
20221019: The Equation That Explains (Nearly) Everything!
 03:36: ... or system travels through the space of all possible quantum states. For classical physics it simplifies to just Kinetic Energy minus Potential ...
 08:23: ... which we add to the kinetic term. Here we see a connection to the classical Lagrangian, with is kinetic and potential ...


20221012: The REAL Possibility of Mapping Alien Planets!
 19:23: ... constant represents the strength of electromagnetism, and the classical equation for electrostatic force  coulomb’s law  has charge ...


20220803: What Happens Inside a Proton?
 12:15: ... looks like a crystal  admittedly a 4dimensional one, but a classical crystal. And guess what  we understand how crystals ...


20220727: How Many States Of Matter Are There?
 07:54: The states of matter we’re most familiar with can be explained as particles interacting under classical forces.


20220615: Can Wormholes Solve The Black Hole Information Paradox?
 07:24: ... according to the laws of physics. In a way, the “classical” and sensible path that we observe is the sum of infinite paths, ...
 09:17: ... wormholes. Even though these wormholes don’t really exist in a classical sense, the fact that they can possibly exist in ...


20220216: Is The Wave Function The Building Block of Reality?
 00:03: ... But there’s one explanation that feels as down to earth as the classical world that we’re trying to explain. Let’s see if it actually makes ...
 01:24: ... and the cat is alive or dead, not alive and dead. The quantum becomes classical at some point between the subatomic and the ...
 06:04: ... why subatomic systems could be quantum but large systems were always classical. ...
 07:17: ... involved. Small things can stay quantum, but the chance of collapse to classicality increases with size, and big things are essentially never ...
 08:55: ... two mysteries of physics. 1. What causes the transition from quantum to classical? And 2. Why can’t gravity be quantized like the other forces. All of the ...
 09:25: ... and the gravity of the system will cause it to rapidly decohere into a classical object. Instead of gravity being quantized, Penrose’s theory predicts ...


20220127: How Does Gravity Escape A Black Hole?
 08:39: ... to our last argument, and this one works whether we’re talking about the classical gravity of Einstein or some deeper theory of quantum ...


20220112: How To Simulate The Universe With DFT
 05:52: ... by thinking about the completely solvable case of many nonquantum or classical ...
 06:37: ... for the classical case we can throw away most of configuration space and consider just the ...


20211220: What Happens If A Black Hole Hits Earth?
 17:55: ... merge should look almost exactly the same as those produced when classical black holes merge. Emphasis on the ...


20211117: Are Black Holes Actually Fuzzballs?
 09:02: Rather it would grow to produce an agglomerate of strings with the same radius as a classical black hole.
 11:02: All classical effects of black holes from general relativity would be preserved.


20211110: What If Our Understanding of Gravity Is Wrong?
 02:52: ... curvature in the fabric of space and time rather than just as a classical ...


20211102: Is ACTION The Most Fundamental Property in Physics?
 05:24: ... Well, if it really is so fundamental then it should apply well beyond classical mechanics and into our modern theories  in particular general ...
 08:06: ... of a Principle of Least Proper Time. The reason for this is that in the classical limit proper time becomes kinetic minus potential energy for objects ...
 09:56: ... action varied slowly  near it’s stationary points, just like with classical ...


20211020: Will Constructor Theory REWRITE Physics?
 08:20: ...  must differ from regular information media, which would be purely classical. ...
 08:34: For example, for systems of quantum information there’s a particular task that is possible that is impossible for classical systems.


20211013: New Results in Quantum Tunneling vs. The Speed of Light
 01:48: Well, nothing in the laws of classical physics anyway.


20211005: Why Magnetic Monopoles SHOULD Exist
 01:11: ... according to classical electromagnetism, it doesn’t matter how many times you slice it  you’ll ...
 02:06: And according to classical electrodynamics, moving electric charge is the source of the magnetic field.
 02:18: Well, according the classical theory we shouldn’t.
 04:21: At least according to classical theory.


