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krystabegnalie · 26/07/2011 01:38 AM

Quote:Hong Kong physicists say they have proved that a single photon obeys Einstein's theory that nothing can travel faster than the speed of light -- demonstrating that outside science fiction, time travel is impossible.

The Hong Kong University of Science and Technology research team led by Du Shengwang said they had proved that a single photon, or unit of light, "obeys the traffic law of the universe."

"Einstein claimed that the speed of light was the traffic law of the universe or in simple language, nothing can travel faster than light," the university said on its website.

"Professor Du's study demonstrates that a single photon, the fundamental quanta of light, also obeys the traffic law of the universe just like classical EM (electromagnetic) waves."

The possibility of time travel was raised 10 years ago when scientists discovered superluminal -- or faster-than-light -- propagation of optical pulses in some specific medium, the team said.

It was later found to be a visual effect, but researchers thought it might still be possible for a single photon to exceed light speed.

Du, however, believed Einstein was right and determined to end the debate by measuring the ultimate speed of a single photon, which had not been done before.

"The study, which showed that single photons also obey the speed limit c, confirms Einstein's causality; that is, an effect cannot occur before its cause," the university said.

"By showing that single photons cannot travel faster than the speed of light, our results bring a closure to the debate on the true speed of information carried by a single photon," said Du, assistant professor of physics.

"Our findings will also likely have potential applications by giving scientists a better picture on the transmission of quantum information."

The team's study was published in the U.S. peer-reviewed scientific journal Physical Review Letters.

source:

http://news.discovery.com/space/time-tra...10724.html

hmm still i like time travelling theories, hehehe

I ♥ GUCCI · 26/07/2011 01:43 AM

http://www.engadget.com/2011/07/25/scien...moves-a-l/
Check this one out too!

Slushba132 · 26/07/2011 02:11 AM

in terms of traversing the universe universe wide conquering universal communication doesn't that spoon just kind of suck?

krystabegnalie · 26/07/2011 02:16 AM

(26/07/2011 01:43 AM)I ♥ GUCCI Wrote: http://www.engadget.com/2011/07/25/scien...moves-a-l/
Check this one out too!

well it still link to discoverynews site stating time travel still impossible, lol

St0rMaGe · 26/07/2011 02:22 AM

it's possible using a worm hole.

I ♥ GUCCI · 26/07/2011 02:48 AM

(26/07/2011 02:22 AM)St0rMaGe Wrote: it's possible using a worm hole.

LOL:)

diego · 26/07/2011 03:20 AM

I thought you only needed to get up to 88mph.

elac · 26/07/2011 03:55 AM

This doesn't rule out going backwards in time.
It only supports that "an effect cannot occur before its cause".
Wee could still change the future (or the present) by sending a "cause" back in time and wait for the effects.
Anyways the future would seem pretty empty if you were the only thing sent there, and any changes you made the rest of time would have to catch up to see.
But playing around in the past, that you think wee would have more interest in.
Wee could fix some BIG mistakes mankind has made and set the course for the future.
And if it don't work just go back and change it. Hoho

I ♥ GUCCI · 26/07/2011 05:05 AM

(26/07/2011 03:20 AM)diego Wrote: I thought you only needed to get up to 88mph.

Dude, any car can do that:)

Vegetano1 · 26/07/2011 06:13 AM

"Space/the universe" is faster then light,..

i did the 88mph thingy,. didn't work,. but my name aint marty either,.

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