The cheapest way of time travel is taking a nap, you close your eyes and leap into the future.

Lee Smolin was by far my favorite interviewed expert in this episode... thank you.

Lawrence you are in my head. All of your videos have plagued me all of my 45 yrs. Thank you for sharing your journey with us like minded people. But it is all consciousness, there is no thing else.

Best channel on you tube 🙏🙏

This podcast is truly outstanding. I so appreciate professor Kuhn's intelligent explorations of the thinking of the best minds.

We need to understand what time isn't, so we can narrow down what time could be!

I'm not a mathematician, so that language is beyond my scope, but having listened to many physicists explain time and space in their own terms, Lee Smolin makes the most sense to me. He doesn't have a final answer, but his explanations comport with my own uneducated view of space and time. It's comforting to know that there's someone out there in the field who is respected and who has come to see that my view of the world is quite possible from a scientific perspective. If you'd been laughed at as many times as I have by physicists or had gotten those glaring stares as much as I have, that means something.

Its Such s treat being able to listen to these conversations.

One of my favourite channel on KZfaq!

The way the audio repeated at 8:46 as they were talking about how crazy time was...had me thinking I entered a time loop

There is no real time outside without human awareness.

BTW - Kip Thorne’s articulation of relativity was masterful in its simplicity and clarity.

Knowledge and understanding is the most precious gift. Mr. Khun’s contribution in bringing us all Closer To Truth is invaluable; respect, kudos and sincere appreciation to him as we continue to follow him on our journey of discovery. This respect comes all the way from Hong Kong 🙏🏼.

I think time being emergent is a very simple and coherent theory, and it ties well with the simplest theory of personal identity. We feel as if time exists, and that is because we remember our past but not our future, and we can differentiate between 1 second ago and 5 seconds ago, that is just the way our brains evolved. There is a certain order in which our mental states occur, from past to future. There is no reason for this order, or for time to be fundamental. It is a useless ontological commitment. We experience things in a certain order, which alligns with classical laws of physics for a simple reason that those classical laws were developed by information processing system which works in time. So you measure ball's velocity at t=1, then t=2, then t=3 and so on. You don't measure it at t=3 and then at t=1 and then at t=2 and then try to develop a set of equations that would support such evolution in such time, it is not evolutionary benefitial at all for us to have such method as even somehow intuitive. Imagine knowing just all the states of the ball without knowing the time, you can try developing laws of physics for each possible ball-state combination, and you will likely find that the simplest ruleset is the one that describes the evolution of ball-states in the same time we experience. This is because our brain is an object, just like the ball, and all the information processing in it is more likely to occur by the simplest ruleset which is the one that matches with the order in which we experience things. Here is my argument: I can imagine such a bundle of ball-states that the simplest ruleset explains a certain succession of those given ball-states does not match with the simplest ruleset that explains the succession of states of the information processing system that is studying the ball's movement. Time is the order in which information is processed. There is nothing fundamental about that order. It just happens to allign well with everything else happening in the physical world, for reasons described above. It could be that it does not allign, although I am sure it is mathematically very unlikely. So the picture that follows from this: there is a bundle of mental states. Those are experienced in a certain succession, each of them feels like it occured after the previous one. This succession is emergent. I actually have a very simple argument for that order being emergent. Let's suppose it's fundamental. If order is fundamental, t1 t2 t3 is different from t3 t2 t1. Let's say t1 is experiencing rock flying into the window, t2 - rock breaking the window, t3 - aftermath. t3 feels like continuation of t2 and t1, because it contains memory about those. If you reorder the mental states so that t3 is the first, t3 still contains the memory of t2 and t1, it still feels continuous with t2 and t1. And t1 does not become such that it contains the feeling of being continuous with t3. Reordering the mental states did nothing, as the contents of those mental states didn't change. The subject of the subjective experience realized in those mental states will experience the same thing regardless of the "order" of his mental states. Given that, there is no reason for an ontological commitment to the existence of any specific order as it does not make any difference.

One of the best episodes. Congrats Robert! I would have asked the very same question about the existence of the future in block universe... 😊

All it takes is one curious human being.Dear author thank you for genuinely being curious and putting out all the knowledge to the world.

"what do you feel?".... You can see the real enthusiasm and struggle on Robert.

love this show for along time BTW. im pausing it and going over it again and looking up definitions.

