Seth Lloyd - Is Time Travel Possible?
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- Опубликовано: 9 июн 2024
- Some scientists take time travel seriously. Should you? What does time travel reveal about the nature of space and time? What about the laws of physics under extreme conditions?
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It always seems like we are asking about our physical bodies time traveling....
And we assume that you remain "intact" when you time travel....
One of the few science lecturers that makes learning fun by throwing in a lot of humour and mentioning many brilliant different aspects.
I believe sound can be heard before it is played. Late one night (one of those deathly quiet ones) I became aware of a sound effect much like an 80s video game. It was extremely feint and kept repeating in a 5 second loop. Never heard it before. The next evening a film was on our TV in which the very same sound occurred - it was a kid playing a video game in the background of the film. How can I possibly hear that 24hrs before it was played? The sound was definately in my room and the only thing that was on was the room light. I will never forget it.
Neighbour's with satellite TV on? :D
If we describe time in terms of information, it would be the rate of change. If we describe space in terms of information, it would be these regions where the relationship of a difference between two or more things live. In a network the dimensions are not discrete and there is no way to determine the number of dimensions involved in complex systems.
I never saw an interview in front of hot water heaters before. lol But still very fascinating... thank you for uploading!
+John Morris Do me a favor, watch George Carlin's bit on "hot water heaters". :D Hilarious stuff.
Just in case that is not a satirical or rhetorical, The Avance Unit behind Seth is an NMR spectrometer equipped with a special tritium probe which allows measurement of 3H NMR spectra in tritium-labelled compounds. The big round tank behind the Host is a compressed gas tank. Most likely Carbon dioxide but too out of focus to be sure.
Seth Lloyd seems like a descent and cool person
Seems to me that time is precisely and only
a very convenient, very useful concept for
thinking about vast amounts of things moving relative to other things.
Now I think about it,
those "vast amounts of things" includes every thing.
Now all the physicist have to discover is why things move differently under different circumstances.
For instance, why clock movements move less when they are in orbit.
It's not 'time' that changes up there (for location has no effect on a concept),
it's just the amount of movement of the parts increases.
Perhaps gravitational fields simply affect movement.
is time travel to past future really possible and how please tell can u help me out to do
Are people working on measuring and analyzing (hopefully one day decoding) Hawking radiation, if it's practically detectable at all?
How about a continuously unfolding present moment always being now? Time dilation is simply the slowing down of the unfolding of the present moment. But it's still always Now for you. Even if you go near the speed of light and things slow down for you.
He left out that the Universe is expanding...so going back in time the whole Universe has to be rewound. Unless the Universe is a hologram and everything past and everything to be is recorded already. Then time travel is just crossing a few atoms of thickness.
The older I get, the more I think that even if time travel is (will be? was?) possible, we would never know. If anyone changed something in the past, the subsequent universe would go off on a different course and even if one could somehow interview someone in that other reality, they would have no awareness that anything had "changed" - since history would be a sort of "self-sealing" sequence of events.
He didn't say the most important thing about that. All of this ideas share common feature - thay can't be used to send any real information. It works for quantum state, but when you trying to measure it - you always have completely random thing. And you can't avoid it somehow, cause it will make quantum mechanics inconsistent. So really, the answer is - No, you can't :(
2nd law of thermodynamics, conservation of matter and energy. by going back in time you are creating matter as the atoms were there before you arrived
IDK if that's a problem or not. You'd be adding to it from outside, which you can do with engines and so on. The rules treat the matter in closed systems, but they don't prohibit larger systems. That seems maybe possible.
You'd be bringing atoms back in time... Your atoms in the future are old atoms that have existed for eons. The exact same atoms would exist twice at the same time. I don't know why that would be a physical problem but it's weird.
Maybe not creating matter but rearranging it along with energy. As long as there is no net change, nothing would be created or destroyed. As in, maybe traveling back in time would require the exact amount of energy subtracted from the destination to which a person is going. But, yes, if that is not the case, then (maybe you meant to write "the atoms were *not* there before you arrived"), then that would be a problem.
