Sean is an extremely rare combination of a highly knowledgeable scientist in his field, and excellent at articulating it to laypeople. Very rare indeed and we are the beneficiaries. Thank Dr. Carroll!

This set is is a Ron Burgundy line “I have many leather-bound books and my apartment smells of rich mahogany.” also lots of clocks. So many clocks 🤣 Joking aside, Sean Carroll rocks👍🏼

This is one of the best summaries of the topic that I've seen

What I love about this clip is that every side of the topic is presented

Sean Carroll is such a great speaker.

Don't forget Asimov's 1st law of futurics: what has been happening will continue to happen. What has been happening? Constant revisions upward of the size of our universe and the numbers of stars and planets in it. The discovery of other universes would just be par for the course.

I wish the date this was recorded was included in the description.

Yeah, Sean Carroll... now I'm sorely tempted to subscribe.

Sean Carroll, Brian Greene, Max Tegmark, Michio Kaku….we are a blessed generation to hear these outstanding human beings of absolute factual knowledge….

Every generation since the dawn of time has said to each other “look at how much we know and how stupid people used to be!” Maybe we have managed to understand a handful of sand on the beach of human understanding. There is so much more.

Love your great courses + app I have. One of the best subscriptions I’ve ever spent money on. Thank you for doing it.

Incredible video by an incredible teacher. Subscribed today after PBS Space Time recommended Professor Carroll's series on Time. Definitely recommend

Love the content, and especially that set... just priceless. I was expecting Alfred Hitchcock to come out at some point...

This one was amazing...great explanation.

forget the multiverse, how many clocks does this guy have?

I've seen many of your videos, and, to the best of my knowledge, this is the first time I've heard you say unequivocally that the "multiverse" hypothesis is quite possibly not correct (as compared to should be, probably is, very well might be, etc.). That's good to see/hear!

I enjoyed this very much!

Sean is describing the planet of Krikkett, from one of the Hitchhikers books. At the start, it didn't go well for the rest of the galaxy when they found out that there was more than just their planet in the universe...

That set has a real Nick News with Linda Ellerbee vibe goin on back there.

1:20 "… parable…" - too late but well done! You just debunked the big bang gang. I'm with you.

How do you know which value for vacuum energy were "natural" ? Wouldn't you need to know a probability distribution ?

SCHRODINGER'S CAT certainly gets a workout in theory!

Seems like there is some time dilation going on with the clocks in the studio.

The multiverse example is right behind him ,the blinds on the window and it takes strings to move them

Sean, not sure if you read these comments but I would love to find out about interviewing you for our channel or podcasts.

I think that our priority should be surviving as a species and eventually we will understand the world around us and this is observable and measurable. The rodents we are descended from could only understand the world around it to a certain degree and as we evolved (survived) we began to understand the world around us. Over hundreds-of-millions of years evolution allowed our brains to develop and this happened without our consent or our conscious effort. I don't think we can find the answers we're looking for, a force greater than us will grow our understanding if only we can survive and this happened, we see it happened when we look into the past. Survival of the human species is the key to understanding the questions we have today. Write the questions down, record them in history, and spend most of your efforts making sure humans can live millions of years.

As a Christian, I’m often irked by scientists who parlay their specialized knowledge into an anti-Christian career(e.g. Dawkins, Krauss, Sagan, etc.). While Sean has wandered into the fray, I find him more genuine than the aforementioned. Concerning this topic, I found Lee Smolin’s book “The Trouble with Physics: The Rise of String Theory, The Fall of Science, and What Comes Next” very illuminating.

These lectures are great

One of the best Presentation. Amazing.

Love Sean Carroll - For me The Multiverse is just an excuse for the dead end reached by fine tuning. If we are really in a multiverse, wouldn't it be concluded that that the Multiverse be itself in a multiverse. I'm happy with one universe with God living outside.

THANK YOU... DR SEAN CARROLL...!!!

The thing is that if many realize that it's totally bogus than a lot of movies and series have to change scripts

Time Travel, actual Nuclear explosion, (refer to Oppenheimer's utterings, post the experimental Atom Bomb explosion in USA) Multiverse are mentioned in Hindu Sanskrit texts, written thousands of years ago. These are new to modern science.

tremendous upload The Great Courses Selects. I broke the thumbs up on your video. Continue to keep up the excellent work.

