TY  - JOUR
AU  - LISA Cosmology Working Group (Bartolo, N. et al
AU  - Figueroa, D. G.
PY  - 2022
DA  - 2022//
TI  - Probing anisotropies of the Stochastic Gravitational Wave Background with LISA
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 009
EP  - 65pp
VL  - 11
PB  - IOP Publishing Ltd
KW  - gravitational wave detectors
KW  - gravitational waves / sources
KW  - gravitational waves / theory
KW  - physics of the early universe
AB  - 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.
SN  - 1475-7516
UR  - https://arxiv.org/abs/2201.08782
UR  - https://doi.org/10.1088/1475-7516/2022/11/009
DO  - 10.1088/1475-7516/2022/11/009
LA  - English
N1  - WOS:000899443700009
ID  - LISACosmologyWorkingGroupBartolo+Figueroa2022
ER  -