20210921: How Electron Spin Makes Matter Possible
 05:59: ... of this to actual electrons? Well electrons don’t really rotate in the classical sense. They’re quantum objects described by a quantum wavefunction. A ...


20210707: Electrons DO NOT Spin
 01:26: ... a very strange type of angular momentum that somehow exists without classical rotation. In fact the spin of an electron is far more fundamental than ...
 02:25: ... This Zeeman effect was explained by Lorentz himself with the ideas of classical physics. If you think of an electron as a ball of charge moving in ...
 03:48: ... are pointlike  they have zero size, which would make the idea of classical angular momentum even more nonsensical. Pauli rejected the idea of ...
 05:37: ... field will be deflected by the most  either up or down. If these were classical dipole fields  like actual tiny bar magnets  then the ones that were ...
 06:36: ... of SternGerlach magnets, but now they’re oriented horizontally. Classical dipoles that are at 90 degrees to the field would experience no force ...
 11:09: ... way to think about the angular momentum of an electron is not from classical rotation, but rather from the fact that they have a ...
 14:32: ... environment with the environment. On the other hand, classical or thermodynamic entropy represents information that is hidden ...


20210623: How Quantum Entanglement Creates Entropy
 02:34: ... a full playlist on the mysteries of what I’ll call classical entropy and its relationship to information. But let’s run through ...
 05:55: ... and it can also be used to determine how many bits of classical information we can get out of the system when we make a ...
 07:44: ... heads 50% tails. This is subtly different to the state of a classical coin being either heads OR tails, with a 50% chance of ...
 10:23: ... each separate entangled quantum coin behaves kind of like a regular classical coin  for example it doesn’t by itself exist in a ...
 11:00: ... is the first step in the transition between the quantum and classical world. Our capacity to observe quantum effects like ...
 11:50: ... at it this way, our classical coin is just like our isolated entangled coin. Except now ...
 13:09: ... the 2nd law of thermodynamics AND the emergence of the classical world from the quantum. And, as an extra trick, it also ...


20210519: Breaking The Heisenberg Uncertainty Principle
 03:31: ... neither  rather, there are the impressions we receive as largescale, classical ...
 03:45: A quantum object can project its nature up to our classical world in one way or another, but not both.


20210421: The NEW Warp Drive Possibilities
 11:07: Both of these papers are peer reviewed and published in the reputable journal Classical and Quantum Gravity.


20210407: Why the Muon g2 Results Are So Exciting!
 03:50: Here's the equation for the classical dipole moment for a nonquantum rotating charge.
 04:07: But the electron dipole moment is different from the classical one by this factor g.
 04:15: So the electron responds to a magnetic field twice as strongly compared to what you'd expect for an equivalent classical rotating charge.


20210309: How Does Gravity Affect Light?
 09:17: ... two completely crazy assumptions  first that light acts like a very classical, 17thcentury style plane wave so you can use Huygens' ...


20210112: What Happens During a Quantum Jump?
 04:45: He believed it all came down to waves—and that nothing was particularly special about these waves compared to any other kind of classical wave.
 04:54: He argued that most “spooky” quantum phenomena could be explained by classical resonance phenomena.


20201222: Navigating with Quantum Entanglement
 00:00: ... mechanics as only affecting only the smallest scales of reality, with classical reality taking over at some intermediate ...


20201215: The Supernova At The End of Time
 03:37: The new science of quantum mechanics had shattered our classical understanding of the world in many ways.