Very interesting and worthwhile video.

Earlier around 10 years back these were part of The Teaching Corporation Videos.

in my opinion, beyond super symmetry unification energies, energy itself becomes a dimension of the multi verse. If it interacts with any universe, then such high energy dimensions become hidden dimension of the interacting universes.

The multiverse is another way of describing the multi-nature of time and position. Heisenberg uncertainty principle makes sense because, Quantum mechanics is about multiple positions, multiple momentum, and multiple times future, present, and past. A photon does interact with itself in the double slit experiment, because it is interacting with it's self in different times. We know that time is not constant, and that an object has an average kinetic energy. Time slows down with increase in energy. This means some of the objects time is different within different areas of the object. It is spread out in position and time. It exists in a multiverse.

23:20 Wasn't the Higgs boson discovered in 2012?

Assuming another universe exists and has different law of physics, how this different law of physics affects if one of us visits the other universe (assuming we can visit another universe)?

Listening to life saying "we don't know what life is".

Are the great courses somehow related to the same great books ...as in the three books sitting under that clock on the desk behind him?

What is the difference between "Universe" and the "Cosmos"? According to the ancient Greeks?

The milky way was once thought the only galaxy in the Cosmo... Extreme observation get us closer to the truth of multiple universes...

What “triggers” a multiverse to exist? I believe only time travel can trigger multiverses. Something would have to have changed in the past (or future even?) to “trigger” or initiate an additional parallel universe(s). Because how can there just simply BE multiverses? What would “cause” there to be multiple “me’s” or “you’s”? So unless someone from the future has the ability to time travel, I don’t believe there are currently multiverses. Unless we can prove time travel 🤷‍♀️ And I believe the past doesn’t exist. Once we live into the next “now” (next moment), the previous now is gone. It’s done. No longer exists. Therefore, nothing to time travel back to. Therefore, no multiverses.

Sean Carroll is so awesome and the way he explains the Universe and life seems really easy for him* ..i think Sean Carroll is from an advanced planet and he came here to try and explain all of reality to us, :)

Every possibility is played out in the multiverses. Why can it not be played out in every galaxy. If there are 2 trillion out there, surely every possibility is accounted for. Why think beyond our own universe, when these possibilities could be happening in our own back yard?

OMG 😱 I finally found the perfect channel ! Than you

I joined Wondrium and love the content. But you have to sort out the UI. Search function is useless.

Probably a dumb question but that won’t stop me from asking .... doesn’t eternal inflation and the multiverse violate the second law of thermodynamics ?

Please define multiverse and universe. Can there be a diverse (or biverse), triverse etc? This all seems philosophical speculation to me

LOL... Is truly amazing how much we don't know. It is truly amazing how much we have to guess. And by the way gravity is also a theory. Look it up.

Simple to understod

Higgs hasn't been found yet? When was this recorded?

Free lunch??? It violates casualty & law of conservation of energy. Im sorry i couldn't take it. However your speech and style is always awesome.

Love this guy

The edge of our universe or the cosmic radiation barrier is like the event horizon off a black hole think of a bubble/balloon it's already popped once we can measure it not expanding anymore that's because it has already ripped the big crunch is on it's way

The atmosphere is not opaque, just relatively transluscent.

As explosions in space move out equally in all directions, it is logical to assume that the Big Bang behaved in exactly the same way. Ergo. there must be a mirror image of our Universe on the other side travelling in the opposite direction to our own. The big Bang cannot be the beginning, but more the centre ,so the Universe must be at least double the one we know.

Lovely movie. Super implementation. Congratulations on the idea. Greetings from Poland and invite you to visit our country

Anyone else reminded of "garden of forking paths"

I love this stuff..

The description on this video says it was uploaded 5 months ago,when the higgs boson was very much discovered. But in the video he says we have yet to discover it.🤥

Just how old is this?? Just posted in Feb but he just said the Higgs Boson hasn't been discovered yet!

