TY - JOUR
T1 - Probing anisotropies of the Stochastic Gravitational Wave Background with LISA
AU - Bartolo, Nicola
AU - Bertacca, Daniele
AU - Caldwell, Robert
AU - Contaldi, Carlo R
AU - Cusin, Giulia
AU - De Luca, Valerio
AU - Dimastrogiovanni, Emanuela
AU - Fasiello, Matteo
AU - Figueroa, Daniel G
AU - Franciolini, Gabriele
AU - Jenkins, Alexander C
AU - Peloso, Marco
AU - Pieroni, Mauro
AU - Renzini, Arianna
AU - Ricciardone, Angelo
AU - Riotto, Antonio
AU - Sakellariadou, Mairi
AU - Sorbo, Lorenzo
AU - Tasinato, Gianmassimo
AU - Torrado, Jesús
AU - Clesse, Sebastien
AU - Kuroyanagi, Sachiko
N1 - Publisher Copyright:
© 2022 IOP Publishing Ltd and Sissa Medialab.
PY - 2022/11/1
Y1 - 2022/11/1
N2 - 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.
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 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.
KW - gravitational wave detectors
KW - gravitational waves / sources
KW - gravitational waves / theory
KW - physics of the early universe
UR - http://www.scopus.com/inward/record.url?scp=85142007168&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2022/11/009
DO - 10.1088/1475-7516/2022/11/009
M3 - Article
AN - SCOPUS:85142007168
SN - 1475-7516
VL - 2022
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
IS - 11
M1 - 009
ER -