discrete, it's point like, it's jumpy, and
<v Speaker 2>they work perfectly in their own separate domains.
<v Speaker 3>But if you try to combine them.
<v Speaker 2>Total disaster.
<v Speaker 3>Total disaster.
<v Speaker 2>But mechanically speaking, why, I mean, why can't we just
<v Speaker 2>take the gravity equations and add them to the quantum equations.
<v Speaker 3>It comes down to something called renormalization. In quantum mechanics,
<v Speaker 3>we treat fundamental particles like electrons as zero dimensional points.
<v Speaker 3>When you calculate the forces between them, you have to
<v Speaker 3>sum up all the infinite possible ways they can.
<v Speaker 2>Interact, which sounds like a math nightmare.
<v Speaker 3>It is, infinities pop up everywhere in the equations. But
<v Speaker 3>in the standard model we have these brilliant mathematical tricks.
<v Speaker 3>It's renormalization to essentially cancel out those infinities, so we
<v Speaker 3>get usable answers.
<v Speaker 2>But gravity doesn't play nice with those tricks.
<v Speaker 3>No it doesn't, because gravity isn't just a force acting
<v Speaker 3>on a stage. It is the geometry of the stage itself. Space.
<v Speaker 3>If you try to treat gravity as a quantum force
<v Speaker 3>acting on a zero distance point particle, the curvature of
<v Speaker 3>space becomes infinite.
<v Speaker 2>The math literally blows up.
<v Speaker 3>It blows up. You get infinity as an answer for
<v Speaker 3>every single calculation, which means the theory is useless.
<v Speaker 2>So at the plank scale, like the tiniest possible resolution
<v Speaker 2>of reality, the smooth trampoline fabric of Einstein's gravity violently
<v Speaker 2>clashes with the jittery, pixelated nature of the quantum world.
<v Speaker 3>Exactly to get a theory of everything, those two frameworks
<v Speaker 3>have to be married. We need a new theory of
<v Speaker 3>quantum gravity.
<v Speaker 2>And for the last few decades the absolute heavyweight contender
<v Speaker 2>for that crown has been string theory.
<v Speaker 3>Oh, string theory was supposed to be the white Knight
<v Speaker 3>that saved physics.
<v Speaker 2>And the initial pitch is so elegant. You just get
<v Speaker 2>rid of the point particles. You say, okay, fundamental particles
<v Speaker 2>aren't dots. They are tiny, one dimensional vibrating strings.
<v Speaker 3>Right, and the frequency of the vibration determines what particle
<v Speaker 3>it is.
<v Speaker 2>Yeah, an electron is just a string vibrating in one key,
<v Speaker 2>and a photon is vibrating in another.
<v Speaker 3>And because it's a string, it has actual length. It's
<v Speaker 3>not a zero dimensional point anymore. That physical length smears
<v Speaker 3>out the interaction over a tiny distance, which totally bypasses
<v Speaker 3>those nasty infinities we talked about.
<v Speaker 2>The math suddenly works.
<v Speaker 3>It works beautifully, And the absolute best part, one of
<v Speaker 3>the natural vibrational modes of these strings looks exactly like
<v Speaker 3>a graviton.
<v Speaker 2>The theoretical particle that carries the force of gravity.
<v Speaker 3>Yes, so gravity isn't forced into the theory, It emerges
<v Speaker 3>naturally from the geometry of the strings.
<v Speaker 2>It sounds like a home run. I mean, it unites
<v Speaker 2>gravity and quantum mechanics perfectly.
<v Speaker 3>Yeah.
<v Speaker 2>So why are we reading an entire text about the
<v Speaker 2>failure to find a final theory. Why isn't string theory
<v Speaker 2>the undisputed law of the land.
<v Speaker 3>Because string theory made a sort of faustion bargain to
<v Speaker 3>make the math work, to get rid of the anomalies
<v Speaker 3>those strings need more room to vibrate, way more room
<v Speaker 3>than our universe appears to have. The theory flat out demands extra.
