Probing anisotropies of the Stochastic Gravitational Wave Background with LISA
Probing anisotropies of the Stochastic Gravitational Wave Background with LISA
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DOI：
10.1088/1475-7516/2022/11/009
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发表时间：
2022-01
影响因子：
6.4
通讯作者：
N. Bartolo;D. Bertacca;R. Caldwell;C. Contaldi;G. Cusin;V. De Luca;E. Dimastrogiovanni;M. Fasiello;Daniel G. Figueroa;G. Franciolini;A. Jenkins;M. Peloso;M. Pieroni;A. Renzini;A. Ricciardone;A. Riotto;M. Sakellariadou;L. Sorbo;G. Tasinato;J. Torrado;S. Clesse;S. Kuroyanagi
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文献类型：
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作者：
N. Bartolo;D. Bertacca;R. Caldwell;C. Contaldi;G. Cusin;V. De Luca;E. Dimastrogiovanni;M. Fasiello;Daniel G. Figueroa;G. Franciolini;A. Jenkins;M. Peloso;M. Pieroni;A. Renzini;A. Ricciardone;A. Riotto;M. Sakellariadou;L. Sorbo;G. Tasinato;J. Torrado;S. Clesse;S. Kuroyanagi
本文研究了激光干涉空间天线（丽莎）对随机引力波背景（SGWB）各向异性的敏感性。我们首先讨论了主要的天体物理学和宇宙学来源的SGWB的特点是各向异性的GW能量密度，我们建立了一个信噪比估计量化的灵敏度丽莎不同的多极。然后，我们进行了Fisher矩阵分析的各向异性功能的可检测性与丽莎的个别多极的前景，专注于一个SGWB与幂律频率分布。我们计算的噪声角谱考虑到特定的扫描策略的丽莎检测器。我们分析的情况下产生的运动偶极子和四极多普勒提升各向同性SGWB。我们发现用丽莎观察偶极信号需要β ΩGW = 2 × 10-11。探测器对四极的响应相对于偶极的响应有一个因子Δ 103 β。的各向异性的表征，无论是从理论的角度来看，从地图制作的角度来看，使我们能够提取信息，可以用来理解的SGWB的起源，并区分不同的叠加SGWB源。
We investigate the sensitivity of the Laser Interferometer Space Antenna (LISA) to the anisotropies of the Stochastic Gravitational Wave Background (SGWB). We first discuss the main astrophysical and cosmological sources of SGWB which are characterized by anisotropies in the GW energy density, and we build a Signal-to-Noise estimator to quantify the sensitivity of LISA to different multipoles. We then perform a Fisher matrix analysis of the prospects of detectability of anisotropic features with LISA for individual multipoles, focusing on a SGWB with a power-law frequency profile. We compute the noise angular spectrum taking into account the specific scan strategy of the LISA detector. We analyze the case of the kinematic dipole and quadrupole generated by Doppler boosting an isotropic SGWB. We find that β ΩGW ∼ 2 × 10-11 is required to observe a dipolar signal with LISA. The detector response to the quadrupole has a factor ∼ 103 β relative to that of the dipole. The characterization of the anisotropies, both from a theoretical perspective and from a map-making point of view, allows us to extract information that can be used to understand the origin of the SGWB, and to discriminate among distinct superimposed SGWB sources.