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arXiv 1405.0904hep-thgr-qc
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提升时空几何的黎曼曲率

Riemann curvature of a boosted spacetime geometry

Emmanuele Battista, Giampiero Esposito, Paolo Scudellaro, Francesco Tramontano

摘要:

超相对论性的Boosting过程在文献中被用来将Schwarzschild-de Sitter时空的度规映射成一个描述de Sitter时空的度规加上一个位于零超曲面上的激波奇点。本文通过数值计算,计算了增强的Schwarzschild-de Sitter度规的黎曼曲率张量,使增强速度逐渐接近光速,达到超相对论性。因此,第一次在文献中,通过狄拉克的δ分布及其衍生物的曲率奇异极限数值计算这类时空。最后,对Kretschmann不变量和测地线方程的分析表明,时空在一个三维球中具有一个标量曲率奇点,并且有可能定义我们在这里所说的提升视界,一种所有粒子都被惊人地推开的弹性壁,正如数值分析所证明的那样。这似乎表明,推升几何受一种反引力效应支配,因为所有测地线似乎都拒绝进入推升视界,即使它们的初始条件旨在将粒子推向推升视界。

英文摘要:

The ultrarelativistic boosting procedure had been applied in the literature to map the metric of Schwarzschild-de Sitter spacetime into a metric describing de Sitter spacetime plus a shock-wave singularity located on a null hypersurface. This paper evaluates the Riemann curvature tensor of the boosted Schwarzschild-de Sitter metric by means of numerical calculations, which make it possible to reach the ultrarelativistic regime gradually by letting the boost velocity approach the speed of light. Thus, for the first time in the literature, the singular limit of curvature through Dirac's delta distribution and its derivatives is numerically evaluated for this class of spacetimes. Eventually, the analysis of the Kretschmann invariant and the geodesic equation show that the spacetime possesses a scalar curvature singularity within a 3-sphere and it is possible to define what we here call boosted horizon, a sort of elastic wall where all particles are surprisingly pushed away, as numerical analysis demonstrates. This seems to suggest that boosted geometries are ruled by a sort of antigravity effect since all geodesics seem to refuse to enter the boosted horizon, even though their initial conditions are aimed at driving the particles towards the boosted horizon.

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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