Complex information coding the structure of an entity is lost in the Hawking radiation.
On relativistic ct-x diagrams you need to go faster than light to go back in time and that is from a pure mathematical perspective even. Nothing goes faster than light, so it must be impossible I guess.
Unless we find negative energy in the cosmos or some other element or force.
I have done time Travel in future , Really I have many experiences of Time Travel in future, it's not a hypothetical... If you interested in me then I will be share my experience and secret of time travel...
When going back in time you arrive in a time when entropy in the universe was in a different state. How's that?
well I wouldn't mind
@@IABITVpresents How old are you?
@@GeoCoppens 20.
I miss being 19, I hate having an existential crisis at the age 20.
Dr. Ron Mallet.
intelligence can travel in time...not the body....intelligence is all we are, the body is just a vessel for this intelligence.....thats the answer period the end. and they know this
interesting. I remember a guy who called himself John Titor kind of explaining how micro-singularities made time travel possible some 15 years before this guy... AND, he said CERN would be the one to discover it! He said the Many Worlds Theory was correct... coincidence?
Lloyd is engaging in verbal sleight of hand when he asserts that we are "traveling forward in time". One could just as easily say that the future is moving towards the present. Or one could say that "the future" doesn't exist at all, and that only the present does. The mistake he makes is to interpret the words "traveling forward in time" literally when in fact this sentence is nothing more than a metaphorical description.
Seems to me that time is precisely and only
a very convenient, very useful concept for
thinking about vast amounts of things moving relative to other things.
Now I think about it,
those "vast amounts of things" includes every thing.
Now all the physicist have to discover is why things move differently under different circumstances.
For instance, why clock movements move less when they are in orbit.
It's not 'time' that changes up there (for location has no effect on a concept),
it's just the amount of movement of the parts increases.
Perhaps gravitational fields simply affect movement.
Also consider this:
If a person went back in time, they would not have gone back into an exact replica of the time they thought they were going back to. That time did not include them being there. To truly "go back in time" it would seem one would have to hit the rewind button on all of the universe itself. Otherwise, one would still be going forward in time, but this time the past includes them being there as a backwards time traveler. A "new" forward timeline would have been created at that "new" beginning, without erasing the past forward time line that already occurred. Get it?
No
+David Heller Don't consider it, I don't care if you do or don't.
Time paradox is in science fiction. If we can go back in time we cant alter the time line we would be ghosts and the events have already played out according to science now maybe if we could hack the computer simulation maybe. The simulation is not flawless has bugs.
+David Heller Modern science says that time varies, so who really knows? Maybe we could go back in time because time itself varied.
There was a science video about that with the scientist that explained gravitational waves on the Colbert show.
If you go back in time and shoot your grandfather dead, and come back, you come back to a world where there becomes a reason why
your grandfather is not your (biological ) grandfather. Like, before you go, your father or mother, never told you that they themselves were adopted children,
and yet, after you "murdered" your grandfather, and come back, your mother "suddenly" tells you new information she was the adopted daughter
of your "grandfather"....
As far as time differences between a stationary clock and a moving clock, what about all the energy interactions occurring affecting those two clocks?
Gravity fields vary, magnetic fields vary, neutrino impacts vary, etc. They most probably would, (and apparently do), vary. Oh what a surprise.
+Charles Brightman "Time = the speed of causality."
+Sith Smasher That is what many people believe. The problem with that definition though is that it uses "speed" (distance divided by "time") in it's definition. They are using "time" to define "time" without saying what "time" itself really is.
Myself personally:
"Space" is pure energy itself. Wherever space is, energy is. Wherever energy is, space is.
"Time" is the flow of that energy. If no energy flowed in the entire universe, wouldn't we say that "time stood still"?
But, even if that definition were utilized, the "speed of causality" was probably very high during the "bang", is less now, and will most likely be even less than it is now in the future. "Time" itself would be slowing down but we don't notice it because we are inside the universe. As modern science says that energy cannot be created nor destroyed, (hence eternally existent unless modern science is wrong and energy was created at least one time in it's history), and also that the universe is expanding and even speeding up as it expands, the energy in the universe would continue to get less and less dense most probably on it's way to a "big freeze". Unless there is a way out of this universe, all life not dead by then, will die then, possibly frozen in "time" for literally forever.
