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Is Time Travel Possible?| Explore


The BBC’s long-running science-fiction series Doctor Who, celebrating its 50th anniversary on 23 November, centres on its eponymous character’s adventures through time and space. But could he really skip between different periods of history at will?

Travelling forwards in time is surprisingly easy. Einstein’s special theory of relativity, developed in 1905, shows that time passes at different rates for people who are moving relative to one another - although the effect only becomes large when you get close to the speed of light.

If one were to leave Earth in a spacecraft travelling at an appreciable fraction of lightspeed, turn around and come back, only a few years might have passed on board but many years could have gone by on Earth. This is known as the “twins paradox”, since a traveller undertaking such a journey would return to find herself much younger than her twin.

There’s only one problem from anyone wishing to get a glimpse of the future – getting back. It would mean travelling faster than light – and that’s not possible.

But there may be an out to be found in general relativity, Einstein’s theory of gravity that unites space and time as “spacetime”, which curves in the presence of mass. It allows for the possibility of wormholes – a kind of tunnel through spacetime connecting otherwise very distant parts of the universe.

If the “mouths” of the wormhole are moving relative to one another, then traversing the bridge between different points in space would also take a traveller to a different point in time to that in which she started.

However it would still be impossible to go back further in time than the point at which the wormhole was created, limiting the options for travel somewhat - and possibly explaining why we haven’t encountered any visitors from the future. If any natural wormholes were formed in the Big Bang, it might be possible to travel to a limited number of points in the past and in the distant universe, but wouldn’t enable one to flit around the cosmos at will as the Doctor seems to do.

More restrictively still, theoretical work by Kip Thorne of Caltech using a partial unification of general relativity with quantum physics suggested that any wormhole that allows time travel would collapse as soon as it formed.

Thorne did, however, resolve an apparent issue that could arise due to by time travel (within the confines of general relativity). The “grandfather paradox” involves going back in time and accidentally killing one’s grandfather before one’s father is conceived - preventing one’s own birth, making it impossible to go back in time and kill one’s grandfather. Thorne found that for point masses traversing a wormhole, no initial conditions create this type of paradox.

That’s good news for anyone worried about people going back and changing the past willy-nilly, but bad news for any Whovians hoping to reverse the decision to cancel the show in 1989 and prevent a 16-year hiatus. That would probably be beyond even the Doctor himself.

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[Elon Musk responds to Twitter time travel conspiracy: 'Full disclosure, I'm actually a 3,000 year old vampire']
By
Emma Rose
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February 26, 2020
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Elon Musk has dismissed a long-running conspiracy theory among his Twitter followers that the secret to his success is time travel, with the billionaire claiming he is instead a vampire.

The joke stems from an image of Raymond Collishaw, a World War I fighter pilot who bears a striking resemblance to the Tesla chief executive.

Collishaw died in 1976 – five years after Musk was born – but the image is often used as “proof” that the entrepreneur is a time traveller, capable of picking out trends such as online payments (PayPal) and private space travel (SpaceX) long before they are established insustries.

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“Why were you in Canada in 1914, why was your name Raymond Collishaw and why was your occupation ace fighter-pilot,” one of his Twitter followers asked, after Musk tweeted about preparations to a SpaceX launch.

Musk responded: “Full disclosure, I’m actually a 3,000-year-old vampire. It’s such a trial assuming all these false identities over the centuries!”


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Fellow tech bosses have been among those to question Musk’s uncanny ability to make money through future-facing technology.

In 2017, former Twitter chief executive Dick Costolo told CNBC: “Elon may be proof that time travel exists, because he seems to have either more hours in the day than the rest of us have, or he’s from the future.”

He continued: “In all seriousness, I’m laughing because [Musk’s] ability to think cogently and thoughtfully about such a wide range of topics, while running these multiple companies, and seeming to be running them well is just, I mean, it makes you shake your head. It’s remarkable.”

While the Elon Musk-time travel conspiracy is clearly tongue-in-cheek, some scientists say the concept of time travel is theoretically possible.

A 2017 study in the journal Classical and Quantum Gravity stated that it was “mathematically possible” to travel “backwards and forwards through time and space, as interpreted by an external observer”. There is, however, a caveat.

Researcher Ben Tippett said at the time: “While it is mathematically feasible, it is not yet possible to build a space-time machine because we need materials – which we call exotic matter – to bend space-time in these impossible ways, but they have yet to be discovered.”