<v Speaker 2>Dimension ten dimensions total, right, nine spatial.
<v Speaker 3>And one time, or eleven if you're talking about m theory.
<v Speaker 2>But we only see three dimensions of space up, down, left, right,
<v Speaker 2>forward back. Where are the other six hiding?
<v Speaker 3>The mathematical claim is that they are compactified. They are
<v Speaker 3>curled up in to these unbelievably tiny complex shapes. They're
<v Speaker 3>called Colobbio manifolds at every single point in space. They're
<v Speaker 3>so small we just can't perceive them.
<v Speaker 2>Okay, but here's the massive problem that text highlights with that.
<v Speaker 2>The specific shape of those curled up extra dimensions determines
<v Speaker 2>how the strings can vibrate right correct, and the vibrations
<v Speaker 2>determine the laws of physics, the mass of an electron,
<v Speaker 2>the strength of gravity.
<v Speaker 3>Exactly, the geometry dictates the physics.
<v Speaker 2>But there isn't just one mathematical way to fold up
<v Speaker 2>those extra dimensions.
<v Speaker 3>No, there are an estimated ten to the five hundredth
<v Speaker 3>power different ways to fold them.
<v Speaker 2>Ten to the five hundred That is a one followed
<v Speaker 2>by five hundred zeros.
<v Speaker 3>It is an incomprehensibly large number, and each one of
<v Speaker 3>those folds creates a different universe with completely different physical laws.
<v Speaker 2>This is what the source calls the landscape problem.
<v Speaker 3>Yes, strength theory doesn't actually describe our universe. It describes
<v Speaker 3>a near infinite landscape of potential universes, and it has
<v Speaker 3>absolutely no mechanism to tell us why we happen to
<v Speaker 3>live in this specific one.
<v Speaker 2>It feels like we went from searching for a theory
<v Speaker 2>of everything to ending up with a theory of anything.
<v Speaker 3>That is the primary criticism. It is mathematically gorgeous, but
<v Speaker 3>it's physically predictively weak. Plus, string theory relies heavily on supersymmetry, the.
<v Speaker 2>Idea that every matter particle has a heavier forced particle partner.
<v Speaker 3>Right, And we built the Large Hadrin Collider in part
<v Speaker 3>to find those superpartners. We found the Higgs boson, which
<v Speaker 3>was a huge triumph for the standard model, but we
<v Speaker 3>found zero evidence of supersymmetry, which.
<v Speaker 2>Kind of leaves string theory floating in the wind a bit. So,
<v Speaker 2>if string theory is the front runner that's stumbling, what
<v Speaker 2>is the alternative? Loop quantum gravity?
<v Speaker 3>Loop quantum gravity or LQG is definitely the main rival,
<v Speaker 3>and it takes a radically different approach. It doesn't bother
<v Speaker 3>with Husher dimensions, it doesn't use strings. It focuses entirely
<v Speaker 3>on the fabric of space time itself.
<v Speaker 2>It basically says space isn't smooth at all. It's quantized exactly.
<v Speaker 3>It suggests space time is made of tiny disc great
<v Speaker 3>loops or spin networks at the plank scale. Think of
<v Speaker 3>a medieval chain mail shirt. Okay, from across the room,
<v Speaker 3>it looks like a smooth sheet of flexible metal, but
<v Speaker 3>if you walk up close, you see it's actually made
<v Speaker 3>of thousands of individual interlocking rings. LQG says space is
<v Speaker 3>exactly like that chain mail. There is a smallest possible
<v Speaker 3>pixel of space, and you cannot divide it any further, And.
<v Speaker 2>That solves the infinity problem we had earlier. Yeah, because
<v Speaker 2>you can never get to a zero distance point, you
<v Speaker 2>eventually just hit the bottom of the pixel.
<v Speaker 3>Precisely. It doesn't assume a background stage that particles act on.