Modern science recognizes a one to one relationship between space and time. But if "time" varies, then maybe it's not a one to one relationship and while the universe may be truly expanding, time itself might be slowing down faster and faster and hence we perceive a universe expanding faster and faster, (which currently makes no logical physical sense by the way. It would make more sense that our solar system were being pulled into our galactic center's black hole faster and faster, of which could be proved or disproved by looking for a "blue shift" of energy between the Earth and our galactic center along our spiral arm of the galaxy. Or maybe both are true, universe expanding and we are being pulled into the galactic center faster and faster.).
In addition, if "time" varies as modern science says it does, then all the physics formulas that depend upon "time" in their calculations would have errors in them. Even Einstein's "speed" of light ("speed" being distance divided by "time"), would have errors in it due to as "time" varied, "speed" would vary, which would also then cause "E" energy in the formula to vary. If the "speed" of light varies, then it's not a constant.
But it appears it all doesn't matter anyway from the human perspective as far as eternity is concerned because all of our life currently appears to be an illusion from our human perspective as far as eternity is concerned. Yes, life matters while we exist. Yes, even our death might matter to others. Yes, we might be remembered for a time after we die. But the current analysis would indicate that our consciousness (whatever it actually is as even modern science doesn't even know yet, nor even how the brain even thinks a thought, two things so vital to how we even perceive reality with), appears to be attached to our physical brain. When our brain dies, we die, for eternity. We will forget everything we ever knew and experienced. The sum total of our existence is only what we leave behind including how our existence affected the larger society. (The largest society of all being the oneness of all things in existence). The thing is though, that modern science says that the Sun is supposed to become a red giant one day (a very long time from now), as it switches from burning hydrogen to burning helium and will most likely destroy all life still left on this planet Earth. (Why a very pro-active space program is so vital to have, plus with inflation it's not getting any cheaper to do, plus the sooner it's done more entities from this planet Earth could be saved. And we might not only have to get off of this Earth and out of this solar system, but possibly out of the galaxy as well one day. And what about all the entities "left behind"? We all can't certainly physically go.).
But even if some did in fact make it, the universe is most probably going to end in a "big freeze" anyway. Plus, modern science says that the forces of nature all came into existence in the early moments of the "big bang". With an expanding universe and energy getting less and less dense, probably when, not if, the forces of nature "evolve", what then? Current forces of nature going to change? Any new forces of nature going to come about? Any current forces of nature going to go extinct? And possibly all occurring in the very next moment of time?
BPC: Blink, Poof, Change: and in the blink of an eye everything in the universe changes but yet we retain our consciousness somehow, someway?;
or, and more probably:
BPG: Blink, Poof, Gone: and in the blink of an eye everything in the universe changes and we are all gone for eternity?
There has to be at least one truly eternally consciously existent entity that truly exists for anything at all to even potentially matter into an actual eternity. And then it would still have to matter to that entity throughout it's actual eternal conscious existence. Now, maybe possible, but not probable, eternity is a really, really long time. Our true destiny currently appears to be that we will all cease to consciously exist and then one day be forgotten as if we never ever existed at all in the first place. Hence, life is just an illusion from the human perspective as far as eternity is concerned.
Whether "time" is the "speed of causality" or whether "time" is the flow of energy, it appears it does not currently end well for us. Knowledge is not always "good" knowledge that is beneficial to us, but it is still knowledge.
And as always, as I as well as all of humanity truly do not know what we do not know, I certainly could be wrong. Maybe we truly do have an actual eternal conscious existence somehow, someway, somewhere, in some state of existence, that will last throughout an actual future eternity, but currently it appears that we don't. Our "speed of causality" will end for us.
"Whether time is the speed of causality or whether time is the flow of energy,..."
In my opinion, both definitions are valid. The speed of causality is a valid term if you would observe the universe from outside it. The flow of energy is also a good definition as without that the pattern of the universe doesn't change and everything inside can't experience 'time'.
