Don Lincoln explains that electroweak unification is reconciled with electromagnetism's infinite range and the weak force's tiny range by the mass difference between their force-carrying particles: the massless photon versus the massive W and Z bosons. ✦ AI generated
Don Lincoln · Lex Fridman · 2026-05-29 · original ↗
starts at this moment · 37:59
“So can you describe that unification?”
electroweak force is real. The way we make it so that there is now an electromagnetic force and a weak force is the force-carrying particle of electromagnetism has no mass. The force-carrying particle of the weak force has a mass.
verbatim transcript · starts at 37:59
37:59postulated that there was this additional field that was kind of distinct from this electroweak field, and we call it the Higgs field. And the Higgs field permeates all of space. And here's the kicker, some particles interact with the field, and some particles don't interact with the field. The ones that interact with the field get mass, and the ones that don't interact with the field don't have mass. And
38:28so that's the idea, is that the Higgs field gives the weak force particles mass. However, the photon laughs at the Higgs field, doesn't see it, and it has no mass. - And I should say here, going to Perplexity, the big-picture view, the Higgs field is the quantum field that fills all of space and gives many elementary particles, just as you're saying, their mass through their interaction with it. The Higgs boson is the particle
38:56associated with ripples or excitations of this field. In modern particle physics, every type of particle corresponds to a field that exists everywhere. The Higgs field is one such scalar field, meaning at each point in space, it has a single numerical value rather than a direction. The Higgs field differs from most other fields because even in empty space, empty in quotes, by the way, empty space, its average
39:25value is not zero. This non-zero vacuum value is what enables it to endow particles with mass. - Right. So let's talk about something a little more familiar just to try and hang some, some intuition on those words. - Mm-hmm. Awesome. - All right, so right in front of us, there is a gravitational field. Now- ... you can't see it, but right there. Right there. Check it out.
39:46- Yep. - If I were to take something, a pen or whatever, and put it there, it feels a force, and it falls. Very insightful, I know. So we have the gravity field, and we have the pen that has a mass, and the mass and the gravity field interact, and it drops. Now- ... if we had another- - I have a- - Oh, yes - ... object for you.