I wish just once, one of these videos that talk about multiple universes would do one simple thing: Define specifically what the word "universe" means, just so I would know what they are talking about. The word "universe" has historically always meant, "Everything that exists". Well you can't have two or more sets of "everything that exists". The word "universe" never meant "everything we can see", as Carroll seems to imply in his introduction. It meant everything that exists, whether we can see it or not. The universe doesn't magically get bigger every time we develop a more powerful telescope. We just see more of the one that there is. So, can any viewer here explain this simply to me, a simple but precise definition of just what the word "universe" means in the context of "multiple universes"... a concept which seems meaningless and absurd by the historical definition?

I know that the multi-verse is totally true because I saw it on the Flash.

Who says that a counterfactual constant of nature COULD be different? If Sean Carroll was tall, disinterested in physics, and a basketballer... he could have been a basketballer!!! If i was handsome, an actor and George Clooney i could have been George Clooney! This is in no way science.

This looks very old, does anyone know when this was filmed?

5 clocks all different times 😆

If there is we will never know.

Sean Carroll you are my role model.. I love you ❤️

Interesting but very old video. It's apparent from the video itself and also because it's before the Higs Boson was discovered. 🙄🙂

M theory is not solvable using perturbation theory, and not well defined. Without knowing the geometry of the extra dimensions (of which there could be 10 to the 500 possible values) I just don't see how you can rectify this to be a viable theory. I don't like the first premise of we have no choice but to accept something outside of the universe may exist. Theists use the same argument for their deity. I know its not nearly the same comparison we have many mathematical proofs that support the hypothesis I just like getting away from any argument religulost people have. This is a really great video though attacking the problems head on in an honest direct way. Inflation theory is right its the best support for sure. Keep the vids coming!

Isn't this like the cave theory except for the upper class that is watching the cave interaction is just consciousness shielding itself from fear of the unknown

A brilliant way of saying "I don"t really know what's happening out there". Scientists speak as though they are the final word on what's what, the end all of things that exist. I love, admire and respect science, truthful, honest, humble science. They would tell you that a spoon coming into existence without an intelligent, purposeful maker is a scientific impossibility, an absolute absurdity. Yet in the same breath they want you to believe that our vast and mind bogglingly complex universe came into existence all by itself and without an all powerful and supremely intelligent Creator. "Billy go clean your room". "Don't worry Mom. My room will clean itself" The universe exhibits stupendous order. Where there is order there is evidence of intelligence. Where there is intelligence there is a brilliant mind. Where there is a mind there is a person. Where there is all of the above there is purpose. The Bible is clear. Our all powerful and supremely intelligent Creator whose name is Jehovah purposely produced this universe, everything we can and cannot see and put life on this Earth because his dominant personality trait is love.

11:40 But, if the universe is really infinite, then the amount of energy in "our" universe, is a dust mote in a sunbeam.... And I could just see a bouncing universe being created and instantly self-destructing, only to be reborn again in a fraction of a second and repeating. That would be interesting.

Let me explain what the multiverse is in a few sentences.... I see the universe in a unique “time-slice”. The distance between myself and any observable part of the universe is unique due to the uncertainty principle. The universe that I experience is in it’s own dimension of time, offset in time and space from any other observer. My personal unique moment in time and space makes me realize the universe as it exists “now” , any other observer experiences a slightly different “now” , due to the speed of causality. In short, there is only one universe ...what makes it a “ multiverse” is that all observers experience the universe at unique times and each have their own version of “now” and by logic...their own universes... that is what the mathematic is telling us.... One real universe experienced at different “time slices” by all observers..

His "foggy planet' is a decent description of Life inside the corona of a red star. It has been theorized that a clement environment may exist within the Coronas of red stars where planets would be shielded from radio communication with the rest of the universe and the rest of the universe would be optically invisible to the inhabitants of such planets. This idea is further explored and part of the Electric Universe Theory as well as being tangentially connected to something called, 'Saturn Theory'

Just stopped by for my daily mind blowing. I can wrap my mind around the multiverse, but what I CAN'T accept is the notion that there is infinite copies of me out there (one is more than enough). Even if there are infinite bubble universes out there I also think that there is an infinite amount of combinations of things (atoms, movements, timing, actions etc) that make up what is currently called "me".

Big brain

How about Multi Gods?

