Time Travel

[cool_b74]

time travel exists. i agree . but i don't think for it to happen you have to travel in the space. i believe there is lot to understand about the inner space that we live around . just think about this NAKED -> CLOTHED WHAT HAPPENS HERE is that you are in one phase then you enter another phase . just like that if u think there is another parallel world operating on this earth then u can understand about the phase change so stargates as in the scifi channel can be understood

[wormholeman]

I dont know if there is a time machine, and I dont know if anyone or, if anthing can travel back or forward in time. They are all just thoughts on how we "think" it would happen.

[wormholeman]

But if you think of it, we are moving forward in time. Interesting! The clocks move ahead.

[wormholeman]

But the problem with that is we get older...lol

[darkkazier]

well as far as your paradox, this might be a good answer for you:

 

http://www.newscientist.com/channel/fundamentals/mg18625044.300

 

THE laws of physics seem to permit time travel' date=' and with it, paradoxical situations such as the possibility that people could go back in time to prevent their own birth. But it turns out that such paradoxes may be ruled out by the weirdness inherent in laws of quantum physics.

 

Some solutions to the equations of Einstein's general theory of relativity lead to situations in which space-time curves back on itself, theoretically allowing travellers to loop back in time and meet younger versions of themselves. Because such time travel sets up paradoxes, many researchers suspect that some physical constraints must make time travel impossible. Now, physicists Daniel Greenberger of the City University of New York and Karl Svozil of the Vienna University of Technology in Austria have shown that the most basic features of quantum theory may ensure that time travellers could never alter the past, even if they are able to go back in time.

 

The constraint arises from a quantum object's ability to behave like a wave. Quantum objects split their existence into multiple component waves, each following a distinct path through space-time. Ultimately, an object is usually most likely to end up in places where its component waves recombine, or "interfere", constructively, with the peaks and troughs of the waves lined up, say. The object is unlikely to be in places where the components interfere destructively, and cancel each other out.

 

Quantum theory allows time travel because nothing prevents the waves from going back in time. When Greenberger and Svozil analysed what happens when these component waves flow into the past, they found that the paradoxes implied by Einstein's equations never arise. Waves that travel back in time interfere destructively, thus preventing anything from happening differently from that which has already taken place (http://www.arxiv.org/quant-ph/0506027). "If you travel into the past quantum mechanically, you would only see those alternatives consistent with the world you left behind you," says Greenberger.

“The most basic features of quantum theory may ensure that time travellers could never alter the past”

 

"This is a very nice idea," says physicist Avshalom Elitzur of the Weizmann Institute in Rehovot, Israel, who also suggests that further work in the area could help to clarify the nature of time itself. "Time is a very mysterious thing."[/quote']

[wormholeman]

Ya, that is interesting.

[darkkazier]

So basically, you can go back in time as an observer, but nothing else, which makes sense.

[danny8522003]

Yea it does. Although this means that the painiting i sent back can never be seen by my past self, otherwise a paradox will be formed.