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Is "time travel" possible?
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silverpig
Lifer
It's all built into them. They have to compensate for both the gr part of time dilation (they run faster than us because we are deeper in the earth's gravitational field), but also for sr time dilation (they run slower because they are moving faster). The two partially cancel out, but I believe the sr effect is larger.
Gunslinger08
Lifer
You'd have to travel faster than the speed of light to beat the current light waves out to that point.
JulesMaximus
No Lifer
Just ask Dug777.
BrokenVisage
Lifer
YOyoYOhowsDAjello
Moderator<br>A/V & Home Theater<br>Elite member
:thumbsup:
silverpig
Lifer
Probably not. All the time dilation stuff is relativistic, which is a separate branch of physics from quantum. Current quantum physics doesn't really deal with time dilation at all. The only stuff that does at all is particle physics/quantum electrodynamics but that's still really just special relativity tacked onto quantum physics. You can do quantum in a purely "newtonian" regime as well.
Schfifty Five
Lifer
Didn't you know? Google is already Beta testing their Google time travel.
Chiropteran
Diamond Member
Here is how time travel works, explained in a way I hope all of you can "get".
It's the year 2500. You are on earth in your space craft, and you take off. Your space craft accelerates at the rate of 1 lightyear/year per year.
so you travel, with constant acceleration, for 10 years.
Then you switch to reverse thrust to slow down, and constant deceleration for 10 years.
After 20 years you have traveled 100 light years.
Then you turn around and do the exact same thing again, heading back to earth.
Over 40 years you have gone 200 light years... isn't that moving faster than the speed of light?
Well, sort of, not really. You see when you land on earth, it will be the year 2700~, + a bit of time. as if some 200~ years have passed, and it will seem to the people on earth that while you were very close to the speed of light, you did not travel faster than it. While for you, only 40 years have passed- in effect you have traveled some 160 years into the future.
It's the year 2500. You are on earth in your space craft, and you take off. Your space craft accelerates at the rate of 1 lightyear/year per year.
so you travel, with constant acceleration, for 10 years.
Then you switch to reverse thrust to slow down, and constant deceleration for 10 years.
After 20 years you have traveled 100 light years.
Then you turn around and do the exact same thing again, heading back to earth.
Over 40 years you have gone 200 light years... isn't that moving faster than the speed of light?
Well, sort of, not really. You see when you land on earth, it will be the year 2700~, + a bit of time. as if some 200~ years have passed, and it will seem to the people on earth that while you were very close to the speed of light, you did not travel faster than it. While for you, only 40 years have passed- in effect you have traveled some 160 years into the future.
mercanucaribe
Banned
😕 Are you kidding?
DrPizza
Administrator Elite Member Goat Whisperer
Well, one way to "build" a time machine, which is theoretically possible involves
A) travelling really fast for a while
Relative to the earth, your time will pass by slower while you're traveling at speeds very close to c
B) something about a wormhole
Later, you arrive back at the earth; 20 years in your time have gone by, but on earth, 100 years have gone by. However, via the wormhole created, you can grab someone from 100 years into the future and pull them to 20 years into the future (your time)
That's a pretty horrible description of how it's theoretically possible; I didn't pay close attention, because it's not something I'll have to concern myself with, except for the part where: Yes, it's theoretically possible, but no, you can't travel back in time to before your time machine (and wormhole) was created. However, if a wormhole naturally exists... then it may be possible to go back in time to well before now, even though we haven't invented a time machine yet.
I'm sure someone can quote and edit my post to make it a bit more coherent and match theory a little better. Thanks.
DrPizza
Administrator Elite Member Goat Whisperer
I disagree that the amount of knowledge is infinite. It's a huge huge huge amount, but not infinite. There are, after all, a finite number of particles of matter (and photons) in the Universe. Therefore, even if there was knowledge associated with every possible interaction of every possible combination of particles in the universe, that would be
(huge number )^(huge number) which is still finite. Or, if there were a billion pieces of knowledge about every interaction, then
1 billion * (huge number) ^ (huge number)
Of course, such a number is well beyond our comprehension, but it is finite.
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