I actually watched this tomorrow.

"We dont serve particles that move faster than light" A tachyon comes into a bar.

I'm Jacob Godier watching this on the Titanic. I just wanted to comment before we go down how proud I am of my great great grandson John. Good job son.

I love how John has a seemingly endless supply of video topics to make that are always as interesting as the last. Keep on killing it my guy.

I can't believe it took me until 2032 to find your channel!

Goodnight y'all

“A message came through as soon as the machine was activated, before the scientists could send their first question. The response itself was worryingly brief, containing only four words: TURN THE MACHINE OFF.”

I travel backwards in time whenever I want. To be clear, time is still going forward, I'm just facing the other way.

Option 1: The entangled particle updates its state to the other particle FTL. Option 2: The entangled particle updates its state to the other particle backwards in time. I say: What's the difference? Great show, John!

Thanks Jhon. These video reminds me of one of my favorite Xfiles episodes "Clydebruckman Final Repose" when he says "What happen if i help you, and then, you help the mother of the time machine inventor? , he would go back in time and The US never invade Granada" its something like the future changing the past

saving this one for my late night watch, title already has me excited

Help! I'm stuck! Everyone is zipping past me at the normal speed of time, while I'm stuck in the Nervous Breakdown Lane, going nowhere. And it's a Studebaker, not a DeLorean. And I kinda feel like a character trapped in a Franz Kafka story.

If we set up a way to communicate with the future the first message could be "Be excellent to each other and party on, dudes!" followed by a kickass guitar solo.

John, this was so good I had to listen to it 3x IN A ROW. Never done that before on any video on KZfaq, ever. Your content is some of the densest, and thought provoking on KZfaq. An instant click from me!

LOVE THIS ONE!

Just in time

My brain hurts.

What kind of time travel is it when you wake up in the middle of the night and are having trouble going back to sleep so you open YT to play something soothing only to see JMG!s latest video dropped 46 seconds ago?

A world with a changing history. Sounds like madness.

I got up and walked in a circle twice during this video. It was intense. But I just couldn't walk backwards

Retrocausality (or time-independent causality) is my preferred explanation of entanglement. I don't believe time's arrow is truly fundamental; a newly created particle only acquires this "forward" temporal direction through interactions between particles. Think of it like placing a leaf on a stream: the molecules of the leaf initially have no preferred direction. They only acquire momentum in the same direction as the stream due to the net motion of water molecules around them. This is why entanglement appears to act instantly; information about particle interactions travel in every temporal direction until the particle gets caught up in the current. This is also why quantum effects disappear and entropy appears as a result of measurement.

Another awesome video JMG 💙

From what I understand, many people, including some physicists misunderstand how quantum entanglement works. It actually does not violate the speed of light. It requires the receiver particle to be placed prior and then you know it's rotation is the same or opposite from the entangled receiver particle. It's like this. You give Jimmy and Mary a letter each. One has an up arrow, the other had a down arrow. You randomly give each of them their letter. They go on their separate ways, Jimmy to New York City, and Mary to Paris. Jimmy opens his letter to find it is an upwards arrow, meaning Mary's is down. No speed of light violations were caused here because they had to travel at non-relativisitc speeds to get to their new positions.

Fascinating stuff! Thanks, John!!! 😃 Stay safe there with your family! 🖖😊

Whose gonna tell JMG that his grandparents didn’t really need to be married…

Excellent explanation! Needs to be added to the mindblown playlist. Thanks again!

That was an amazingly interesting video. Thanks jmg.

Thank you so much for ideas herein that I hadn't yet heard - such as retroactive causality - love it :) love your programs really get a person thinking. Will be watching this one several times to take it all in.

Mind bending stuff, JMG!

PSA: Einstein's "spooky action at a distance" wasn't about quantum entanglement. He was talking about the supposed "collapse of the wave function". He thought that because the actual collapse is not observable, it can't be real. Quantum entanglement doesn't mean doing something to one quantum particle affects another particle. Instead, think of it like how if you break a cookie in half, you only need to look at the jagged edge of one half to know what the other half's jagged edge looks like. The properties are correlated, and no matter how far you separate the two halves of the cookie, there will always be that correlation. But if you do something to one half of the cookie, nothing happens to the other half. There is no "action" in a correlation.

That was freaking fascinating. Thanks, man!

You have surpassed previous posts I must relisten to, this one will take several listens. From in the past I praise you :)

Thank you for the video the topic was very interesting & fascinating.

