期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 11, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2022/11/009
关键词
gravitational wave detectors; gravitational waves / sources; gravitational waves / theory; physics of the early universe
资金
- ASI Grant [2016-24-H.0]
- U.S. Department of Energy [DE-SC0010386]
- Swiss National Science Foundation (SNSF) [200020-178787]
- Atraccion de Talento CAM [2019-T1/TIC15784]
- DGF [ORCID 0000-0002-4005-8915]
- UKRI Consolidated Grant [ST/T000791/1]
- Ramon y Cajal [RYC-2017-23493]
- Generalitat Valenciana [PROMETEO/2021/083]
- Ministerio de Ciencia e Innovacion [PID2020-113644GB-I00]
- European Union [DarkGRA-757480, 724659]
- MIUR PRIN programme
- Amaldi Research Center - MIUR program Dipartimento di Eccellenza [CUP: B81I18001170001]
- Istituto Nazionale di Fisica Nucleare (INFN)
- STFC [ST/T000791/1, ST/P000762/1, ST/T000813/1]
- Italian Ministry of Education, University and Research (MIUR) through the Dipartimenti di eccellenza project Science of the Universe
- Science and Technology Facility Council (STFC), United Kingdom [ST/P000258/1]
- US-NSF [PHY-1520292, PHY-1820675]
- Belgian Francqui Foundation through a Francqui Start-up Grant
- U.S. Department of Energy (DOE) [DE-SC0010386] Funding Source: U.S. Department of Energy (DOE)
We investigate the sensitivity of the Laser Interferometer Space Antenna (LISA) to the anisotropies of the Stochastic Gravitational Wave Background (SGWB). By building a Signal-to-Noise estimator and performing a Fisher matrix analysis, we quantify the detectability of different multipoles by LISA. This study provides important information for understanding the origin of the SGWB and discriminating among different superimposed SGWB sources.
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 beta Omega(GW) similar to 2 x 10(-11) is required to observe a dipolar signal with LISA. The detector response to the quadrupole has a factor similar to 10(3) beta 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.
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