Thanks for these videos. I'm not a Scientist. I'm just a regular person with many questions and a thirst for answers. Your quest to find answers to my difficult questions is commendable.

I really wish Robert Lawrence Kuhn would interview me on these topics. I have ALL the answers!

It takes time to get closer to truth

One of my best episode, thanks !

I have the feeling that I am always "here" and always "there". I could take you to the exact location of my 5th Birthday and I think I am still there in time in the everlasting "now". All time exists in an eternal now.

Pleasure overload.

Loving this channel.

I'm not sure if this show is taking me closer to truth or closer to head explosion but i love every episode. Thanks!

Very beautiful videos thanks .... worth millions and millions of love

Fantastic as usual

The way some of these guys, like that Nima dude, will just rattle of facts and figures related to concepts and principles like Plank length in a "of course everybody knows that," sort of manner always blows my mind. It's not done in a I'm the smartest guy in the room kind of way, it's just how they roll. His stream of consciousness is vastly different from mine that's for sure.

kuhn's face when the guy says 'two axis of tome', so good. same here :-)

Physics and philosophy seems so the same at that level. They can say whatever they want and everybody will listen in awe.

Thank you! I can sense my conceptual horizon expanding as I watch your videos. (The word gravity leapt to my mind a few minutes before one of your interviewees brought it up.)

What Robert is doing is truly amazing. Seeking the truth in the mix of solid science and biased beliefs. There is no consensus on time no matter how successful are theories backed by empirical evidence. And to put ot simply thete is no time only abstract clocks conveniently located wherever we need them. But scientist don't like the mystery to disappear so they keep supporting mythologies.

when i was very young maybe 6 years old and i was told to wait 5 minutes or 10 minutes for something i would look at the clock and man it really felt like forever. and people would say thats because your young time will go faster as you get older implying that its a figment of the imagination. But as i am learning these things i realize now that it was not a figment of my imagination time really was going so slow for me and that it most likely has something to do with my size that i was was much smaller in relation to the earth then adults. and then it all made sense. on a side note its nice to know we have all lived a life time no matter how fast we die. and imagine how long time is for a microscopic organism. when i was real young it felt like the time would never come that i die but we know that it will come. so all that matters is what lays ahead and what is out there in space and beyond our dimensions even. when you think about why anything at all rather then nothing at least for me i am understanding that its because it had to be and most likely everything had to be and there is no such thing as nothing.. in fact that is the meaning of nothing, that it don't exist. so don't worry you are here and will always be here.

Beautiful!

I just love kip Thorne. Genius mind

I really enjoyed this one.

It's common misunderstanding that it is possible to go back and forth in space. Matter defines spacetime and when you are moving forward then the space behind you is not the same space - there the defining matter has been changed - you can never go back to the past position but when you imagine you turned back, you only turned the direction where was the next forward direction. Space and time are really equal.

I don't have the words to express how I love that show. I need more of that great thinking presented here. Thanks, happy Christmas to all of you.

It is real that time is a concept of the rate of motion intrinsically from each heart and mind.

Space creates time!

Pure mental bliss

That's such an interesting and damn good question

Every one feels time no one knows time.

I think time is as real as temperature is. Nobody talks about if temperature is "real".

Time is natures way of preventing everything from happening at once.

Time--The absolute unit

Great episode.

Beautiful work as always 👏 Boy, I wish we knew the truth about time, it's the topic that intrigues me the most

That was such an intense episode but so good 👍

Great episode. All that in 26:46!

Really good!

All I can say, it's about TIME ~ !

Phenomenal

what lee smolin said was very interesting

I would postulate that time is emergent from space and that no space is impossible (a vacuum is still a space with feilds.). Our brightest minds are experts at rationalising, analysing and justifying any point in or about our Universe.

I sometimes look at books that I have read, or even stacks of books, and think, "All of that is in my head."

4:18 Strong parallels with children or grandchildren. As a parent, you are constantly sending information backwards in time in a sense to avert disasters but never being able to realize that world for yourself. You try to give them hints and advice earlier in their youth than you understood that information in yours. Their reality is a split dimension of what yours could have been.

Got lost in there but since my brain organises my life around space, time and cups of tea, I managed to find a way out of the maze and survive and i feel ok again...😉🤔🤕

Time is a loop, Perfectly spiraling out and back in to itself.