Just before bedtime, perfect timing once again.

Back to back!! Such a great day!

These vids are like time travel...I put them on and next thing I know it's morning.

Considering watching this yesterday

john Mikey godchild!! thanks for the upload :)

HOLY SHIT THE END OF THIS STARTED BLOWING MY MIND LOVE YOU JMG

QE isn't what Einstein referred to with "spooky action at the distance". He referred to wave function collapse.

I actually just went and saw the Back to the Future musical a week ago and it was fantastic! It stuck remarkably well to the source material, though what changed was totally valid. Their practical effects work to get the car scenes to function was on point.

Can we get a "Here Are Ten Spooky Messages You Don't Want to Receive From the Future" video?

Stephen Baxter actually used a similar thought experiment as a big chunk of his sci Fi novel Exultant back in 2004. The characters built a CTC computer. They verified it's function by getting the answer to a complex mathematical problem from the future. Baxter uses a lot of theoretical quantum stuff in his books. Fun stuff to read.

Create a gauge theory of time to quantize time using the Weyl Group as the gauge group. You can incorporate the effects of Closed Timelike Curves by using winding numbers that sum over looping paths either forwards or backwards around the Closed Timelike Curve. If time is quantum, you can have indeterminate causal structures and potentially entanglement within temporal fields. Also check out the two state vector formalism / transactional interpretation.

Retro-causality sounds like a misnomer. In order to cause anything you need to interact with it. That means 'sending' some form of information, which isn't allowed at rates faster than the speed of light; It sounds more like you're measuring a predetermined outcome. A hidden variable. You're not shaping the past, but only coming to know it.

Wow. Excellent video and great thought experiments. Also related, at a recent family gathering I compared the stainless steel of the Delorean to the cybertruck. Still love that Delorean tho.

Curling is a surprisingly interesting sport to watch.

My brain fried from this video. This needs an animation my man.

Someone should conduct a time experiment at my in-laws house because i swear time slows down to a complete stop whenever im there. Maybe it has something to do with that huge life sucking object that nothing can escape from? Anyway enough about my mother in-law.... I do wonder why as individuals we can perceive time differently, for example when were enjoying ourselves time moves so fast but when were bored or dont want to be somewhere time seems to slow down. An old work colleague once told me to keep busy all day because it brings hometime quicker. John thanks for the great content as always, you're one of the best to ever do it.

Delightful, paradoxically!

Super interesting!

Thank you teacher!

10:48 I had another argument about this, but then you told me tomorrow so yesterday I changed my mind🤯

We cant travel back in time, but information from the past travels into the future at a relative rates. We can peer into the past as a crystal, or a mirror. We can predict the future by measuring the crystal as it forms in real time.

Messages from the future was the plot of "Thrice upon a time"

You can't send messages with entanglement because you can't measure or alter the state of the particle without breaking the entanglement, so even without time-travel; you will just share new random knowledge about the particle but not actually "write" anything in the particle in a way that the entanglement survives.

3:25 I think there are two aspects of timelines at play in a possible backward time travel scenario. I'll call them a "fixed" time line, and a "variable" timeline. The first only comes into play with the time traveler if the grandparents issue comes up, VIZ: the universe is structured in such a way that is impossible to do. This applies to all causality events related to the vanishing of the individual doing the time traveling. Then there are the decisions and events that DON'T affect the individual (the case of Andrew Carlssin seems to bear this out) they are unaffected by the first "fixed" timeline, and thus, create an alternate universe with that specific variable being changed.

This just seams to end up with exactly the same problem as regular quantum entanglement communication, ie you can't watch an entangled particle to see if it changes because that is a measurement. So as soon as you watch it, you collapse it's wavefunction and you will never know whether it was you or your communication partner, either separated by distance or time, who collapsed it first and since the collapse to a specific state is random, how can it carry meaning? You can't wait for a particle's state to collapse or choose the state it collapses to.

Retrocausality! Wheee!! 💫🤓💫

The idea of backward time has already been widely explored, JMG. For instance, I posted this comment three days before you uploaded this video.

Mind blown!