20200928: Solving Quantum Cryptography
 00:58: ... secrets are safeish for now because the most powerful classical computers will take thousands to billions of years to find those ...
 01:23: ... just last year, Google’s quantum computer, Sycamore, outsped the best classical computers for a very specific ...
 01:33: ... system exponentially faster than would have been possible with a pure classical ...
 04:40: ... you try prime factorization using a classical computer you’re stuck using an algorithm similar to one that was ...
 06:21: It would take at least as long, or require at least as many parallel classical computers.
 06:30: Classical computers store information in bits that are either 0 or 1.
 07:23: ... guesses but it’s no more likely to be the correct one than if you used a classical ...
 12:45: So far there’s no known classical or quantum algorithm that solves it quickly for large lattices.
 12:58: ... is whether these algorithms are really robust against quantum and classical ...
 13:44: In fact, there’s no guarantee a classical computer won’t come up with a fast algorithm to solve them.


20200817: How Stars Destroy Each Other
 03:30: They result when denser streams of matter hit the white dwarf and flare due to heat, but do not produce the storm of fusion of the classical nova.
 03:40: But as Dr Shara discovered, it turns out that dwarf novae are just what classical nova do between those bigger explosions.
 03:57: That placed it exactly where those royal astronomers saw their classical nova.
 04:21: 50 or so classical novae go off in our galaxy every year.


20200728: What is a Theory of Everything: Livestream
 00:00: ... who um who i'm also musicians so you know i was just i'm a big fan of classical indian music i have friends who you know their approach to playing ...


20200622: Building Black Holes in a Lab
 09:19: ... useful as classical analogs are, Hawking radiation is ultimately a quantum mechanical ...


20200511: How Luminiferous Aether Led to Relativity
 03:25: ... pattern in the density of the air. All familiar waves  what we’ll call classical waves  are a chain reaction that propagates an energy pattern through ...
 06:22: ... bow on it by demonstrating the existence of the luminiferous aether as a classical medium for the propagation of ...
 06:48: ... classical waves travel at a constant speed relative to their medium. For example, ...
 07:19: ... I’d wanna hope Galilean relativity is right OK, so if light is a classical wave in some medium then we should see changes in the apparent speed of ...
 11:04: ... to be no luminiferous aether  at least, not one that resembled a classical medium for wave propagation. The speed of light appeared to be ...
 12:25: ... that the aether is disproved  but let’s be clear. The aether as a classical medium for light is dead. However the general concept of the aether sort ...


20200316: How Do Quantum States Manifest In The Classical World?
 00:20: ... states at once  what we call a “superposition” of states." But in the classical world of large scales, things are either this or that. The famous ...
 01:48: ... quantum world can survive this decoherence and become manifest in the classical world. To get the entire answer, we need to think about quantum ...
 03:12: ... NOT find that there’s zero spin in that direction, as you’d expect for a classical spinning object. Instead the electron will randomly shift ot having left ...
 18:58: ... declines our offer of quantum immortality, saying "I'll stick with classical immortality, thank you". thanks for commenting Keith Richards, I hope ...


20200224: How Decoherence Splits The Quantum Multiverse
 00:29: Sure  but it’s also the elusive dividing line between the quantum and classical worlds.


20200218: Does Consciousness Influence Quantum Mechanics?
 03:34: ... collapse seems essential because our largescale, classical world isn’t made of probability clouds, it’s made of objects with ...
 03:45: So when does the quantum transition to the classical actually happen?
 05:42: With no clear boundary between the quantum and the classical, where does the collapse of the wavefunction happen?


20191015: Loop Quantum Gravity Explained
 03:33: ... classical physics, we have variables like position, time, momentum, energy  ...
 11:54: ... old general relativity on large, nonquantum scales  in the socalled classical ...


20190715: The Quantum Internet
 00:43: ... these processes work in the realm of classical cryptography, but one day soon this may not be enough and so quantum ...
 01:09: ... storage, and transmission of information, typically in the form of classical bits, 1’s and ...
 01:49: Quantum information theory parallels classical information theory, but instead of using classical bits, it deals bits of quantum information  qubits.
 02:53: ... for sharing cryptographic keys that should be far more secure than classical ...
 03:34: ... transfer classical information using light, each bit is encoded with many photons, and many ...
 05:21: ... communication nor teleportation of actual matter, because a classical, sublightspeed channel is still needed to extract the ...
 05:41: Think of it this way: Two people, let’s say Bill and Ted, are connected by a classical channel and a quantum channel.
 05:49: ... classical channel can be anything  a fibre optic cable, a telephone wire, the ...
 07:44: This measurement outcome is encoded in two classical bits which Bill sends to Ted along the classical channel.
 09:45: ... entangled qubits, which they could use to communicate by exchanging classical Bell measurement ...
 10:52: We currently live in the information age, but it’s a classical information age.