Two axes of Time... that's my mind blown for a week or two!

Since the space and time are relatives and everything exists in spacetime can be reduced to information that is perceivable only by consciousness thus fundamental quantities must be consciousness and information("knowledge").

I like the way the first guy describes time, he's getting closer to the truth. A time traveller would be able to master skills at seemingly superhuman speeds wouldn't they. because they could simply spend hours practicing and then return to the point in time where they started learning and look like a genius. If someone could manipulate time that would make them invincible next to those that couldn't. They would know things they shouldn't know. They could have entered a room heard a conversation, then gone back in time and never entered that room and still known what was said leaving the occupants wondering are they guessing? they couldn't possibly know that could they? Think about it, I wouldn't mess with a time traveller, neither should you.

Time is contingent on individual perception. Blows your mind to try and conceive it.

Thanks

Nothing but the intervals to which we attach names: hour, minute, second. Einstein demonstrated in 1905 that time does not exist, its only valid expression is as a variable.

It can be *both* absolute and relative, *both* flowing and all there. Just treat the two versions as different dimensions and coordinates, treat *all four dimensions* of space-time as itself flowing in time. The coordinates of space-time being (x,y,z,t), and of absolute time s. In Minkowski geometry, the proper time fits that bill. The line element for the Minkowski metric, written as a proper time metric is: ds² = dt² - (1/c)² (dx² + dy² + dz²). Throw in s as a coordinate and write the line element, instead, as dx² + dy² + dz² + c²(ds² - dt²) = 0. That's the light cone of a 4+1 dimensional metric (a de Sitter metric). The t-time is "all there", the (x,y,z,t) all "flow" in the s-time. There you go. Problem solved. You're welcome. Oh wait. There's more. The "time dilation" (s - t) has a *non-relativistic* limit too! More precisely, the coordinate u = c²(s - t) continues to be perfectly meaningful, even in the limit c → ∞. Substitute it in the line element, before taking the limit, and you have (1) a quadratic line element dx² + dy² + dz² + 2 dt du + (1/c)² du² = 0, and (2) a linear line element for absolute time ds = dt + (1/c)² du. That geometry, or a derivative of it, is used in 5D cosmology; *specifically* to bring forth an "historical time" dimension (s) alongside coordinate time (t). Take the non-relativistic limit and you have (3) the line element dx² + dy² + dz² + 2 dt du = 0 and (4) the absolute time ds = dt ... which shows how and why the "absolute time" = "coordinate time" conflation originally comes about: it's a holdover from Newtonian Physics. This geometry is called the Bargmann geometry. The symmetry transforms that leave its invariants, (3) and (4) fixed is called the Bargmann Group - which is today recognized as the *correct* symmetry group for non-relativistic theory, rather than the Galilei Group. The Correspondence Principle states that a new paradigm should grandfather in (and provide Relativistic corrections for) *all* of the old paradigm. The newer understanding of the old paradigm (Galilei being lifted to Bargmann) means that the other end of the Correspondence Principle *also* has to be lifted: the symmetry group of Relativity (which is Poincaré) has to *also* be lifted - along with its geometry - to one for the invariants (1) and (2), rather than for Minkowski geometry. So, not only is this a way to incorporate historical time, s, alongside coordinate time, t; it is *mandated* by the Correspondence Principle, applied in reverse, to accommodate, reflect and match the newer increment in our understanding of non-relativistic theory. The old paradigm informs corrections for and increments on the new.

Intresting topic just the other day I said time can be manipulated I hear you !

Real about time is both the potential time + the realized time.

Could there be causation at the planck space / length, which also produces the future beneath the planck time? What might causation look like physically?

What about time in multiple universes (classical)? Can there be causation from one classical universe to the next?

I believe time fits better as an emergent dimension, not a fundamental one

Could be that time is actively shaping physical reality. When perceive time, perceive different effects on physical reality that time is shaping.

I am a simply a devotee of your curiosity and lucidity.

Makes my mind wander and even believe i can solve time travel 🧳🧭 😂😂 love it

So time is conciousness

13:38 his analogy using the book to explain block universe was fantastic.. I believe similar, except I think there are an almost infinite number of remainders to the story, each potential until the page is read. Think of a book that gives you the opportunity to have free will, and to an extent, choose how the story unfolds.