Yes, let's stick to observable things. I laughed out-loud. Is that why astrophysicists cling to dark matter and dark energy? Because they're able to observe rapid motion occurring to stars and galaxies but can't explain it? In 1919 Einstein proposed gravitational waves would result from the collision of bodies of great mass like neutron stars or black holes. Ripples would traverse throughout spacetime as a result. If infinite multiverses or parallel universe branched off of our reality it was proposed gravitational waves would be affected traveling through the missing or hidden mass. According to the theory the mass in the parallel or multiple universes would exert an effect upon the gravitational wave causing them to slow down the further they traveled. They proposed if gravitational waves lagged behind the speed of light it would be empirical evidence multiple or parallel universe overlapped our universe. If GWs lagged behind it would be evidence of multiple universe. If GWs travels at the speed of light without slowing down then it indicated there is no such thing as multiple or parallel universe. If gravitational waves traveled slower than light it would be solid evidence this universe was just one out of countless universes. If gravitational waves didn't travel at the speed of light it would explain why the attributes which make up this universe was finely tuned. It would explain why our universe has existed so long without winking out of existence moments after it began. It would debunk God. The multiple universes would each be random occurrences, set forth in motion after the big bang. Slow gravitational waves would be the holy grail for atheists and their evolutionary cosmology. So, what did LIGO measure? Every one of the GWs they measured traveled at the speed of light. Researchers went over radio telescope data and determined at the same time and locations of gravitational waves they found a spike in electromagnetic radiation, gamma rays or X-rays. There was no lag between the gravitational waves and electromagnetic waves. Indicating the gravitational waves were not affected by mass in hidden or parallel universes. Multiple universe appear to be science fiction at this point. It's back to the drawing board I guess.

finally teacher my teacher

If enough scientists look hard enough for something they can call evidence I bet they will find it and Mr average will believe it without understanding saying isnt science wonderfull it can explain everything.

1/infinity =0 1/ infinity =ZERO finite number/ infinity=0 This means you will never get a fine tuned universe by chance. The odds are ZERO!

I believe there is life outside the solar system.

Really stupid camerawork you need a better director but the talk is brilliant

....and after the sheep lived for ever happy! Sheep like multiverse because the grass never finishes! Theory over theory has make the sheep to forget how the truth may be!

4:00 Tell the big bangers the truth:- we evolved!

I've never understood why multiverses are depicted as round. And I still don't.

Why the need for the multiverse, isn't this universe not big enough

My friend you are great but stay away from “why” that you mentioned in your lecture and trust me don’t ask why did I say that. 🤨

Sounds like there are other attributes of reality that we have potential of exploring ( Example spiritual world, You quite literally Explained about half of it). Think bigger!!!!!!😤💪🤗 how would someone explore the stuff you're talking about. Listening to you talk is like the people in 1400's, Questioning the shape of the Earth Flat or other. If Christopher Columbus sailed the ocean will he fall off the planet? That's the best way I explain it.

In your intro you said that the multiverse was not observable therefore it was impossible to prove. You can say the same thing about evolution. We have never witnessed an evolutionary transition in the history of mankind. You may find a bone, or a dinosaur egg. But that doesn't mean anything.

An extravagant edifice built on theories which have no evidence in reality. I do not believe the multiverse is science. Furthermore, like the multiverse, the origin of the one universe we live in suffers from the same lack of evidence and a plethora of mutually exclusive ideas which all challenge the conservation of energy and matter. The idea of multiplying universes ad infinitum when we don't know the mechanism that the universe, we live in is particularly problematic. Physicists are fond of suggesting that the total forces of the universe, subtracting the negative from the positive is zero, purporting that the conservation of energy and matter are not violated. This is a red herring. All of the forces of nature should be added together violating the law of conservation.

Sean Carroll is great a explaining difficult subjects. But that tie is just too much. It's a serious fashion crime. An atrocity committed upon retinas everywhere. It's mesmerizing, like a slow motion train wreck. Perhaps a cry for help?

Prediction from another theory but not a theory.

Big Bang goes futt

I believe in a multiverse with multiple dimension... Only hope that beings with higher levels of intelligence will stop observing us and start helping us. We have to be one of the Lowest and worst dimensions with war and Violence. We definitely need help.

Patches make the garment worse.