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arXiv 1606.04894gr-qchep-th
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宇宙记忆效应

The Cosmological Memory Effect

Alexander Tolish, Robert M. Wald

摘要:

“记忆效应”是由于引力辐射的通过而导致的试验粒子相对分离的永久性变化。我们调查的记忆效应,一般的,空间平坦FLRW宇宙学考虑与涉及粒子源的发射事件的辐射。我们发现,如果所产生的扰动分解成标量,矢量和张量部分,只有张量部分有助于记忆。此外,张量对记忆的贡献只取决于源和观测事件的宇宙学标度因子,而不取决于宇宙详细的膨胀历史。特别是,在相同的光度距离的源,在一个空间平坦FLRW时空的记忆效应是增强了闵可夫斯基的情况下的一个因素的$(1 + z)$。

英文摘要:

The "memory effect" is the permanent change in the relative separation of test particles resulting from the passage of gravitational radiation. We investigate the memory effect for a general, spatially flat FLRW cosmology by considering the radiation associated with emission events involving particle-like sources. We find that if the resulting perturbation is decomposed into scalar, vector, and tensor parts, only the tensor part contributes to memory. Furthermore, the tensor contribution to memory depends only on the cosmological scale factor at the source and observation events, not on the detailed expansion history of the universe. In particular, for sources at the same luminosity distance, the memory effect in a spatially flat FLRW spacetime is enhanced over the Minkowski case by a factor of $(1 + z)$.

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