Damn this one was 🔥🔥🔥

Right off to work

General relativity and quantum mechanics will never be combined until we realize that each individual observer is observing them both at different moments in time. Because causality has a speed limit (c) every point in space where one observes it from will be the closest to the present moment. When one looks out into the universe they see the past which is made of particles (GR). When one tries to measure the position of a particle they are observing smaller distances and getting closer to the present moment (QM). The wave property of particles appears when we start trying to predict the future of that particle. A particle that has not had an interaction exists in a future state. It is a probability wave because the future is probabilistic. Wave function collapse is what we perceive as the present moment and is what divides the past from the future. GR is making measurements in the observed past and therefore, predictable. It can predict the future but only from information collected from the past. QM is attempting to make measurements of the unobserved future and therefore, unpredictable. Only once a particle interacts with the present moment does it become predictable. This is an observational interpretation of the mathematics we currently use based on the limited perspective we have with the experiments we choose to observe the universe with.

Fun fact: retrocausality used to work. It reached a saturation point at which most antimatter was annihilated and dark energy and dark matter were created.

Retrocausality. I loved your scenario and the experiment. I would not be surprised if there is some way to test this in the future. Or should I say past...

I love your channel, for one because your videos get me to think about things I had no idea about. About the grandfather paradox if we go back in time. I've heard that we just go on different timelines if we change something in the past. Like, if we convinced our grandparents not to marry, it would set them on a different timeline. Much like observing something changes it. Also, with all due respect, I think we're finding out from JWST we don't know a whole lot about the universe, much less black holes.

As soon as someone (or some group) invents backward time travel, other people from the future are going to go back and try to take over time travel for themselves, possibly taking away credit for the invention for themselves. The movie "Primer" explains this well, for such a low budget film. In other words, if you invent time travel, you are doomed to defend that invention for eternity.

Uroboros. The universe is a sphere. The curvature is moving FTL, self-sustaining itself. Immortality. So cool.

I was about to argue time moving forward for everyone but decay would argue that the dead don't escape time, they're just unaware of it's passage.

Man, for all we know, the Annunaki could have been future humans and ALL of humanity could be a bootstrap paradox. Wouldn't THAT be a mindfuck?

I'm all for retrocausality but only for photons (and other massless particles). Massive particles should behave differently because they can't travel at c.

The biggest issue I see with any form of time travel is that, when free will is introduced, it would be incredibly easy to induce a paradox state. Example: Say, in the Twin Paradox, your younger twin decides after seeing you, that he/she does not want to continue the journey. Why? Because why not see what happens, obviously. Well… what happens? The most logical explanation given the evidence presented by the double-slit experiment is that at the very moment when the paradox is introduced, the fabric of reality itself would alter and you would not have any recollection of meeting yourself, only that you have decided to not continue. Photons LITERALLY will retroactively change their states after passing through the slits when observed. Reality, as far as I can tell, is able to read and write information without respect to time or the conventional laws of physics. My personal running hypothesis is that any attempts to “break the game” as it were and for lack of a better phrase (my reticence comes from the fact that I don’t want to get into Simulation Theory right now and I fear that turn of phrase will inevitably become the focus) will be corrected in some manner imperceptible to us. Schrödinger’s cat *has* a determined state - let’s say alive - but if we muck with the variables too much then it’ll go from being alive to being and HAVING ALWAYS BEEN dead. As if reality itself holds a grudge against us for our observations. This mysterious universe is more strange and wonderful than I think any of us really could ever know.

If you think of space as a 4D hyper-spheroid where time loops back on itself at a smaller scale than the other dimensions and where the forward motion of time is emergent at the scale we live. This is basically the premise of closed time-like loops, this can also help to explain the non-locality of the universe hinted at by entanglement.

I really enjoy thinking about the infrastructure of the universe

nice😊

So the three theories on quantum entanglement are: 1. It's spooky (A. Einstein) 2. Information moving FTL. 3. Information going backwards in time. Might I add: 4. The information is set at the time of the entanglement and we have a fundamental misunderstanding of quantum uncertainty? I mean that's very vague and unhelpful but, of the four, it seems the most likely so using that as a negative data point might open up whole new vistas of research.

I have a time traveling t-shirt, it takes me forward in time at the speed of clock.

Could FTL tachyons traveling back through time have collided with something to trigger the big bang in a retrocausal, mind bending event? Does this mean my bedtime is quantum entangled with JMG's video release? Aaaghh!!

What about this: I have 16 tubes each one containing one entangled particle. You, on the other side of the universe, have 16 tubes each containing its pair. I want to tell you "Hi" so I break the entanglement in a specific order to represent the binary equivalent. Ex. Entangled = 0 Not Entangled = 1 Your machine then sees which particles are still bonded and displays 01001000 01101001 (Hi)

One thing, the twin paradox is not just that one twin ages. But it's that from each twin's perspective, the other twin ages - which is impossible because when they meet they can compare the ages, and at least one of them has to be wrong. This is a paradox because it cannot happen, and yet the theory of relativity appear to be predicting it.

