00:00Imagine that somewhere, at hundreds of years later in our world, there is another version of you who watch this
00:07same video in this moment.
00:09This is not as crazy as that in an air.
00:12The theory of multivers has the wind in poop.
00:15The Marvel films to Spider-Man, passing by the recent Everything Everywhere All At Once.
00:21But it is not just a concept of science fiction.
00:25The physicists talk about this theory for decades.
00:27Let's see what they say.
00:29Do they exist in parallel worlds?
00:31If yes, we hope that we are in the reality in which you click on the subscribe button.
00:38Before we start with the Big Bang.
00:43Before the Big Bang, the universe with everything that we knew was concentrated in a very small point, super-chaud
00:50and mega-dense.
00:52Our universe was on the point of exploding.
00:54And then...
00:56Boom!
00:57The most colossal event that you could imagine is happening.
01:00In a moment, this minuscule point is dilated at an imaginable speed.
01:05It's the beginning of everything.
01:06The time, the space and all the galaxies around us.
01:10Then, like an extremely hot ball, the universe started to grow up in all directions.
01:15What seems logical, but what is curious, is that this time inflationist has been an incredibly long time.
01:22It's just the time of a moment.
01:24It's like if the universe had pressed on the button avance rapide, then had progressively ralenti.
01:30After this phase fulgurante, the universe continued to grow, but at a normal rhythm.
01:35This rapid expansion is called cosmology inflationist.
01:40It explains some great mysteries of our world.
01:43Why it is identical in all directions.
01:46Why the rayonement of the fond is uniformly divided.
01:50Why the galaxies are where they are, etc.
01:53The function of this cosmic inflation remains still a little mysterious.
01:58But scientists are interested in it.
02:00And the theory itself is universally accepted.
02:03But it has not always been like this.
02:05For scientists, this idea came to the beginning of science fiction the most delirant.
02:10However, it allowed to explain so many things that scientists didn't have other choice
02:15than to take into consideration.
02:16But all this was even more strange.
02:20According to this theory, the inflation could not be a phenomenon punctual.
02:24It could be that it could be repeated or repeated.
02:28Imagine the universe as a cycle without fin.
02:31Each explosion created its own universe.
02:34And the most important, it could be that these universe could not all be regis by the same rules.
02:40It could be that some of them are completely bizarre.
02:43With the laws of the physics totally false.
02:45Impossible to imagine.
02:46Which means that there could be a constellation of universes of universe.
02:51Unfortunately, we can't directly observe these other universes.
02:55They exist beyond the limits of our vision.
02:58That's where the theory of multivers comes into play.
03:01We've been talking for a long time of this idea of multiple universe.
03:05At least since the ancient Greece.
03:07In the years 1990, this theory has created a vif interest and began to appear in books and films.
03:15By the future, scientists have made more and more reference in their discussions and articles of reviews.
03:22Today, many scientists and philosophers are interested.
03:27The problem is that there is no proof or solid proof of these other universes.
03:33This is not a theory proven or confirmed.
03:36This is not even a theory at all.
03:38It's only a hypothesis.
03:39It's an ensemble of interesting reflections.
03:42Before taking conclusions, we need much more information.
03:46It is difficult to find proof of the existence of worlds parallel.
03:51We can't see anything beyond another.
03:54It's why many scientists think that the multivers probably doesn't exist.
03:58But everyone is not sure.
04:01If some physicists affirm that we can't observe the multivers and so confirm the reality,
04:07others suggest a different approach.
04:08Instead of trying to find these worlds parallel, we could try to examine our own and its history.
04:15Vers the years 2010,
04:17researchers examined the data collected by a instrument
04:19called Wilkinson Microwave Anisotropy Probe.
04:24They thought to have found signs suggesting that our universe
04:28could possibly have entered in collision with other universes.
04:31But then, other scientists used a more sophisticated satellite,
04:35more sophisticated,
04:37a higher resolution,
04:39to examine the data in a deeper way.
04:41And they found no proof of these collisions of the universe.
04:45In addition, nothing indicated that other universes
04:48were a gravitational gravitational on the other.
04:51However, a interesting discovery was made in 2015.
04:55A scientist studied the radiation radiation of the Big Bang.