It is known that two black holes or neutron stars orbiting each other lose orbital energy to gravitational waves. Planetary bodies do the same. Extending that fact logically then indeed I would agree with you that eventually all mass orbiting the central massive black hole of the galaxy will be sucked in sooner or later. This will be a process of many billions of years and the stars will be long dead by then.
The big freeze will end with only black holes, which will then slowly evaporate through means of Hawking radiation. Eventually all that will be left are massless particles. At least I think so.
And the big question. Again I agree with you that our consciousness is confined to our brain. When that dies and rots, our consciousness is destroyed and all that we were and knew ceases to exist. Most people can't grasp the reality that the universe exists for no purpose or that our lives have no meaning. That's why religion was invented. And an entity that survives for eternity; that is a really big unknown and will always remain so for humanity as long as we exist. If one or more do exist then they must be extra-dimensional. Nothing can survive in this universe's reality in the long run.
+Sith Smasher I had condensed space and time down into a single diagram and analyzed it. It would at least suggest that it is most probable that we all came from a conscious somethingness. This somethingness is most probably everywhere and in everything for it to even exist. One of the two things I have currently identified that this entity could probably never ever do is to personally experience a total cessation of conscious existence. And yet, that is the one very thing we as humans, as well as many other species, cannot apparently ever escape. Coincidence? Maybe, maybe not. It's possible that we die because "God" can't. It's the only way how "God" could experience "conscious death" is by how it is apparently being done. Create conscious entities out of self, that consciously exist and then personally experience a total cessation of conscious existence. If true, then at least one, (and possibly the only real), purpose of our existence is to cease to consciously exist. Should be really easy to do since it's the one very thing we cannot apparently escape. And would you expect it to be any other way with "God"? Who also by the way most probably set up this system of evolution to automatically have new experiences, including new evolutionary ways to die. "God" is also the only real reason I came come up with as to why the forces of nature haven't "evolved" by now. This universe should of been wiped out long ago and yet it's still here after supposedly billions of years of expansion whereby energy that could not be created nor destroyed is getting less and less dense. Even with "God" the forces of nature could change, but without "God" then entire universe and all in it, including us and/or any species alive at that time, could all vanish in the blink of an eye. Maybe even in the very next moment of time. Talk about living on the edge of existence, what a thrill!
Modern science says that energy cannot be created nor destroyed, hence energy must be eternally existent otherwise modern science is wrong and energy was created at least one time in it's history.
Modern science also says that we have new cells that come into existence on a daily basis inside our body.
So, a part of me is eternally existent and a part of me is being born anew on a daily basis. My body extends from eternity past until now. I currently am an eternally consciously existent being with choices. (Basically at "God's" basic level). Rising to even a higher level, one could see that my existence is existing in the "now" which is eternal. (And this applies to you too). It currently appears it will not always be this way though. One day I will apparently die from something and cease to consciously exist into future eternity. I will forget everything I ever knew and experienced and eventually will be forgotten, even by "God" into "God's" eternity, eternity being a really, really long time.
There is a poem I wrote:
"The Suckiness of Life"
Life sucks and then we die and/or life does not suck and then we still die. Then we either have a life after this life, which will probably suck and/or not suck, or we won't, and all suckiness for us will end for eternity. But, while we exist, if life sucks, try to make it better and then it might not suck so bad.
Try to enjoy life in socially acceptable ways, to try to stay out of trouble with society, but then no matter what, we all die one day from something and forget everything we ever knew and experienced, or so it currently appears. Then one day, we will all be forgotten as if we never existed at all in the first place, or so it currently appears. Hence, life is just an illusion from the human perspective as far as eternity is concerned. And, our true destiny currently appears to be to cease to consciously exist and then be forgotten.
Cheers mate, enjoy life. Hope life doesn't suck for you.
