Quantum Tunnelling time travel.

[Gingerbread Demon]

I just thought I'd leave these here, the catchy headlines got me but I think there is plenty more to find if I dig more. The idea of using QT for time travel seems interesting though.

https://www.telegraph.co.uk/news/sc...-machine-allows-paradox-free-time-travel.html

and

https://yourtimetravelexperience.com/quantum-tunneling-explained

 

[StarCruiser]

I really doubt that any form of travel to the past is possible since the past no longer exists. Traveling forward - just go very fast...

 

[Gingerbread Demon]

I really doubt that any form of travel to the past is possible since the past no longer exists. Traveling forward - just go very fast...

Fast travel into the future may be the only option since going back into the past likely would need us to break physics.

 

[Gingerbread Demon]

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Is very interesting

 

[Asbo Zaprudder]

I really doubt that any form of travel to the past is possible since the past no longer exists. Traveling forward - just go very fast...

Not according to Einstein and Minkowski, where both the past and the future both exist (as a result of Special Relativity; there being no universal now) in a block universe. It is this aspect of SR that makes it incompatible with quantum mechanics.

https://en.m.wikipedia.org/wiki/Eternalism_(philosophy_of_time)

Of course, there are alternative philosophies.

https://en.m.wikipedia.org/wiki/Growing_block_universe

 

[XCV330]

It's an interesting idea, but how would one test it? So you find a way to travel back in time and save Abraham Lincoln at Ford's theater. The minute you somehow get back where you came from you seem to have sidestepped whatever chain of causation you've caused because postselection. You could travel back again and see those events and maybe live through the changed circumstaces as the unfold but it would not effect your relative present. Or something.

Causation has always been kind of the burr in the saddle with time travel. Though I will admit, I don't understand sometimes why its important. If time is an infinite multidemensional tableau and not either some primary solitary rail, sanctified and unable to be disturbed, or a train whose tracks are laid at one track per hour (making no sense in a relative universe.. whose hour? whose frame?) then causation is a polite way for people who live with 3 dimensions and a single time understanding to sort it all out. Not that the universe ever REALLY makes sense, deep down inside.

in this tablau einstein rosen bridges to whenever seem as plausible as wherever, again making one wonder what this trouble with causation was in the first place. If time travel is possible someone, something, or some cosmic affect has already done it many many times. and we're still here, or at least we think we are which is good enough. You will shouldn't have a baby with your grandmother back in time. That's just wrong.

 

[Asbo Zaprudder]

Acoording to one hypotheseis, a multiverse gets rid of the paradoxes to do with time travel -- you travel back and alter a different reality. Recently, someone has shown that inconsistency of timelines might be possible in QM. History need not agree for different people.

Makes me wonder if this is a possible explanation for people I believed having died years ago seemingly still being alive and for a certain historic disaster having taken place on a different day from what I remember. More likely, my memory is faulty as I have no physical record to confirm my version of events.

 

[Gingerbread Demon]

Acoording to one hypotheseis, a multiverse gets rid of the paradoxes to do with time travel -- you travel back and alter a different reality. Recently, someone has shown that inconsistency of timelines might be possible in QM. History need not agree for different people.

Makes me wonder if this is a possible explanation for people I believed having died years ago seemingly still being alive and for a certain historic disaster having taken place on a different day from what I remember. More likely, my memory is faulty as I have no physical record to confirm my version of events.

Is that like the so called "Mandela Effect" where people supposedly have two different memories of his life?

 

[Asbo Zaprudder]

Is that like the so called "Mandela Effect" where people supposedly have two different memories of his life?

The effect is supposedly psychological rather than objectively real.

 

[Gingerbread Demon]

The effect is supposedly psychological rather than objectively real.

Oh I know that. It's just one of those curious things that have become a popular thing.

 

[Asbo Zaprudder]

Never underestimate the ability of the human mind to deceive itself.

 

[Steven P Bastien]

Never underestimate the ability of the human mind to deceive itself.

What if you should sometimes underestimate that ability, and you have just deceived yourself into thinking that you should never do that?

 

[Asbo Zaprudder]

What if you should sometimes underestimate that ability, and you have just deceived yourself into thinking that you should never do that?

Gödel only knows.

 

[Dryson]

You cant rewrite the past, period end of story because the past has already taken place and is not stored in two mirrors facing each other.

 

[Gingerbread Demon]

You cant rewrite the past, period end of story because the past has already taken place and is not stored in two mirrors facing each other.

Not if it's a quantum mirror j/k

 

[Asbo Zaprudder]

Are we talking Fabry–Pérot étalon or something more exotic?

 

[Gingerbread Demon]

T'was a joke

 

[XCV330]

would a quantum rear-view mirror have a sticker that says "Objects in the mirror may have either location or velocity displayed"

 

[Asbo Zaprudder]

T'was a joke

I know. I was intending to reply to the previous poster -- kind of pointless as it turns out that I'm invisible to him.

 

[GNDN18]

By Dennis Overbye
May 8, 2019

Using an IBM quantum computer, they managed to undo the aging of a single, simulated elementary particle by one millionth of a second. But it was a Pyrrhic victory at best, requiring manipulations so unlikely to occur naturally that it only reinforced the notion that we are helplessly trapped in the flow of time.

Most of us already sense that the atoms of a scrambled egg can’t be unscrambled back inside a pristine shell. Now it seems that, under general conditions, even a single particle probably can’t go backward without help and careful tinkering.

More at the New York Times: https://www.nytimes.com/2019/05/08/science/quantum-physics-time.html?smid=nytcore-ios-share