arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2301.08205astro-ph.COgr-qc
收藏

天体物理引力波背景的圆偏振

Circular Polarization of the Astrophysical Gravitational Wave Background

Lorenzo Valbusa Dall'Armi, Atsushi Nishizawa, Angelo Ricciardone, Sabino Matarrese

AI总结:

本文揭示了由未解析源泊松涨落产生的天体物理引力波背景圆偏振可被第三代干涉仪探测,并指出需利用频率和角依赖性清除该噪声以搜寻早期宇宙信号。

摘要:

引力波的圆偏振是检验引力中宇称破坏以及区分随机背景的宇宙学起源或天体物理起源的强大可观测量。这一性质源于均匀且各向同性的天体物理背景预期的非偏振特性,这与某些能够产生偏振背景的特定宇宙学源相反。然而,在这项工作中,我们表明天体物理背景中也存在不可忽略的圆偏振,它由未解析源数量的泊松涨落产生,可被信噪比大于一的第三代干涉仪探测到。我们还解释了在哪些情况下可以利用频率和角依赖性从引力波图中清除这种额外的噪声源,以搜寻来自早期宇宙的信号。未来关于使用地面和空间干涉仪探测偏振宇宙学背景的研究应考虑到这种前景贡献的存在。

英文摘要:

The circular polarization of gravitational waves is a powerful observable to test parity violation in gravity and to distinguish between the primordial or the astrophysical origin of the stochastic background. This property comes from the expected unpolarized nature of the homogeneous and isotropic astrophysical background, contrary to some specific cosmological sources that can produce a polarized background. However, in this work we show that there is a non-negligible amount of circular polarization also in the astrophysical background, generated by Poisson fluctuations in the number of unresolved sources, which can be detected by the third-generation interferometers with signal-to-noise ratio larger than one. We also explain in which cases the gravitational wave maps can be cleaned from this extra source of noise, exploiting the frequency and the angular dependence, in order to search for signals from the early Universe. Future studies about the detection of polarized cosmological backgrounds with ground- and space-based interferometers should account for the presence of such a foreground contribution.

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。

↑