Posted on 09/25/2020 9:15:31 PM PDT by BenLurkin
“Classical dynamics says if you know the state of a system at a particular time, this can tell us the entire history of the system,” said Germain Tobar, a student in the School of Mathematics and Physics at the University of Queensland.
“This has a wide range of applications, from allowing us to send rockets to other planets and modeling how fluids flow.”
“For example, if I know the current position and velocity of an object falling under the force of gravity, I can calculate where it will be at any time.”
“However, Einstein’s theory of general relativity predicts the existence of time loops or time travel — where an event can be both in the past and future of itself — theoretically turning the study of dynamics on its head.”
A unified theory that could reconcile both traditional dynamics and Einstein’s theory of relativity is the holy grail of physics.
“But the current science says both theories cannot both be true,” Tobar said.
“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.”
“I wondered: Is time travel mathematically possible?”
Tobar and his colleague, Dr. Fabio Costa from the Centre for Engineered Quantum Systems in the School of Mathematics and Physics at the University of Queensland, found a way to ‘square the numbers’ and their calculations could have fascinating consequences for science.
(Excerpt) Read more at sci-news.com ...
She remembers things from the past before I was born, about me.
;-)
Duh, explains Hillary returning and returning......
Maybe, maybe not. ;-)
Yeah.... except it isn’t.
So where’s the pair of ducks?
Love, Tim Taylor
In the end, we are all Time Travelers. Some get to travel a little further than others, but on average, we get to travel through about 80 years.
The time travel of science fiction is just that, fiction. And it always will be. Like alternate realities, fun to imagine and ponder, but still just fiction.
bttt
OK, just in these first few lines I know this is nonsense. This guy doesn’t know his physics.
These seem trivial compared to changing the velocity we're moving in time, heheh.
LOL .... you win the Internet today :)
I think whenever you go in time, you must also plot _where_ you will be in that time. Because the earth will not be in the same place. If you go back in time a week, for example, you need to also go back to where the earth was a week ago.
Totally agree. You have to be precise to time AND place when you move forwards and backwards in time. I think long leaps in time will require tremendous amounts of energy due to the distances of, say, the position of the earth now versus it’s position then.
I read a story once where the character went back in time and taught the Romans modern medicine or gave them modern medicine. Something like that. The outcome was the Earth became so overpopulated thousands of years later, that it was like a writhing ball of humans. The aghast time traveller went back to ancient Rome again but this time he left a rifle.
That is quite cool.
There’s still the “Star Trek” problem of altering the timeline.
As a result, equation (13) has produced a scenario in which there are two distinct choices for outputs for two components of the process function which result in the same signalling direction (region 4 to region 1).
It is fairly easy to show that there are actually THREE distinct choices for outputs, not two, and the third one will automatically adapt to counteract either of the first two. So the grandfather paradox still holds, prohibiting time travel.
I can't believe they published this...
“For example, if I know the current position and velocity of an object falling under the force of gravity, I can calculate where it will be at any time.”
But you can’t predict with certainty where it was even 1 second before it began to fall.
Well, you can if you know the position and velocity of every object in a closed system, or even an open system if you know that for all objects in the universe, by working backwards in time in this case. That's the point of classical, deterministic physics.
Imagine your time travel machine is a rocket ship floating in space near the earth. You set it to go 1 minute into the past. Now even if you have a really fast rocket ship, it may take you hours or days to get back to where you were 1 minute before. So your sensors won't be in the right place to figure out whether or not the field goal was made so you can place the right bet on the outcome of the game.
This is precisely what I’ve said for the next 6 months.
This suggests no free will, or a rather constrained free will that somehow is compatible with determinism, as the future is already set in stone.
In a block universe time travel either will be there or it won't. Some being outside the block would be able to see if there were space-time curves that went backward through time.
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