Time, Dr. Freeman? Is it really that time again? It feels as if you only just arrived.

I think time travel could be possible but any changes wouldn't effect the timeline you came from but will start a alternate and separate timeline from that point onwards.

The man.🤘😆🤘

Imagine if we were to prove that this is possible, yet when we go to turn it on, we hear nothing. Would this imply that at some point in the future, Humanity had gone extinct? Or, imagine we could determine a date after which no messages from the future are received. Might we have just foreseen the date of humanity's extinction event?

Yes! 51 seconds since posting I’m the first to watch! :) Love your videos I listen to them on my way to wooooooooooork. :)

The Einstein-Rosen Bridge, also known as an ER bridge or wormhole, is a theoretical concept in physics that proposes a connection between two distant points in spacetime. The ER bridge is a result of the collaboration between Albert Einstein and Nathan Rosen in the 1930s. They hypothesized that these bridges could connect two black holes, effectively creating a tunnel through spacetime. The concept of ER bridges has been linked to quantum entanglement through the ER=EPR conjecture. This conjecture, proposed by physicists Juan Maldacena and Leonard Susskind, suggests that entangled particles are connected by a wormhole, effectively creating a bridge between them. This bridge is not a classical, physical connection but rather a quantum mechanical one, where the entangled particles are linked through their shared quantum state. In essence, the ER bridge as entanglement implies that when two particles are entangled, they are connected by a quantum wormhole. This wormhole allows for instantaneous communication between the particles, even if they are separated by vast distances. The entanglement creates a shared quantum state that transcends spacetime, effectively linking the particles in a way that defies classical notions of distance and communication. This concept has significant implications for our understanding of quantum mechanics and general relativity. It suggests that spacetime itself could emerge from quantum entanglement and that the mysteries of entanglement could be resolved by understanding the geometry of wormholes. The ER=EPR conjecture has sparked significant interest and research, as it potentially bridges the gap between quantum mechanics and general relativity.

Forward in time? No, back to the future.

2:25 Such a wholesome show that it borders on unscientific. Marriage doesn't make children; the birds, bees and often storks do. Try to avoid involving the Shoe-bill as it doesn't handle twins well.

Hold my beer. John dropped todays videooo lets go

The reason why I have never believed that backwards time travel is possible is not the issue related to paradoxes, for me personally the solution to the paradoxes that might arise is your own frame of reference. You go to your past but the past to which you travelled to has now become your future and thus even if you kill your younger self or your grandfather it would not have a retroactive effect upon you. However, in my mind, the issue with backwards time travel has always been related with the question "does the past exist anymore?". The past would have to be "recorded" (pardon the modernist digital era semantics, cannot think of a better word than "recorded") or "stored" somewhere in order for you to "access" it. Does not matter if one means "travel" to the past or "reverse" time, locally or otherwise, although "reversing" entropy for the whole universe seems like an even greater impossibility that just you "travelling" to the past. Sure, if we are talking about parallell universes then yes, you could "access" that past timeline, but if we are not talking about a multiverse (which I do not think it exists as it opens a whole new can of worms of paradoxes) or new branches of universes being constantly created, but just this single universe, then time travel seems impossible. I am aware these concepts cannot be presented In detail in a KZfaq comment but I hope you get what I mean. [Disclaimer] I am not a physicist, neither a physics philosopher, these are just my personal thoughts based on "intuition" let's call it, I do not pretend to know anything more than anyone else on this subject.

I wonder if Deja Vu is actually save points

If backwards time travel was possible the universe would quickly be filled with time travelers from every possible future where someone successfully time traveled

*Walks in with sunglasses and a cigarette* Ya’ll seen the toroid yet? No? Oh, drag.

🤯🤯🤯🤯

There was a low-budget indy film many years ago (I forget the title) about a team who create a time machine that is able to send them back in time only as far as the machine itself existed. They stored it in a rental storage unit but then some shadowy group or agency was hounding them about it and they descended into paranoia. Reminds me of this. Was supposed to be based on real, if speculative, science as one of the film makers who was also one of the actors was a STEM major or something.

"All you need is a LeBaron..." Okay, now what?

Message from the infinite future: "We're still waiting for GTA VI"

Einstein theories don't 'allow' anything. Simply gives the most accurate description of what happens

9:23 precisely.