20190516: The Cosmic Dark Ages
 13:07: ... mechanics. One thing I learned is that you guys already know a lot about classical encryption. You dropped a bunch of knowledge  let's see what you had to ...
 14:38: ... relays are weak points, especially if the states revert to classical information while being boosted. We'll talk about quantum relays in an ...


20190509: Why Quantum Computing Requires Quantum Cryptography
 01:12: This allows the iterations of certain types of calculation to be done in parallel, and vastly more quickly than in a classical computer.
 01:33: For the best description of classical internet cryptography … on the internet … head to Infinite Series.
 02:57: At least as long as we're limited by classical computing.
 10:29: But there are classical authentication methods that can make this very difficult.
 13:03: For now, the classical internet is still moderately safe – or at least it’s biggest vulnerability is human stupidity.
 13:16: But come quantum computers even the smartest classical security protocols will be compromised.


20190313: Will You Travel to Space?
 12:52: ... gives a complete breakdown of songs and artists in every genre from pop, classical, rap, jazz, electronic, country, rock, and more. And this week they have ...


20190306: The Impossibility of Perpetual Motion Machines
 06:30: Indeed there are ideal systems that, from pure classical principles should run forever.


20181212: Quantum Physics in a Mirror Universe
 00:02: ... that comes to mind is mirror symmetry butterflies Rorschach tests and classically attractive faces all look the same when flipped left to right in physics ...


20181107: Why String Theory is Right
 05:54: ... quantization I mean taking a classical largescale description of something like a ball flying through the air ...
 06:05: ... do this, you basically take the classical equations of motion and follow a standard recipe to turn them into wave ...


20180920: Quantum Gravity and the Hardest Problem in Physics
 08:10: For example, classical electromagnetism becomes quantum electrodynamics when you quantize the electron field and the electromagnetic field.


20180823: How Will the Universe End?
 13:55: ... that the gfactor of the electron should have been equal to 1 in the classical case and 2 in the quantum ...
 14:35: Classically, we assumed the electron was a ball of charged stuff, hence g equals 1.
 14:59: That's the classical theory, which is wrong and also suggested that electrons should spin faster than light.


20180815: Quantum Theory's Most Incredible Prediction
 01:28: ... than the simple opposite charges attract, like charges repel of classical ...
 01:41: Well, because it makes some predictions that clash with the classical theory.
 04:12: Despite not being the same as classical rotation, this quantum spin does grant electrons a dipole magnetic field.
 05:09: ... electron, you get almost exactly twice the value you'd expect for a tiny classical sphere with the same charge and angular momentum as an ...
 05:23: This difference between the quantum versus classical magnetic moments for the electron is called the G factor.
 05:30: It's the number you need to multiply the classical value by to get the right answer.
 06:09: ... interact with an electromagnetic field, it still treats this EM field classically. ...


20180718: The Misunderstood Nature of Entropy
 07:20: ... pressure, density, volume, et cetera have the values we expect from classical ...


20180620: The Black Hole Information Paradox
 13:53: ... we talked about a black hole's electric charge in terms of the classical electromagnetic field which has an existence independent of electric ...


20180613: What Survives Inside A Black Hole?
 05:41: In fact, it's one of Maxwell's equations, which together give the classical description of electromagnetism.


20180523: Why Quantum Information is Never Destroyed
 00:36: Newton's equations for classical mechanics, Maxwell's equations for electromagnetism, and the Schrodinger equation for quantum mechanics.