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SCIENCE
Paradox-Free Time Travel Is Theoretically Possible, Researchers Say

September 27, 20208:44 PM ET
Matthew S. Schwartz 2018 square
MATTHEW S. SCHWARTZ

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A dog dressed as Marty McFly from Back to the Future attends the Tompkins Square Halloween Dog Parade in 2015. New research says time travel might be possible without the problems McFly encountered.
Timothy A. Clary/AFP via Getty Images
"The past is obdurate," Stephen King wrote in his book about a man who goes back in time to prevent the Kennedy assassination. "It doesn't want to be changed."
Turns out, King might have been on to something.
Countless science fiction tales have explored the paradox of what would happen if you went back in time and did something in the past that endangered the future. Perhaps one of the most famous pop culture examples is in Back to the Future, when Marty McFly goes back in time and accidentally stops his parents from meeting, putting his own existence in jeopardy.
But maybe McFly wasn't in much danger after all. According a new paper from researchers at the University of Queensland, even if time travel were possible, the paradox couldn't actually exist.
Researchers ran the numbers and determined that even if you made a change in the past, the timeline would essentially self-correct, ensuring that whatever happened to send you back in time would still happen.
"Say you traveled in time in an attempt to stop COVID-19's patient zero from being exposed to the virus," University of Queensland scientist Fabio Costa told the university's news service.
Article continues after sponsor message


"However, if you stopped that individual from becoming infected, that would eliminate the motivation for you to go back and stop the pandemic in the first place," said Costa, who co-authored the paper with honors undergraduate student Germain Tobar.
"This is a paradox — an inconsistency that often leads people to think that time travel cannot occur in our universe."
A variation is known as the "grandfather paradox" — in which a time traveler kills their own grandfather, in the process preventing the time traveler's birth.
The logical paradox has given researchers a headache, in part because according to Einstein's theory of general relativity, "closed timelike curves" are possible, theoretically allowing an observer to travel back in time and interact with their past self — potentially endangering their own existence.
But these researchers say that such a paradox wouldn't necessarily exist, because events would adjust themselves.
Take the coronavirus patient zero example. "You might try and stop patient zero from becoming infected, but in doing so, you would catch the virus and become patient zero, or someone else would," Tobar told the university's news service.
In other words, a time traveler could make changes, but the original outcome would still find a way to happen — maybe not the same way it happened in the first timeline but close enough so that the time traveler would still exist and would still be motivated to go back in time.
"No matter what you did, the salient events would just recalibrate around you," Tobar said.
The paper, "Reversible dynamics with closed time-like curves and freedom of choice," was published last week in the peer-reviewed journal Classical and Quantum Gravity. The findings seem consistent with another time travel study published this summer in the peer-reviewed journal Physical Review Letters. That study found that changes made in the past won't drastically alter the future.
Bestselling science fiction author Blake Crouch, who has written extensively about time travel, said the new study seems to support what certain time travel tropes have posited all along.
"The universe is deterministic and attempts to alter Past Event X are destined to be the forces which bring Past Event X into being," Crouch told NPR via email. "So the future can affect the past. Or maybe time is just an illusion. But I guess it's cool that the math checks out."
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SCIENCE
Paradox-Free Time Travel Is Theoretically Possible, Researchers Say

September 27, 20208:44 PM ET
Matthew S. Schwartz 2018 square
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Twitter


A dog dressed as Marty McFly from Back to the Future attends the Tompkins Square Halloween Dog Parade in 2015. New research says time travel might be possible without the problems McFly encountered.
Timothy A. Clary/AFP via Getty Images
"The past is obdurate," Stephen King wrote in his book about a man who goes back in time to prevent the Kennedy assassination. "It doesn't want to be changed."
Turns out, King might have been on to something.
Countless science fiction tales have explored the paradox of what would happen if you went back in time and did something in the past that endangered the future. Perhaps one of the most famous pop culture examples is in Back to the Future, when Marty McFly goes back in time and accidentally stops his parents from meeting, putting his own existence in jeopardy.
But maybe McFly wasn't in much danger after all. According a new paper from researchers at the University of Queensland, even if time travel were possible, the paradox couldn't actually exist.
Researchers ran the numbers and determined that even if you made a change in the past, the timeline would essentially self-correct, ensuring that whatever happened to send you back in time would still happen.
"Say you traveled in time in an attempt to stop COVID-19's patient zero from being exposed to the virus," University of Queensland scientist Fabio Costa told the university's news service.
Article continues after sponsor message


