
20220928: Why Is 1/137 One of the Greatest Unsolved Problems In Physics?
 05:14: ... they can interact in many different ways, which we can visualize with Feynman Diagrams. ...
 06:02: ... a photon, or in the case of two electrons interacting by, say Feynman diagrams  it’s the base probability at each vertex, each interaction between ...


20220914: Could the Higgs Boson Lead Us to Dark Matter?
 02:10: We can bundle the different methods into three broad categories, each represented by a different Feynman diagram.
 02:17: ... Feynman diagram is just a way to represent the interactions of particles, plotting time ...
 03:35: The second family of experiments, indirect detection, can be represented by rotating our Feynman diagram.
 04:41: OK, let’s try rotating our Feynman diagram one more time.


20220803: What Happens Inside a Proton?
 03:12: ... Each family of interaction types is represented by a Feynman diagram, and quantum electrodynamics gives us a recipe book for ...
 04:17: ... include the simplest few levels. Each pair of vertices on a Feynman diagram represents the probability of a pair of electrons interacting with the ...
 05:31: ... photons of the electromagnetic field. We can draw Feynman diagrams of these interactions, now with curly gluon lines. ...
 06:02: ... have the luxury of throwing away all but the simplest Feynman diagrams when you’re calculating the interaction probability for your pair ...
 06:37: ... In fact it’s extremely challenging to do QCD with the Feynman diagram approach even with computers. Now Before any ...
 07:07: ... quarks, how can we even test the theory? Well, we need to abandon Feynman diagrams. In fact, we need to abandon the idea of particles altogether. See, ...
 07:53: ... the course of a strong force interaction. Similar to how Feynman diagrams work, to do this you need to account for all possible paths ...
 08:30: ... could do that even given the entire life of the universe. For QED, Feynman diagrams let us reduce the number of field configurations by ...
 08:58: ... now. Every time you add the probability for a single Feynman diagram you’re actually adding infinite possible trajectories using ...


20211210: 2021 End of Year AMA!
 00:02: ... between two particles whether they're repelled or attracted using feynman diagrams okay so what you do is you sum over you add over all the possible ways ...


20210407: Why the Muon g2 Results Are So Exciting!
 05:02: We depict these interactions in Feynman diagrams.
 05:05: Each Feynman diagram represents one family of ways that the interaction could proceed.
 05:10: And the sum of all possible Feynman diagrams, gives you the interaction strength.
 05:14: For a deeper dive in Feynman diagrams, virtual particles, and quantum electrodynamics, we have you covered, episode list in the description.
 05:23: We can represent an electron interacting with a magnetic field, with the simplest possible Feynman diagram.
 05:29: Really not even a full Feynman diagram.
 06:12: Each layer of complication involve many more Feynman diagrams, but also added less and less to the interaction.
 06:19: The latest calculations rely on powerful computers to add many thousands of Feynman diagrams, and get us our gfactor to 12 significant figures.
 07:36: So you add up all of the Feynman diagram to all possible electromagnetic interactions of the muon, but you don't stop there.


20201208: Why Do You Remember The Past But Not The Future?
 04:34: We’re showing this in the style of a Feynman diagram.
 05:48: We can see that when we flip the Feynman diagram on its head  it's symmetric.
 06:02: ... “Feynman diagram” of our asteroid looks like countless particles coming together in many ...


20200127: Hacking the Nature of Reality
 07:23: But in order to avoid those sums of Feynman diagrams, Smatrix theory also relies on symmetries between those virtual interactions.
 07:36: ... matter traveling backwards in time  that folds together large sets of Feynman diagram and helps us ignore the actual causal structure within the interaction ...


20190116: Our Antimatter, Mirrored, TimeReversed Universe
 10:26: ... it's essential to his path integral approach to quantum mechanics and to Feynman diagrams maybe that's why he was so into building antimatter clocks. So, yeah the ...


20181031: Are Virtual Particles A New Layer of Reality?
 04:33: Maybe you recognize these things Feynman diagrams.
 04:58: ... Feynman diagrams are an absolutely essential tool in most modern quantum field theory ...
 08:22: In fact, you only see that force in the sum of all possible virtual photons over all possible Feynman diagrams.


20180815: Quantum Theory's Most Incredible Prediction
 08:08: In particular, we've been at Feynman diagrams, which are our best tool for dealing with the absurd complexity of quantum fields.
 08:30: A basic interaction of an electron with an EM field is illustrated by this partial Feynman diagram.
 10:18: For each new degree of precision, the number of Feynman diagrams needed explodes.


