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arXiv 1802.09063gr-qc
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无穷导数引力中更一般度量的散焦条件

Conditions for defocusing around more general metrics in Infinite Derivative Gravity

James Edholm

摘要:

无穷导数引力理论通过一个简化的近似,解决了广义相对论中存在的大爆炸曲率奇点。我们表明,它也可以避免霍金-彭罗斯奇点,通过允许散焦的零射线通过Raychaudhuri方程。这不仅发生在我们忽略物质贡献的最小情况下,而且发生在物质起关键作用的情况下。我们调查散焦的一般情况下,这种anomaly适用的条件,也为更具体的度量,包括一个一般的弗里德曼-罗伯逊-沃克(FRW)度量和三个特定的选择的比例因子,产生一个弹跳FRW宇宙。

英文摘要:

Infinite Derivative Gravity is able to resolve the Big Bang curvature singularity present in general relativity by using a simplifying ansatz. We show that it can also avoid the Hawking- Penrose singularity, by allowing defocusing of null rays through the Raychaudhuri equation. This occurs not only in the minimal case where we ignore the matter contribution, but also in the case where matter plays a key role. We investigate the conditions for defocusing for the general case where this ansatz applies and also for more specific metrics, including a general Friedmann-Robertson-Walker (FRW) metric and three specific choices of the scale factor which produce a bouncing FRW universe.

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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