20180516: Noether's Theorem and The Symmetries of Reality
 06:43: ... action can be used to derive the laws of motion from the equations of classical mechanics to Feynman's path integral formulation of quantum ...


20180418: Using Stars to See Gravitational Waves
 09:10: ... a series of courses that will guide you stepbystep from the basics of classical mechanics through the intricacies of Newtonian ...


20180404: The Unruh Effect
 09:46: ... observe Unruh particles, although analogies have been observed even in classical systems, like this really cool study with water ...


20171129: Citizen Science + ZeroPoint Challenge Answer
 00:33: ... trade, a classically trained musician, but as an amateur astronomer, he discovered Uranus and ...


20171102: The Vacuum Catastrophe
 04:12: In fact, in both quantum mechanics and classical mechanics, a particle's equations of motion depend only on changes in energy.


20170712: Solving the Impossible in Quantum Field Theory
 01:38: In oldfashioned classical electrodynamics, we think of each electron as producing an electromagnetic field.


20170707: Feynman's Infinite Quantum Paths
 04:39: And it was borrowed from oldschool classical physics.
 05:06: For the largescale classical universe, minimizing proper time lets you derive all equations of motion.
 07:34: The familiar paths of the largescale classical world are just the small set of infinite possible paths that don't cancel each other out.


20170315: Time Crystals!
 08:34: ... is to use electron spins, which can represent the ones and zeros of a classical computer in the updown direction of the ...


20170111: The EM Drive: Fact or Fantasy?
 08:18: ... the quantum vacuum is some sort of almost classical medium, then they argue that the EmDrive could push off it, leaving a ...


20161221: Have They Seen Us?
 17:14: It's a useful classical simplification in both cases.


20161130: Pilot Wave Theory and Quantum Realism
 02:16: ... together in the '20s, they were fervent about the need to reject all classical thinking in interpreting the strange results of early quantum ...
 11:50: And I think we need to be dubious about that sort of classical bias.


20161026: The Many Worlds of the Quantum Multiverse
 00:09: A huge outstanding question is when and why does the weirdness of quantum mechanics give way to classical physics.
 02:19: That collapse signifies the transition between the quantum and classical realms.
 05:06: However, there is another way to interpret the transition between the quantum and classical worlds.


20160921: Quantum Entanglement and the Great BohrEinstein Debate
 01:04: ... looking at it is a pretty fundamental implied assumption behind all of classical ...


20160622: Planck's Constant and The Origin of Quantum Mechanics
 06:11: It was catastrophic because it meant that something was fundamentally wrong with the classical physics that went into the RayleighJeans law.
 06:19: The problem turned out to be that in classical physics, everything can be infinitely divided.


20160615: The Strange Universe of Gravitational Lensing
 11:28: The idea is that a physical system doesn't have the familiar classical properties like position, momentum, spin, et cetera, until it is observed.
 12:39: ... means doing something to it that collapses its wave function into the classical physical properties like position and ...


20160525: Is an Ice Age Coming?
 14:32: But, for example, a stress energy momentum pseudo tensor isn't mathematically the same thing as classical energy.


20160217: Planet X Discovered?? + Challenge Winners!
 03:37: The relativistic Doppler effect classically changes the wavelengths of light, blueshifting approaching material and redshifting receding material.


20150819: Do Events Inside Black Holes Happen?
 00:13: [THEME MUSIC] Today's episode, we'll only talk about black holes from the perspective of classical general relativity.


20150805: What Physics Teachers Get Wrong About Tides!
 10:44: ... can quantize any classical theory, as long as you are restricting yourself to looking at ...
 11:41: ... the other is to try to take field classical field theory versions of something and then add to them the machinery of ...


20150513: 9 NASA Technologies Shaping YOUR Future
 01:37: A downloadable insomnia app called Sleep Genius that combines that vibration research with classical music.