Is e=mc^2 exact, or is it an approximation, like the fine structure constant?

Does causation trade off between space and time, making them relative to the observation of causation?

I wonder if we as humans even have the perceptual and intellectual access to reach the true answers. We might be limited by perception in a way we cannot even conceive of, so reaching a full understanding of the nature of reality may just be like trying to cut your way to the end of a mobius strip try to get 2 pieces.

I'd love some new episodes if that were possible once this pandemic is over come on Robert you can do it

When you interviewed Kip Thorne, you should have asked him about his fine collection of vintage CRTs.

There is no time...only now....our identity is a constant always present in the now...so its a I AM...think about a "past"event and you relive it as though you are experiencing it...same with "future"...I want this type car is only because youve experienced the feeling of owning it as NOW..thats how we get goals...in.my practice I helped most people to stop reliving past experiences..im a clinical.psychologist....ive not had a watch or clock for over 30 years and ive never been late...stop thinking time and your internal watcher keeps you always "on time"....we only move through events..seasons...but ALWAYS as me now...the eternal I AM

I think time is just a collection of single moments. Nowadays I can continuously take fast snapshots with my phone as I'm moving. If i were to take all of those images into my movie editing software and make each frame as short as possible, i could almost create the illusion that it's a video and not a collection of images. Maybe the Universe is expanding into time itself, rather than both time & space on the run into an endless void. That would mean, what happens in 10 years from now is already predetermined, it will happen, because space will catch up to that moment of time. The smallest measurement of time is Planck length, but that's only because we can physically measure it. Any measurement of time within space is possible, without space, it's immeasurable. Impossible isn't the word, you can't exactly measure infinity.

Is photon speed of light communicating information of past causation?

Listening to the different views of the last two physicists - from my lay perspective - seemed like the Pre-Socratic philosophers Parmenides and Heraclitus all over again.

How do we know if time flows/moves?

Time is measured causality.

I feel same Sir🇮🇳 time is illusion Sir🇮🇳

Wow Lee Smolin just dropping a truth bomb over there

Events may come and go, they may emerge , be simple or complex, be reducible to something fundamental.time cannot.

For the two observers that see time on the clocks slow down for the other observer, does time slow down the same amount for both observers, or what would determine the difference in the slowing down of the clocks?

Time distance (Pinitial -Pfinal)/√5 And the v speed Through ui formula With only one single parameters in two spaces

I think it's possible that the flow of time as we experience it is part of our conscious model but that, in a sense, all moments and maybe even all possibilities exist at once. Perhaps there is a relatively simple mathematical system or algorithm that contains within it the information needed to describe all moments and all possibilities and our brains make sense of that with experiences and linear time and timelines. Any experiment performed is filtered through time based on our conscious experience of it, whereas maybe every moment of the experiment and everything else in time really exists at once as part of that infinite description of every possibility and outcome and we are in a sense 'sprawled out within that description'. A simple equation may be at the heart of everything.

Dear Bob, Yeah if you are moving at relativistic speed so spacetime can flex, Kip, et. al.. In practice these thing should be imperceptible at every day speeds, right? Why don’t I adjust the massive energy of space so I can move relativistically to the stars? Why don’t I adjust time so I would do that? Just wondering 🤨

In our time we are using gravity principle to quantity time using time quantity through light is more precise and useful

Closing was closer to truth

Couple of questions: (1) how is believing in the Block Universe concept different from believing in destiny/fate? (2) The Harvard scientist talks about gravity as though it is independent or separate from Spacetime. But I was under the impressions that gravity _is_ spacetime; didn't Einstein say that gravity is simply the physical manifestation of spacetime! curvature? (3) how can we think of gravity and quantum mechanics at the same time? (I know.. that's the unification that great minds have been/are after). My question is, to talk about any meaningful existence of gravity, don't we we need massive or at least a substantial or significant amount of mass, which quantum mechanical entities just do not offer?

Time is just the freedom to move

"All the phenomenal world or universe is simply a Mental Creation of THE ALL, subject to the Laws of Created Things, and that the universe, as a whole, and in its parts and units, has its existence in the Mind of THE ALL, in which Mind we live and move and have our being." -The Kybalion