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arXiv 2202.04093gr-qchep-thmath-phmath.APmath.MP
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关于渐近荷、剥离失效与晚期尾之间的关系

On the Relation Between Asymptotic Charges, the Failure of Peeling and Late-time Tails

Dejan Gajic, Lionor M. A. Kehrberger

AI总结:

本文整合近期研究关键思想,引入$f(r)$修正Newman--Penrose荷建立渐近行为关联字典,解释下落质量系统四极近似导致剥离失效及引力辐射晚期尾偏离Price定律的物理机制。

摘要:

过去几年,关于动力学天体物理时空中引力辐射渐近结构的数学研究取得了显著进展。本文提炼了近期研究中的一些关键思想,并以新的方式整合它们,以便更广泛的广义相对论界能够理解。在此过程中,我们还宣布了一些新的物理发现。首先,我们在渐近平直时空中引入守恒的$f(r)$修正Newman--Penrose荷,并表明这些荷提供了一个字典,可关联不同区域无质量一般自旋场的渐近行为:$i^+$附近的渐近行为(“晚期尾”)可从朝向$\boldsymbol{\rm I}^+$的渐近行为中读取,类似地,朝向$\boldsymbol{\rm I}^+$的渐近行为可从$i^-$或$\boldsymbol{\rm I}^-$附近的渐近行为中读取。利用这一字典,我们解释了:(I)来自$i^-$的$N$个下落质量系统的四极近似如何导致“朝向$\boldsymbol{\rm I}^+$的剥离性质”被违反;(II)这种剥离失效导致引力辐射晚期尾行为偏离通常预测:Price定律预言当$u\to\boldsymbol{\rm \bf \text{∞}}$时$rΨ^{[4]}|_{\boldsymbol{\rm I}^+}\boldsymbol{\rm \bf \text{∼}}u^{-6}$,而我们预测$rΨ^{[4]}|_{\boldsymbol{\rm I}^+}\boldsymbol{\rm \bf \text{∼}}u^{-3}$,后者衰减率的系数是无限过去物质分布的单极和四极矩的倍数。

英文摘要:

The last few years have seen considerable mathematical progress concerning the asymptotic structure of gravitational radiation in dynamical, astrophysical spacetimes. In this paper, we distil some of the key ideas from recent works and assemble them in a new way in order to make them more accessible to the wider general relativity community. We also announce some new physical findings in this process. First, we introduce the conserved $f(r)$-modified Newman--Penrose charges on asymptotically flat spacetimes, and we show that these charges provide a dictionary that relates asymptotics of massless, general spin fields in different regions: Asymptotic behaviour near $i^+$ ("late-time tails") can be read off from asymptotic behaviour towards $\mathcal I^+$, and, similarly, asymptotic behaviour towards $\mathcal I^+$ can be read off from asymptotic behaviour near $i^-$ or $\mathcal I^-$. Using this dictionary, we then explain how: (I) the quadrupole approximation for a system of $N$ infalling masses from $i^-$ causes the "peeling property towards $\mathcal I^+$" to be violated, and (II) this failure of peeling results in deviations from the usual predictions for tails in the late-time behaviour of gravitational radiation: Instead of the Price's law rate $rΨ^{[4]}|_{\mathcal I^+}\sim u^{-6}$ as $u\to\infty$, we predict that $rΨ^{[4]}|_{\mathcal I^+}\sim u^{-3}$, with the coefficient of this latter decay rate being a multiple of the monopole and quadrupole moments of the matter distribution in the infinite past.

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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