<v Speaker 3>It literally builds the stage out of quantum rules. But
<v Speaker 3>it has its own massive flaw. It has a really
<v Speaker 3>hard time recovering the standard physics.
<v Speaker 2>We already know, like electromagnetism.
<v Speaker 3>Right, It's very hard to extract the standard forces from
<v Speaker 3>those loops.
<v Speaker 2>So we are at a stalemate. But I want to
<v Speaker 2>pivot here because this next section of the source materials
<v Speaker 2>will really kept me up at night. The roadblocks the
<v Speaker 2>deeply unsettling idea that even if we fix the math,
<v Speaker 2>there are philosophical walls we just might not be able
<v Speaker 2>to smash through.
<v Speaker 3>The limits of the quest itself.
<v Speaker 2>Yeah, starting with the problem of initial conditions.
<v Speaker 3>This is a crucial distinction. It's the difference between the
<v Speaker 3>laws of the game and the setup of the board.
<v Speaker 3>A theory of everything would give us the laws. It
<v Speaker 3>would tell us exactly how the universe evolves from moment
<v Speaker 3>A to moment B the recipe, right, but it cannot
<v Speaker 3>tell us why moment A was set up that way
<v Speaker 3>in the first place. It doesn't give us the ingredients.
<v Speaker 2>It doesn't tell us why the Big Bang had that
<v Speaker 2>specific amount of entropy, or why the expansion rate was
<v Speaker 2>tuned exactly the way it was.
<v Speaker 3>And this ties directly into the anthropic principle. When we
<v Speaker 3>look around, we observe that the fundamental constants of nature,
<v Speaker 3>the strength of gravity, the mass of protons, they seem
<v Speaker 3>incredibly finely tuned for life to exist.
<v Speaker 2>Yeah, if gravity were just slightly stronger, stars would burn
<v Speaker 2>out way too fast for revolution to happen. If it
<v Speaker 2>were slightly weaker, matter would never clump together to form
<v Speaker 2>stars at all.
<v Speaker 3>And this brings us right back to the multiverse. If
<v Speaker 3>string theory gives us ten to the five hundredth possibilities,
<v Speaker 3>maybe they all actually exist out there. Maybe there are
<v Speaker 3>billions of dead, empty universes and we are just sitting
<v Speaker 3>in the one lucky bubble where the numbers randomly align
<v Speaker 3>to allow carbon based life.
<v Speaker 2>The weak anthropic principle, we see a life friendly universe
<v Speaker 2>simply because if it weren't life friendly, we wouldn't be
<v Speaker 2>here to see it. It's a massive selection bias.
<v Speaker 3>But if that really is the answer, it is devastating
<v Speaker 3>for the whole concept of a final theory because it means.
<v Speaker 2>The numbers aren't derived from some beautiful underlying logic. We
<v Speaker 2>can't calculate the mass of the electron from first principles.
<v Speaker 2>It's just a random environmental accident exactly.
<v Speaker 3>It turns fundamental physics into local environmental science. We just
<v Speaker 3>be cataloging the weather of our specific universe, not discovering
<v Speaker 3>deep absolute truths that must be so.
<v Speaker 2>That is deeply depressing for a physicist, I imagine, But
<v Speaker 2>the text argues it gets even worse.
<v Speaker 3>Let's talk about the math itself. Wet's talk about Goodle
<v Speaker 3>because I alwaysssume that even if the physics gets messy,
<v Speaker 3>mathematics is the bedrock of absolute truth. Kurt Godel basically
<v Speaker 3>dropped a bomb on that assumption in the nineteen thirties
<v Speaker 3>with his incompleteness theorems. He proved mathematically that in any
<v Speaker 3>logical system complex enough to do basic arithmetic, there will
<v Speaker 3>always be true statements that simply cannot be proving from
<v Speaker 3>within that system.
<v Speaker 2>Statements that are true but unprovable. It almost sounds like
<v Speaker 2>a zen Cohen It is.
