Observing Kinematic Anisotropies of the Stochastic Background with LISA
arxiv(2024)
摘要
We propose a diagnostic tool for future analyses of stochastic gravitational
wave background signals of extra-galactic origin in LISA data. Next-generation
gravitational wave detectors hold the capability to track unresolved
gravitational waves bundled into a stochastic background. This composite
background contains cosmological and astrophysical contributions, the
exploration of which offers promising avenues for groundbreaking new insights
into very early universe cosmology as well as late-time structure formation. In
this article, we develop a full end-to-end pipeline for the extraction of
extra-galactic signals, based on kinematic anisotropies arising from the
galactic motion, via full-time-domain simulations of LISA's response to the
gravitational wave anisotropic sky. Employing a Markov-Chain-Monte-Carlo
map-making scheme, multipoles up to ℓ=2 are recovered for scale-free
spectra that support an interpretation as signals originating from cosmic
strings in the case of a high signal-to-noise ratio. We demonstrate that our
analysis is consistently beating cosmic variance and is robust against
statistical and systematic errors. The impact of instrumental noise on the
extraction of kinematic anisotropies is investigated, and we establish a
detection threshold of Ω_GW≳ 5× 10^-8 in the presence of
instrument-induced noise. Potential avenues for improvement in our methodology
are highlighted.
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