[新闻] 时间旅行再次被证明无法实现。

以下引自El Reg， 原文链接在此
In essence, Professor Du’s team has accomplished two observations. The first was an observation of what’s referred to as the “optical precursor” of the photon, separately from the photon itself; the second was the speed at which both the precursor and the photon can travel.
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Professor Du’s experiment says “no”. In their experiment, according to Physorg, the researchers generated a pair of photons, and passed one of the pair through a group of laser-cooled rubidium atoms, taking advantage of an effect called electromagnetically induced transparency.
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“By showing that single photons cannot travel faster than the speed of light, our results bring to a closure the debate on the true speed of information carried by a single photon,” Physorg quotes Professor Du as saying. “Our findings will also likely have potential applications by giving scientists a better picture on the transmission of quantum information.”

引用第2楼hing_fun于2011-07-26 12:47发表的“”:
理論上返回未時間還是有很多的
例如蟲洞

引用第6楼cym104于2011-07-26 12:50发表的“”:

即使真的存在这种东西，它附近的引力风暴也够你喝一壶的。