<v Speaker 3>A fundamental feature of logic. Now apply that to physics.
<v Speaker 3>If reality is ultimately described by a mathematical system, there
<v Speaker 3>might be physical truths, constants, or laws that are absolutely true,
<v Speaker 3>but we can never logically derive them from the base
<v Speaker 3>axioms of our theory.
<v Speaker 2>So the final theory might be mathematically incomplete by its
<v Speaker 2>very definition. We could stare at the perfect equation forever,
<v Speaker 2>and we would never be able to mathematically prove it's
<v Speaker 2>the only.
<v Speaker 3>Right one exactly, and beyond the math, there is a
<v Speaker 3>brutally practical wall the scale problem.
<v Speaker 2>Right testing this stuff.
<v Speaker 3>Are arguing about vibrating strings and quantum loops that exist
<v Speaker 3>at the plank length that is ten to the negative
<v Speaker 3>thirty five meters.
<v Speaker 2>It is absurdly small, and to probe things that are
<v Speaker 2>that small you need incredibly high energy.
<v Speaker 3>High frequency means high energy. To build a particle accelerator
<v Speaker 3>powerful enough to actually see a string directly, you wouldn't
<v Speaker 3>just need something the size of the large Hadron collider.
<v Speaker 3>You would need a collider roughly the size of the
<v Speaker 3>Milky Way galaxy.
<v Speaker 2>I'm pretty sure we can't get the funding for a
<v Speaker 2>galaxy sized machine anytime soon.
<v Speaker 3>It is completely physically impossible for us, which raises a
<v Speaker 3>really uncomfortable question for the field. If a theory can
<v Speaker 3>never ever be physically tested, is it still physics or
<v Speaker 3>have we just crossed the border into pure metaphysics. String
<v Speaker 3>theory is mathematically beautiful, but if it requires a galaxy
<v Speaker 3>sized collider to prove it might permanently remain philosophy.
<v Speaker 2>Speaking of philosophy, I really want to dig into this
<v Speaker 2>section the text has on emergence, because let's say we
<v Speaker 2>find it. Let's say we get the God equation on
<v Speaker 2>a T shirt to actually explain everything. The hard line
<v Speaker 2>reduction ist view says, yes, biology is just applied chemistry.
<v Speaker 2>Chemistry is applied physics, and physics is just this one
<v Speaker 2>final equation.
<v Speaker 3>But we know from observation that isn't really how the
<v Speaker 3>world works. We have this phenomenon of emergence. There's a
<v Speaker 3>famous essay by Philip Anderson called More is Different, and
<v Speaker 3>the idea is that complex systems have properties that simply
<v Speaker 3>do not exist in their individual parts.
<v Speaker 2>Like you can know every single quantum property of an
<v Speaker 2>air molecule, but that knowledge will never let you predict
<v Speaker 2>a tornado, or.
<v Speaker 3>You can map every single neuron in a brain, but
<v Speaker 3>you won't find the concept of justice in there.
<v Speaker 2>Right. It reminds me of the seven forty seven analogy.
<v Speaker 2>You can't explain how a Boeing seven forty seven flies
<v Speaker 2>just by listing the quantum states of every single atom
<v Speaker 2>in the wings. You need entirely new higher level laws
<v Speaker 2>like aerodynamics that emerge at the macro scale.
<v Speaker 3>Which means a theory of everything might actually be useless
<v Speaker 3>for understanding the things we as humans actually care about
<v Speaker 3>life ecosystems. Society provides the alphabet, but it doesn't write
<v Speaker 3>the novel.
<v Speaker 2>And that brings us to the absolute biggest mystery in
<v Speaker 2>the source text, consciousness the hard problem. The text argues
<v Speaker 2>that a purely physical theory might miss the observer entirely.
