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arXiv 2306.04069gr-qcastro-ph.COhep-th
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具有额外维度的空间中沿膜的超光速传播

Superluminal propagation along the brane in space with extra dimensions

De-Chang Dai, Dejan Stojkovic

AI总结:

本文证明 Csaki 等人的额外维度模型允许信号经体空间传播后比沿膜传播的光更快到达,从而在膜上观察者看来实现超光速,并用 GW170104 引力波事件对该模型施加了强限制。

摘要:

我们证明,Csaki 等人(Phys Rev D 62, 045015)提出的具有额外维度的模型允许无质量信号表现出表观超光速传播,该模型在膜上忠实地再现了 Friedmann-Robertson-Walker(FRW)方程。也就是说,大质量膜使时空弯曲,并以这样一种方式影响信号的轨迹:从膜发出、穿过体空间的信号在返回后到达膜上远处一点的速度,比光沿膜传播的速度更快。特别是,由于膜上物质的存在,沿膜发送的信号比体空间信号遭受更大的引力时间延迟。虽然体空间信号在其自身局域中从未以大于光速的速度运动,但从膜上观察者的视角来看,这一效应仍然使人们能够以比光更快的速度发送信号。例如,这一效应可能被用来解决宇宙学视界问题。此外,一个引人注目的观测特征将是同一个引力波信号在两个不同时间到达,其中第一个信号先于其电磁对应物到达。我们利用 GW170104 引力波事件对所讨论的具有额外维度的模型施加了强有力的限制。

英文摘要:

We demonstrate that a model with extra dimensions formulated in Csaki et al. (Phys Rev D 62, 045015), which fatefully reproduces Friedmann-Robertson-Walker (FRW) equations on the brane, allows for an apparent superluminal propagation of massless signals. Namely, a massive brane curves the spacetime and affects the trajectory of a signal in a way that allows a signal sent from the brane through the bulk to arrive (upon returning) to a distant point on the brane faster than the light can propagate along the brane. In particular, the signal sent along the brane suffers a greater gravitational time delay than the bulk signal due to the presence of matter on the brane. While the bulk signal never moves with the speed greater than the speed of light in its own locality, this effect still enables one to send signals faster than light from the brane observer's perspective. For example, this effect might be used to resolve the cosmological horizon problem. In addition, one of the striking observational signatures would be arrival of the same gravitational wave signal at two different times, where the first signals arrives before its electromagnetic counterpart. We used GW170104 gravitational wave event to impose a strong limit on the model with extra dimensions in question.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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