The power spectrum of luminosity distance fluctuations in General Relativity

IF 5.3 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-12 DOI:10.1088/1475-7516/2024/11/021
Mattia Pantiri, Matteo Foglieni, Enea Di Dio and Emanuele Castorina
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Abstract

At low redshift, it is possible to combine spectroscopic information of galaxies with their luminosity or angular diameter distance to directly measure the projection of peculiar velocities (PV) along the line-of-sight. A PV survey probing a large fraction of the sky is subject to so-called wide-angle effects, arising from the variation of the line-of-sight across the sky, and other sub-leading projection effects due to the propagation of the photons in a perturbed cosmological background. In this work, for the first time, we provide a complete description, within linear theory and General Relativity, of the power spectrum of luminosity distance fluctuations, clarifying its relation to the observables in a PV survey. We find that wide-angle effects will be detected at high significance by future observations and will have to be included in the cosmological analysis. Other relativistic projections effects could also be detected provided accurate, per object, distances are available.
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广义相对论中光度距离波动的功率谱
在低红移时,可以将星系的光谱信息与其光度或角径距离结合起来,直接测量沿视线的奇特速度(PV)投影。探测大部分天空的奇特速度测量会受到所谓的广角效应的影响,广角效应是由整个天空的视线变化引起的,而其他次导投影效应则是由光子在扰动宇宙背景中的传播引起的。在这项工作中,我们首次在线性理论和广义相对论的范围内,对光度距离波动的功率谱进行了完整描述,阐明了它与光电巡天观测中的观测数据之间的关系。我们发现,广角效应将在未来的观测中被探测到,并将被纳入宇宙学分析。如果能得到每个天体的精确距离,还可以探测到其他相对论投影效应。
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来源期刊
Journal of Cosmology and Astroparticle Physics
Journal of Cosmology and Astroparticle Physics 地学天文-天文与天体物理
CiteScore
10.20
自引率
23.40%
发文量
632
审稿时长
1 months
期刊介绍: Journal of Cosmology and Astroparticle Physics (JCAP) encompasses theoretical, observational and experimental areas as well as computation and simulation. The journal covers the latest developments in the theory of all fundamental interactions and their cosmological implications (e.g. M-theory and cosmology, brane cosmology). JCAP''s coverage also includes topics such as formation, dynamics and clustering of galaxies, pre-galactic star formation, x-ray astronomy, radio astronomy, gravitational lensing, active galactic nuclei, intergalactic and interstellar matter.
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