Sean Carroll

speaker

26,951 appearances 50 recordings 4 series first heard Apr 2024 last heard yesterday

Sean Carroll’s voice in public audio — every appearance, attributed to the second.

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Recordings per month over the last 12 months — 30 in all, peaking in Jun 2026 with 6.

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Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas · Mindscape Ask Me Anything, Sean Carroll | September 2026 · 14 Sep 2026 podcast

So it's not, again, and that's a four kilometer long tube. podcast-host

You're not going to carry around a four kilometer long tube in your pocket either. podcast-host

So just as a practical reason, as a practical matter, it just doesn't work. podcast-host

But there's another the other aspect, which again is equally important. podcast-host

is that for electromagnetism there are positive and negative charges. podcast-host

For gravity, there's essentially only positive charges, okay? podcast-host

Because mass is the or energy, if you want, is what generates gravitational fields. podcast-host

And mass is positive. podcast-host

You don't get negative mass particles generally. podcast-host

A modulo of what we just talked about, they can flicker into existence momentarily, but you don't have a negative mass particle just sitting there in front of you. podcast-host

And what that means is that you can't cancel out the gravitational field and manipulate it in very, very fine ways, like you can an electromagnetic field. podcast-host

A radio, or the computer in front of me, is this intricate dance of all sorts of positively charged and negatively charged particles constantly manipulating electromagnetic fields by canceling them out, generating podcast-host

them, cancelling them out again and all this stuff. podcast-host

So that's why you can do so many interesting things with electromagnetism, because you can manipulate it in sort of pinpoint ways. podcast-host

Gravity is dumber than that. podcast-host

All you can do is make it, right? podcast-host

If you have two one kilogram masses and you bring them together, you have a two-kilogram mass. podcast-host

That's it. podcast-host

There's nothing else you can do. podcast-host

You can't manipulate the inside of your masses to make it seem like it's less than two kilograms or anything like that. podcast-host

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