Charles Brightman
Well I also thought about this question: has the universe eternally existed or was it created. There is no need for a religious god that has existed forever since the universe itself might have done that. Something you can't seem to make those plagued with religious dogmas understand. Maybe you have heard of these wild theories that say we live inside a black hole, or that the Big Bang came to be with matter sucked into a black hole from another universe. I think it's far fetched, but I am always open to any reasonable idea.
The idea of a 'self-conscious' universe isn't new. In fact I saw something mentioned like that in the scifi series Babylon 5. The Minbari character Delenn believed in such an idea.
As for my life, well yes it does suck, at least part of it does. But I am coming more to peace with myself. It's pointless to feel miserable when there's nothing you can do about it.
time is real. i know becuase i have experience a version of the predestination paradox. i had an experience of standing in my apartment in one place and suddently i feel the presence of a shadow. as i look at the shadow what i feel is familar with me as if i know him. after two days the same thing happend again but this time i feel as if the shadow is me as in that moment i remembered where i was in the room two days before and that was exactly the same spot i was standing in as the spot the shadow i saw two days before. this time i felt like the shadow was me and that i could make out the outline of the jacket i was wearing two days before but in the location i remember i was two days before. after that, i was certain that i had met myself two days appart but in the exact same room and that the times it happend must have been where the location of present and future earth must have overlapped. after this event, i was no longer sure if time on earth had anything to with time in the universe and that maybe time was somthing local as if it was only on earth and that time on other planets was like seperate dimentional spaces of time having their own independent history of time unlike our own. when i felt the present of me in the two days appart, i also felt the future me was a stranger in some sense. what seem to have happend was, that somthing between the past and present had entangled as if they was cocreating a third event of time where both version of me was a part of. it was not really a predestination paradox but rather a predestinaiton effect as it did not violate physics because as i saw my erlier self, i was reciving information from the past, and as i saw my future self, i was reciving infirmation form the future before it happend. actually it chould have been a paradox that way since the future version of me was a progession into the future and chould never have been able to interact with the past. it seems like a third timeline branced of in that moment where the memories of both event of me was wired into me in a separate timeline where i have two sets of memories, my past self and my future self, both retro reflections in my head at the same time. after that, i experience a lot of anomalies putting my life in danger. i never felt the same after that. still now, i sometimes see things normal things that suddently vanish into thin air is it never existed in the first place, as well as improbable events of animals on the road in places and temperatures that are extremly unlikly to happend. the strange part is that i was not dreaming but many times i saw real things behaving is if they was part of a dream but was real because i was awake at the time i experieced it. if i was to recall a dream i would like in some of the real events i experienced as if the real world is also a dream but where im not the one whos dreaming but someone else is. i believed that it was inpossible for information of past and present to progress in the same timeline as we experience time, but that does not seem to be true, at least it seems like our understanding and sense of time is wrong, and that time is somthing that can be molded and that in a higher dimention of time our past present and future is like clay and can be stirred together creating an infinite amount of possible brances of time. maybe this is why we see so much strange looking stuff from the ancient ancestors of mankind looking like lots of technological innovations of the future is present in the past. maybe the ancients had contact with people from the future trough events simmilar to the one i experienced and that they either got a kickstart to their civilisation or at least could draw images of future technology in their time. maybe we can even optain information form the past, by a clash of time events where we can learn what they knew in the past so we can color our future with what they knew as if it happend for real. i can not explain what i experienced in any other way. its stil a mystery to me f what is time. it seems like conciousness can breach trough time but where the physical stuff can't.
No, absolutely No, when You know the simple nature of time, then You'll understand.
But later I shall tell some thing interesting, about this subject.
Why am I reminded of Dr. Rush from Battlestar Galactica? What irony.
If time travel were possible, it would already have happened and people from the future would have already visited our time line.
BTW... it is not possible.
Yes
Not backwards, but stasis fields are possible.
@@b.m.c.2601 Agreed. Stopping time and manipulating relativity is possible, but reversing the flow of time is impossible.
Time travel is BS. We don't even know what time is. And from Einstein's original argument I say time is constant. The speed of light is not constant or we wouldn't have rainbows
What sane person has a haircut like that?