04:59According to him, there was something super luminous,
05:034500 times more luminous than before.
05:05At least, according to the elements,
05:07protons and electrons,
05:09which, according to scientists,
05:10were present in the primitive universe.
05:13According to these Frank-Tierer,
05:15it could be the first proof of the collision of our universe with others.
05:20Suppose that this is true.
05:22The multivers would not be the result of human decisions
05:25that create alternate alternate lines.
05:27In quantum mechanics,
05:29these are not human decisions
05:31which divide all the world in parallel,
05:32but the measure of subatomic particles.
05:36So, if we examine this theory scientifically,
05:39the other worlds would be at billions of years
05:41and what happens would not have to do with our daily choices.
05:45So, what would they look like ?
05:48Well, Max Tegmark, for example,
05:51has described four levels of universe and multivers.
05:54The level 1 is the extension of our world.
05:57Our universe is an immense place,
05:59and in an infinite universe,
06:01there will be infinite pieces like ours,
06:04each with its own own history.
06:06The level 2 is an infinite universe
06:07of different pieces.
06:08But given their numbers,
06:10some could look like ours.
06:12However,
06:13they would be very far away.
06:15The level 2 is a universe
06:17with different different constants.
06:18According to this idea,
06:20our universe is part of a much larger space
06:22where they form a big bubble.
06:24Each bubble can have its own own rules,
06:27laws of the physics completely different.
06:29The level 3 is the interpretation
06:31of multiple worlds of the quantum mechanics.
06:34It's a difficult one.
06:35In the quantum mechanics,
06:37things can be strange.
06:39Imagine that you have a 3.
06:40Each result could create a distinct universe.
06:44So if you obtain a 3 in another universe,
06:47it would be a 6,
06:48and so on.
06:49Yes,
06:51it gives a bit of a vertigo.
06:52According to this idea,
06:54each result possible
06:55would create a completely new universe.
06:58Finally,
06:59we have the level 4.
07:00It's the most abstract of all.
07:03According to this model,
07:04every universe or reality possible
07:07could be described by using mathematics.
07:10If only I didn't have been in the course of algebra.
07:13Imagine all the mathematical equations
07:15that it would be necessary
07:16to describe all the imaginable forms
07:18that the universe could take.
07:20According to this model,
07:22each mathematical equation
07:23describing a universe
07:24exists really.
07:26And each of these universe
07:27is real in its way.
07:29Stephen Hawking was a part of
07:31the interpretation of multiple worlds.
07:33The level 3.
07:34It was one of his last theory
07:36before his death.
07:37He said that the universe is finished
07:39and quite simple
07:40that they tell us
07:41many theories about the Big Bang.
07:44According to Hawking,
07:45the universe is like a quantum quantum
07:47giant,
07:48a mer of possibilities
07:49and probabilities.
07:51In this perspective,
07:53each result of the history of the universe
07:55is played in a parallel existence.
07:57And we,
07:58as observers,
08:00play a crucial role.
08:01Our existence
08:02and what we observe,
08:03according to Hawking,
08:05make actively the universe
08:06that we see.
08:07In terms of simple,
08:08the universe is a shadow
08:10and we are all painters.
08:11If you look at the same
08:13great and crazy
08:14and crazy,
08:15remember that a lot of things
08:17have been considered
08:17as foes
08:18before we demonstrate
08:19the overwhelming
08:20veracity.
08:21So,
08:22is there a copy of you
08:23somewhere,
08:24in the same way,
08:25and who just clicked on the
08:27button
08:27j'aime?
08:28Who knows,
08:29if there are infinite copies
08:30of us,
08:31scientists suppose
08:32that we could be
08:33identical,
08:33together,
08:35together,
08:37different people
08:39and different.
08:40And if these worlds exist,
08:42maybe we can even see them
08:44one day.
08:45There could be
08:46links between us,
08:47something that would
08:48allow us to travel
08:49between the dimensions.
08:51For example,
08:52the tin of ver.
08:53What it is,
08:54we hope
08:55one day,
08:55we will know more.
08:57From here,
08:58stay curious.
08:58Stay.
08:59.
08:59,
08:59.
09:00,
09:00,
09:00You
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