20180620: The Black Hole Information Paradox
 14:28: Check out our episode on the path integral and Feynman diagrams for more info on this wackiness.


20171019: The Nature of Nothing
 04:41: Virtual particles are the links governing all particle interactions in the famous Feynman diagrams.


20170816: Extraterrestrial Superstorms
 11:50: Last week, we talked about John Archibald Wheeler's one electron universe idea as well as gave the solution to the Feynman diagram challenge.


20170810: The OneElectron Universe
 06:22: ... field theory calculations, because it massively cuts down the number of Feynman diagrams you ...
 07:18: ... we draw a Feynman diagram for the whole universe, we can have only one electron undergo countless ...
 09:13: ... nature of antimatter, let's go back and look at the solution to the Feynman diagram challenge ...
 09:22: ... scatter off each other using the simple rules I laid out for building Feynman diagrams. ...


20170802: Dark Flow
 09:54: Last week, we talked about the actual rules by which Feynman diagrams can be used to describe real interactions in quantum electrodynamics.
 10:04: ... couple of you pointed out that the Feynman diagram vertex, representing interactions between an electron, positron, and ...
 10:20: In fact, vertices are really just building blocks for Feynman diagrams.
 11:57: ... happens after the electron undergoes an interaction, represented by a Feynman diagram, then we need to think of that retrocausal influence as also propagating ...
 12:14: Squid Master started studying physics and got a tattoo of a Feynman diagram, then switched majors to economics.


20170726: The Secrets of Feynman Diagrams
 00:03: ... Feynman diagrams revolutionized particle physics by providing a simple system to sort out ...
 01:12: ... as we discussed in our episode on solving impossible equations, the Feynman diagrams allow physicists to quickly figure out which of the infinite ...
 01:38: The miracle of Feynman diagrams is that an absurdly simple set of rules allows you to easily find all of the important interactions.
 02:19: In Feynman diagrams, we depict the electron as an arrow pointing forwards in time, while the positron is an arrow pointing backwards in time.
 02:40: Throw these on a plot of space versus time, and we have a Feynman diagram a useless one.
 03:25: And it can be used to construct infinite Feynman diagrams.
 05:25: The overall interaction described by a set of Feynman diagrams is defined by the particles going in and the particles going out.
 07:37: Part of the beauty of Feynman diagrams is that each of these diagrams themselves represents an infinite number of specific interactions.
 09:43: These may seem like wildly different processes, but in the math represented by Feynman diagrams, they're exactly the same.
 10:02: ... fact makes Feynman diagrams an incredibly powerful tool in simplifying quantum field theory ...
 10:27: But for now, I want to give you a chance to play with Feynman diagrams yourselves.
 10:41: The most important Feynman diagrams for Bhabha scattering are the two cases involving a single virtual photon.
 11:21: Send your neatly drawn Feynman diagrams to pbsspacetime@gmail.com within one week of the release of this episode.
 11:29: Include in the subject line the words Feynman diagram challenge, because we filter by subject line.


20170719: The Real Star Wars
 16:27: When we draw the Feynman diagrams for electron scattering, we need to include separate diagrams in which the ingoing electrons swap places.
 16:37: A few of you asked why it is that each additional vertex reduces the probability contribution of a given Feynman diagram by around a factor of 100.


20170712: Solving the Impossible in Quantum Field Theory
 00:23: The most famous of these are the incredible Feynman diagrams.
 01:16: Finally, the entire mess was ordered into a system that mere humans could deal with using the famous Feynman diagrams.
 03:04: This is a good time to introduce our first Feynman diagram.
 03:18: In a Feynman diagram, one direction is the time in this case, up.
 03:38: But Feynman diagrams aren't really just drawings of the interaction.
 03:46: Each part of the Feynman diagrams represents a chunk of the math.
 05:18: And this is where Feynman diagrams start to come in handy, because they keep track of the different families of possibilities.
 06:46: Here, Feynman diagrams are indispensable.
 08:00: So with Feynman diagrams, you very quickly get an idea of which are the important additions to your equation and which you can ignore.
 08:09: Perturbation theory, with the help of Feynman diagrams, make the calculation possible, but that doesn't mean we're done.
 11:08: ... Feynman diagrams successfully describe everything from particle scattering, selfenergy ...
 11:20: We'll go further into the nuts and bolts of Feynman diagrams in an upcoming challenge episode.


20170707: Feynman's Infinite Quantum Paths
 11:12: One powerful tool in making sense of these infinite possible events also came from Richard Feynman, specifically Feynman diagrams.
