From symmetry to the Standard Model

46:15where am I going where from where I went to? >> It's it's flat. There's no dimensionality. >> Yeah. There's no it's just there's nothing tricky about it. But when it comes to axial vectors like angular momentum, those things do not flip. >> That's it's it's I'm like I have so many thoughts. >> Yeah, [laughter] it's crazy, dude. So this this but this is central to the idea. Okay, some vectors >> change, other vectors do not. When it comes to par in the mirror world, right? If my angular momentum is >> that way, in the mirror world, it's also going to be that way. On the other hand, my position, if my position is is this way, the the the guy is coming at me,

46:55right? If if if I have like uh a bug that's flying away from me towards the mirror, >> Mhm. >> then that bug is flying towards me out of the mirror. >> Yes. >> So, the position vector is flipped. >> Mhm. >> But if my bug is like rotating like this, >> it's going to be coming towards me, but it's going to be rotating >> like like you know. So, so the position is but but it's still going to be rotating in that same clockwise way. >> Yes. Yes. Yes. And that it's actually like really trippy to think about. >> It's really trippy to think about, dude. It Yeah. This this Okay, I'm tracking, you know. >> No, no. I mean, this a total side note to this, but this kind of reminds me.

47:35It's not similar, but there's like this whole there's this gentleman who's created this thing called the true mirror because we're seeing a a reflection a mirrored version of ourselves when we look in a mirror >> versus what other people see when they look at us. >> Yeah. >> And there's actually this like physiological response that we as humans have when we see a mirror reflection of ourselves versus like what other people see of ourselves. And so like you because like like your brain processes the mirror image in a certain way. >> And so when you see it in the opposite there's like these outcomes like oh you tend to like not be searching gazing in

48:16the eye like trying to find the ey line. You naturally like are not uncomfortable and smile like there's this whole like arena of stuff. It's not the same thing, but it makes me think about that use case because I've never before thought about the idea that the way people see me in the world >> is not the same thing that I see in the mirror. >> No. >> And so everyone sees me the reverse of how I think my existence is. >> Yes. Yes. >> And that's very weird. >> Yeah. They're seeing just like I guess you I don't know. It's there's no flipping. >> There's no flipping. >> There's no flipping because flipping is a crazy thing, right? You're flipping axes and all this other But if I was like having angular momentum towards people towards [laughter] anyway.

48:57>> Yeah. Yeah. Yeah. Yeah. Exactly, dude. It's crazy. >> It's crazy to think about. But but my my main point here was some vectors like my velocity. >> Yes. >> Like my position, those are true vectors. Those are going to flip sign. >> Yes. >> My angular momentum is not going to flip sign. Right. >> Okay. Right. Now you know we start getting these weird experiments from um Otto Leaport. He's a student of Somfeld. Serrfeld we've talked about at the University of Munich. One of the great um physicists of Germany before the war who >> tutored the likes of Heisenberg and Powi and all these people. Never got the

49:37Nobel Prize. But he showed in experiments with iron that if you have, you know how like in quantum mechanics you have transitions between energy