Awesome content, awful editing. I just needed 5 minutes to get rid of the annoying "peep" and normalizing the sound volume. Why o why can't you, producer?
*Is Time Travel Possible?*
*No!*
+H. CodeName If you mean like a DeLorean then I think you are probably right. But you can go to near lightspeed or in a strong gravitational field to slow your own time while the rest goes faster.
Sith Smasher
Is it practically possible to go to near light speed or in a strong gravitational field?
H. CodeName
Theoretically yes, but you need huge amounts of energy. I guess we will have a clearer answer to that question if technology is able to produce and store large amounts of antimatter. Not in our lifetime though I think...
There's tiny but measurable time dilation caused by Earth's gravity and velocity, and even your own walking speed. You don't need 99% of lightspeed or a black hole to prove the concept of differing rates of time travel forwards.
Backwards is trickier. Physics equations seem to allow events to work forwards or backwards equally. So maybe the universe could run backwards without problems. (And maybe sometimes it does, maybe we wouldn't know.) But how do you make one piece of it run backwards? And then what?
Maybe you CAN run your little bubble backwards, but idk how that would take you to meet your grandfather. IDK what the past "is." Idk if it still exists. The universe has moved on. If it's not there anymore, you can't go to it. Unless you make the whole universe go backwards.
OTOH maybe block time is a thing, in which case the past is just as real as any place. But block time would seem inviolable... Observers can disagree about when but not whether something happened. It would kinda break the universe.
IDK but I might bet that sufficiently clever monkeys can figure out a way to make a finite bit of spacetime, like you and your deLorean, evolve backwards in time. You couldn't go to the past, but you could live backwards and erase memories and unspill the milk and so on inside the bubble. If you could then go back to "normal" (seems weird to make decisions and take actions going backwards- maybe you can't), you'd be younger, and those years would have never happened to you, despite maybe your friends and parents and high school year book remembering that it did happen. Not the kind of time travel people want - you want to remember the future and kiss that one girl you never kissed - but maybe less impossible.
He wares dresses at nite!
Where is it mandated that "God" and/or the forces of nature always and forever have to act logically? They certainly might, but where is it mandated that they always and forever have to?
No god
+David Heller You should read some of my other comments on this video post. I show how it is most probable that a conscious somethingness is most probably how we came to be.
Maybe a super entity programmed us and the universe with randomness and non randomness a highly sophisticated computer simulation that we found code in.
+David Heller Maybe. And just as the forces of nature might "evolve" one day and wipe out the universe and all in it, it would be just as if the computer was turned off or had a power failure. We all could be gone in the blink of an eye and maybe even in the very next moment of time.
We either have an actual eternal conscious existence (whatever those concepts actually mean in reality), or we don't. Currently it appears that we don't. Life itself is just an illusion anyway (computer simulated or not) from the human perspective as far as eternity is concerned, or so it currently appears.
There have been deaths of people getting struck by meteors. In Russia one just flew down.
Whatever the Voice of God puts in your conscious mind to experience is all you get. God has many worlds for each of his created beings to explore.
Prove it
yakedup
Your body will have to die in the world that you're perceiving as real before you hear the Voice of God in the next part of the program. There is no proof that the Voice of God exists. It's something you have to experience and learn from to understand it.
+yakedup That's the problem. They can't, because it's a fairy tale.
Sith Smasher
Scientists have no proof they are a living being, either. The proof they think they have is only an illusion that keeps changing until it's burned up. Once it's burned up, they have no proof that what they were looking it is real.
+Brad Holkesvig we are living in a simulation created by advanced beings.
Interesting but he needs to cut that hair off. Oh boy.
What kind of fucking hairstyle is that
Seems like the classical "I'm going bald but don't want to admit it to myself yet"
There is no such thing as time travel because time is not space. We use metaphors of space to describe time because time is so abstract. But then, we get confused by our own language (the map is not the territory). Time is just a unit of measurement of how long events take to happen. In the future, when the human race is more enlightened, people will look back and laugh at us.
stupid comment.
Check out special and general relativity.
is time travel to past future really possible and how please tell can u help me out to do