<v Speaker 3>This is what philosophers call the explanatory gap. Physics is
<v Speaker 3>incredible at describing structure and function. It deals entirely with
<v Speaker 3>objective third person data wavelengths, mass, spin, velocity, right, but
<v Speaker 3>consciousness is fundamentally subjective. It's first person. Physics can describe
<v Speaker 3>the exact wavelength of red light hitting your retina, but
<v Speaker 3>it cannot explain the subjective feeling of seeing read.
<v Speaker 2>You can't squeeze a feeling out of an equation about
<v Speaker 2>electron spin.
<v Speaker 3>Many thinkers argue, you simply can't. If the final theory
<v Speaker 3>is purely structural and physical, it completely leaves out the
<v Speaker 3>inner life of the universe. And this isn't just a
<v Speaker 3>purely philosophical gripe. It crashes right back into hard physics
<v Speaker 3>with the measurement problem.
<v Speaker 2>In quantum mechanics, oh Man, the measurement problem the idea
<v Speaker 2>that the observer actually affects reality.
<v Speaker 3>Right in the standard Copenhagen interpretation of quantum mechanics, a
<v Speaker 3>particle exists in a wave function a smear of probabilities
<v Speaker 3>until it is measured. Measurement forces it to collapse into
<v Speaker 3>a single, definite state. But the math doesn't define what
<v Speaker 3>constitutes a measurement. Is it a mechanical camera, Does it
<v Speaker 3>have to be a human eye, Does it require a
<v Speaker 3>conscious mind?
<v Speaker 2>And if consciousness is required to collapse the wave function,
<v Speaker 2>then consciousness isn't just some accidental byproduct of brain chemistry.
<v Speaker 2>It is fundamental to the architecture of reality.
<v Speaker 3>And I should say most physicists strongly dislike that idea.
<v Speaker 3>Science generally wants a universe that runs perfectly well without
<v Speaker 3>us looking at it. But a true final theory has
<v Speaker 3>to account for the fact that there is a conscious
<v Speaker 3>observer asking the question if it can explain us. It's
<v Speaker 3>not a theory of everything.
<v Speaker 4>It's a theory of everything except us exactly. Before we
<v Speaker 4>wrap up, I have to touch on what I thought
<v Speaker 4>was the wildest concept in this whole test principle, because
<v Speaker 4>reading this felt like we were crossing into simulation.
<v Speaker 2>Theory.
<v Speaker 3>It is a radical shift. It actually comes from the
<v Speaker 3>study of black hole thermodynamics. Stephen Hawking and Jacob Beckinstein
<v Speaker 3>made this astonishing realization. They found that the total amount
<v Speaker 3>of information or entropy that a black hole can contain
<v Speaker 3>is proportional to its surface area, not its volume.
<v Speaker 2>Which is super counterintuitive. Usually, if you fill a physical
<v Speaker 2>box with stuff, the amount of stuff you can fit
<v Speaker 2>depends on the three D volume.
<v Speaker 3>Of the box, right, But for black holes, all the
<v Speaker 3>information about what fell in is encoded on the two
<v Speaker 3>D surface of the event horizon. This blue physicists' minds
<v Speaker 3>and led to a broader idea. What if our entire
<v Speaker 3>three D universe is actually just a projection of information
<v Speaker 3>encoded on a distant two dimensional boundary.
<v Speaker 2>Literally like a hologram on a credit card. It looks
<v Speaker 2>fully three D when the light hits it, but the
<v Speaker 2>actual data generating that image is entirely two D.
<v Speaker 3>Yes, and it implies something profound. It implies that at
<v Speaker 3>the absolute most fundamental level, reality isn't made of matter,
<v Speaker 3>It's not made of strings or loops, it is made
<v Speaker 3>of information quibbits.
<v Speaker 2>So the final theory might not even be a physics equation,
<v Speaker 2>it might look more like a computer program.
<v Speaker 3>Or pure information processing logic. It completely shifts the paradigm.
<v Speaker 3>We've spent a century looking for fundamental particles, but maybe
<v Speaker 3>we should have been looking for bits.
