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Article Dans Une Revue JCAP Année : 2023

Stochastic gravitational wave background from stellar origin binary black holes in LISA

Stanislav Babak
Chiara Caprini
  • Fonction : Auteur
Daniel G Figueroa
  • Fonction : Auteur
Nikolaos Karnesis
  • Fonction : Auteur
Paolo Marcoccia
  • Fonction : Auteur
Germano Nardini
  • Fonction : Auteur
Mauro Pieroni
  • Fonction : Auteur
Angelo Ricciardone
  • Fonction : Auteur
Alberto Sesana
  • Fonction : Auteur
Jesús Torrado
  • Fonction : Auteur

Résumé

We use the latest constraints on the population of stellar origin binary black holes (SOBBH) from LIGO/Virgo/KAGRA (LVK) observations, to estimate the stochastic gravitational wave background (SGWB) they generate in the frequency band of LISA. We account for the faint and distant binaries, which contribute the most to the SGWB, by extending the merger rate at high redshift assuming it tracks the star formation rate. We adopt different methods to compute the SGWB signal: an analytical evaluation, Monte Carlo sums over SOBBH population realisations, and a method that accounts for the role of the detector by simulating LISA data and iteratively removing resolvable signals until only the confusion noise is left, allowing for the extraction of both the expected SGWB and the number of resolvable SOBBHs. Since the latter are few for SNR thresholds larger than five, we confirm that the spectral shape of the SGWB in the LISA band follows the analytical prediction of a power law. We infer the probability distribution of the SGWB amplitude from the LVK GWTC-3 posterior of the binary population model; its interquartile range of $h^2\Omega_\mathrm{GW}(f=3\times10^{-3}\,\mathrm{Hz}) \in [5.65,\,11.5]\times10^{-13}$ is in agreement with most previous estimates. We perform a MC analysis to assess LISA's capability to detect and characterise this signal. Accounting for both the instrumental noise and the galactic binaries foreground, with four years of data, LISA will be able to detect the SOBBH SGWB with percent accuracy, narrowing down the uncertainty on the amplitude by one order of magnitude with respect to the range of possible amplitudes inferred from the population model. A measurement of this signal by LISA will help to break the degeneracy among some of the population parameters, and provide interesting constraints, in particular on the redshift evolution of the SOBBH merger rate.

Dates et versions

hal-04083819 , version 1 (27-04-2023)

Identifiants

Citer

Stanislav Babak, Chiara Caprini, Daniel G Figueroa, Nikolaos Karnesis, Paolo Marcoccia, et al.. Stochastic gravitational wave background from stellar origin binary black holes in LISA. JCAP, 2023, 08, pp.034. ⟨10.1088/1475-7516/2023/08/034⟩. ⟨hal-04083819⟩
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