Do We Live In a Multiverse? - video Dailymotion

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Astrophysicist Paul Sutter explains

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00:00Do we live in a multiverse?

00:03No.

00:04I mean, yes.

00:07I mean, maybe.

00:09Look, it's kind of complicated and we're not exactly sure.

00:14I'm Paul Sutter and this is Paul Explains, the show where I, you know, explain.

00:21First, let's define what we mean by multiverse.

00:24We have the universe, which is by definition all the things.

00:30It's all the stars, all the planets, all the people and aliens.

00:34It's all the bits of fluff just floating around in the void.

00:37It is the entire thing.

00:40It's all the stuff.

00:43So in one sense, there's no such thing as the multiverse because the universe is already

00:47defined to be all the things.

00:50But maybe there are patches of the universe that have different physics or different realities.

01:00They have different forces or different particles and this is what we refer to as the multiverse.

01:09Now do we live in a multiverse?

01:12Maybe, maybe not.

01:15One of the most promising ways physically to get a multiverse is through something called

01:22inflation.

01:24Inflation is our model of one of the earliest and most momentous events in the history of

01:30the universe.

01:32In the inflation model, when our universe was barely getting started, when it was a billionth

01:38of a billionth of a billionth of a billionth of a second old, it became very large.

01:45It went from the size of, say, an atomic nucleus to around the size of a baseball.

01:51And this event has the possibility of never ending.

01:58Of inflation of the universe just always getting bigger and bigger and bigger all the time.

02:05And what we call the universe is just one small pocket of that much larger volume of the true

02:14universe.

02:15And in our little pocket, when inflation ended for us, we ended up with one set of physics

02:21and one set of forces and one set of particles and one set of reality.

02:26But past the confines of our little bubble, the greater universe is still going, still doing

02:34its thing, still inflating, and different pieces of it pinch off on their own with their

02:39own physics.

02:41Now, it's possible that inflation can lead to a multiverse.

02:48We don't know if inflation really happened.

02:50We suspect it did, but we're not entirely sure.

02:54And we're not sure if inflation demands the existence of a multiverse.

02:59It's possible that inflation just happened once and did it throughout the universe and

03:04that this is it.

03:07Or not.

03:08We've looked for evidence for a multiverse and have come up short.

03:13Like if another neighboring universe intersects with the bubble of our universe, we might

03:19be able to see signals of that.

03:22And we haven't seen anything.

03:24That doesn't rule it out yet, but there's no conclusive evidence for it.

03:30Even if there were a multiverse, we would never ever be able to access any of those other

03:35universes.

03:36We wouldn't be able to visit them.

03:38They wouldn't be able to visit us.

03:40For all intents and purposes, they wouldn't exist.

03:44So when it comes to multiverse, whether it exists or not, just focus on our universe because

03:51really, it's the only one we got.

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