<v Speaker 2>So looking at everything we've covered, we have theories that
<v Speaker 2>contradict each other, math that might be fundamentally incomplete, multi
<v Speaker 2>dimensional landscapes we can't test, and a universe that might
<v Speaker 2>just be a giant hologram. Are we just chasing a
<v Speaker 2>ghost here?
<v Speaker 3>I think we have to honestly face the possibility of
<v Speaker 3>infinite regress. It's like a child's game of asking why.
<v Speaker 3>Let's say we find the absolute final physical law. The
<v Speaker 3>very next question human beings will ask, is, well, why
<v Speaker 3>that law and not another one? The law cannot explain
<v Speaker 3>its own existence.
<v Speaker 2>It just becomes a brude fact, because I said so.
<v Speaker 2>In science hates brute facts. We always want reasons. But
<v Speaker 2>at the very bottom of the a rabbit hole, there
<v Speaker 2>might not be an equation. There might just be mystery.
<v Speaker 3>But the search itself, you would argue, the search has
<v Speaker 3>immense value, right, even if we never actually catch the horizon.
<v Speaker 2>Oh.
<v Speaker 3>Absolutely, Look at the modern world, the technology we've built
<v Speaker 3>just by trying to peek at the basic rules is staggering.
<v Speaker 3>MRI machines, semiconductors, GPS, lasers, they are all byproducts of
<v Speaker 3>this pure quest for understanding. But even beyond the tech,
<v Speaker 3>it's about our place in the cosmos, where this tiny
<v Speaker 3>fragile species on a rock actively trying to decode the
<v Speaker 3>source code of reality. That is a noble pursuit. Even
<v Speaker 3>if we ultimately fail to find the final line of.
<v Speaker 2>Code, it's the journey, not the destination.
<v Speaker 3>As cliche as it sounds, yes, because think about it.
<v Speaker 3>If we actually found the final answer, if we printed
<v Speaker 3>it on that T shirt, improved it, fundamental physics would
<v Speaker 3>essentially end. It's the mystery that keeps the human intellect alive.
<v Speaker 2>I love that. And the end today's deep dive. I
<v Speaker 2>want to leave you the listener with one final thought
<v Speaker 2>inspired by the end of the text. It's a concept
<v Speaker 2>called metaphysical naturalism, basically the unstated assumption that our entire
<v Speaker 2>modern scientific world operates under the belief that absolutely everything
<v Speaker 2>in existence can eventually be reduced to and explained by
<v Speaker 2>physical laws. But what if that assumption is just a
<v Speaker 2>lens we are wearing right?
<v Speaker 3>What if reality contains layers like objective moral value meaning
<v Speaker 3>or the purely subjective experience of consciousness that simply do
<v Speaker 3>not map onto physical mathematics. You can't weigh the concept
<v Speaker 3>of justice, you can't measure the angular momentum of love.
<v Speaker 3>If those things are real, fundamental properties of the universe,
<v Speaker 3>then a purely physical theory of at everything will always,
<v Speaker 3>by definition be incomplete.
<v Speaker 2>It would be like trying to fully explain a masterpiece
<v Speaker 2>painting by only analyzing the chemical composition of the paint.
<v Speaker 2>You'd have all the data, but you would miss the
<v Speaker 2>picture entirely.
<v Speaker 3>And that, I think is exactly why we will always
<v Speaker 3>keep looking.
<v Speaker 2>Well, my brain is suitably twisted into a ten dimensional
<v Speaker 2>Colobbio manifold at this point. Thank you for walking us
<v Speaker 2>through this labyrinth today.
<v Speaker 3>Always a pleasure to get completely lost in the cosmos
<v Speaker 3>with you.
<v Speaker 2>And to you listening, Keep asking why, even if the
<v Speaker 2>answer turns out to be just another question. We'll see
<v Speaker 2>you in the next deep dive.