Astrophysicist Paul Sutter explains
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00:00 Do we live in a multiverse?
00:02 No, I mean yes, I mean
00:07 Maybe look it's kind of complicated and we're not exactly sure
00:12 I'm Paul Sutter in this is Paul explains the show where I
00:17 you know
00:20 Explain first. Let's define what we mean by multiverse. We have the universe which is by definition
00:27 All the things it's all the stars all the planets all the people and aliens
00:34 It's all the bits of fluff just floating around in the void. It is the entire thing. It's all the stuff
00:41 so
00:43 In one sense, there's no such thing as the multiverse because the universe is already defined to be all the things
00:49 but
00:51 Maybe there are
00:53 patches of the universe
00:56 That have different physics or different realities. They have different forces or different particles
01:03 And this is what we refer to as the multiverse
01:07 Now do we live in a multiverse?
01:11 Maybe maybe not
01:14 one of the most
01:16 promising ways
01:18 Physically to get a multiverse is through something called inflation
01:23 Inflation is our model of one of the earliest and most momentous events in the history of the universe
01:31 in the inflation model when our universe was
01:35 Barely getting started when it was a billionth of a billionth of a billionth of a billionth of a second old
01:42 It became very large
01:44 it went from the size of say an atomic nucleus to around the size of a baseball and
01:51 this event has the possibility of
01:55 never ending of
01:57 Inflation of the universe just always getting bigger and bigger and bigger all the time
02:03 And what we call the universe is just one small pocket of that much larger
02:11 volume of the true universe and in our little pocket when
02:17 Inflation ended for us we ended up with one set of physics one set of forces and one set of particles and one set of
02:24 reality
02:26 But past the confines of our little bubble
02:29 The greater universe is still going still doing its thing still
02:34 Inflating and different pieces of it pinch off on their own with their own physics
02:40 Now it's possible that inflation can lead to a multiverse
02:47 We don't know if inflation really happened. We suspect it did but we're not entirely sure and we're not sure if inflation
02:55 Demands the existence of a multi-use it's possible that inflation just happened once and did it throughout the universe
03:04 And that this is it
03:06 or not
03:07 we've looked for evidence for multiverse and have
03:11 Come up short like if like if another neighboring universe
03:15 Intersects with the bubble of our universe we might be able to see signals of that and we haven't seen anything
03:22 That doesn't rule it out
03:25 Yet, but there's no conclusive evidence for it
03:28 Even if there were a multiverse we would never ever be able to access any of those other
03:35 Universes be able to visit them. They wouldn't be able to visit us for all intents and purposes. They wouldn't exist
03:42 so
03:45 when it comes to multiverse whether it exists or not, just just focus on our universe because really it's the only one we got
03:52 (Music)
03:54 (Applause)
03:56 (electronic music)