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香港科学家证实时间旅行无法实现

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小编摘要:香港科学家研究得出世上没有什么物质的速度可以超过光速,因此时间旅行是不可能实现的。

导读:10年前,科学家发现,在一些特定介质中的光脉冲可能会快于光速。根据爱因斯坦的理论,快于光速意味着存在时间旅行的可能性。然而,香港科学家近日宣布,他们已经研究证实单个光子的速度极限为光速,不会快于光速,人类憧憬的时间旅行恐怕只是梦一场。

BEIJING, July 26 (Xinhuanet) -- Hong Kong scientists announced that they had determined the idea of time travel is impossible by proving nothing can travel faster than the speed of light.

The finding is contained in a study done by a research team from Hong Kong University of Science and Technology.

The study was published Monday in a scientific journal "Physical Review Letters" in the United States.

"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 on its website.

"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 Professor Du Shengwang, who led the study.

The possibility of time travel was raised 10 years ago when scientists discovered the optical pulses in some specific medium might propagate information in a faster-than-light speed.

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

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2011-07-27 10:40 编辑:claudiaenglish
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