"However, if you stopped that individual from becoming infected, that would eliminate the motivation for you to go back and stop the pandemic in the first place," said Costa, who co-authored the paper with honors undergraduate student Germain Tobar.
"This is a paradox — an inconsistency that often leads people to think that time travel cannot occur in our universe."
A variation is known as the "grandfather paradox" — in which a time traveler kills their own grandfather, in the process preventing the time traveler's birth.
The logical paradox has given researchers a headache, in part because according to Einstein's theory of general relativity, "closed timelike curves" are possible, theoretically allowing an observer to travel back in time and interact with their past self — potentially endangering their own existence.
But these researchers say that such a paradox wouldn't necessarily exist, because events would adjust themselves.
Take the coronavirus patient zero example. "You might try and stop patient zero from becoming infected, but in doing so, you would catch the virus and become patient zero, or someone else would," Tobar told the university's news service.
In other words, a time traveler could make changes, but the original outcome would still find a way to happen — maybe not the same way it happened in the first timeline but close enough so that the time traveler would still exist and would still be motivated to go back in time.
"No matter what you did, the salient events would just recalibrate around you," Tobar said.
The paper, "Reversible dynamics with closed time-like curves and freedom of choice," was published last week in the peer-reviewed journal Classical and Quantum Gravity. The findings seem consistent with another time travel study published this summer in the peer-reviewed journal Physical Review Letters. That study found that changes made in the past won't drastically alter the future.
Bestselling science fiction author Blake Crouch, who has written extensively about time travel, said the new study seems to support what certain time travel tropes have posited all along.
"The universe is deterministic and attempts to alter Past Event X are destined to be the forces which bring Past Event X into being," Crouch told NPR via email. "So the future can affect the past. Or maybe time is just an illusion. But I guess it's cool that the math checks out."


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The "journalists" writing these stories should all go back in time 9 months before their birth, and punch their father in the dick.
 

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PHYSICISTS PROVE TIME TRAVEL IS ‘MATHEMATICALLY POSSIBLE’
Australian scientists say they have ‘squared the numbers’ of the grandfather paradox

Anthony Cuthbertson@ADCuthbertson
Wednesday 30 September 2020 17:47


Scientists in Australia claim to have proved that time travel is theoretically possible after solving a logical paradox.
Physicists from the University of Queensland used mathematical modelling to reconcile Einstein’s theory of general relativity with classical dynamics. The clash between these two systems is behind a famous flaw with time travel, known as the grandfather paradox.

Einstein’s theory allows for the possibility of a person using a time loop to travel back in time in order to kill their grandfather. However, classical dynamics dictates that the sequence of events following the grandfather’s death would culminate in the time traveller not existing in the first place.

“As physicists, we want to understand the universe’s most basic, underlying laws and for years I’ve puzzled on how the science of dynamics can square with Einstein’s predictions,” said Germain Tobar, who led the research. “Is time travel mathematically possible?”


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For their calculations, Mr Tobar and Dr Costa used the coronavirus pandemic as a model for working out whether the two theories could co-exist.
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They imagined a time traveller attempting to go back and prevent patient zero from being infected with Covid-19.

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Einstein’s theory allows for the possibility of time travel but the science of dynamics would mean that the fundamental sequence of events could not be interfered with.
This is because if the time traveller succeeded in preventing the virus from spreading, then it would eliminate their initial motivation for them to travel back in time.
“In the coronavirus patient zero example, you might try and stop patient zero from becoming infected, but in doing so you would catch the virus and become patient zero, or someone else would,” Mr Tobar said.
"No matter what you did, the salient events would just recalibrate around you. This would mean that - no matter your actions - the pandemic would occur, giving your younger self the motivation to go back and stop it. Try as you might to create a paradox, the events will always adjust themselves to avoid any inconsistency.
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“The range of mathematical processes we discovered show that time travel with free will is logically possible in our universe without any paradox.”
University of Queensland physicist Dr Fabio Costa, who supervised the research, added: “The maths checks out - and the results are the stuff of science fiction."

A paper detailing the research was published in the journal Classical and Quantum Gravity.


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SongExotic2

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Time travel for travelers? It’s tricky.
Scientific theories suggest it’s possible to travel through time. But the reality isn’t so clear.
PUBLISHED DECEMBER 28, 2020

PHOTO ILLUSTRATION BY MATTHEW PILLSBURY, EDWYNN HOUK GALLERY

I’m stuck at home, you’re stuck at home, we’re all stuck at home. Jetting off to some fun-filled destination like we used to might not be in the cards for a little while yet. But what about travelling through time? And not just the boring way, where we wait for the future to arrive one second at a time. What if you could zip through time at will, travelling forward to the future or backward to the past as easily as pushing buttons on the dashboard of a souped-up DeLorean, just like in the movie Back to the Future?

Time travel has been a fantasy for at least 125 years. H.G. Wells penned his groundbreaking novel, The Time Machine, in 1895, and it’s something that physicists and philosophers have been writing serious papers about for almost a century.

What really kick-started scientific investigations into time travel was the notion, dating to the closing years of the 19th century, that time could be envisioned as a dimension, just like space. We can move easily enough through space, so why not time?...

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SongExotic2

ATM 3 CHAMPION OF THE WORLD. #FREECAIN
First 100
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The latest time travel news is difficult to process. I may need to purchase a phone with more RAM.