Assessing astrophysical foreground subtraction in DECIGO using compact binary populations inferred from the first part of the LIGO-Virgo-KAGRA's fourth observation run

TL;DR

This paper evaluates the ability of DECIGO to detect the primordial gravitational wave background by assessing the subtraction of signals from compact binaries, using population models inferred from recent LIGO-Virgo-KAGRA data.

Contribution

It demonstrates the necessity of the projection scheme for effective binary signal subtraction in DECIGO's frequency band.

Findings

Projection scheme reduces binary signals to detectable levels

DECIGO can potentially detect primordial SGWB after subtraction

Population models inform subtraction feasibility

Abstract

Detecting the stochastic gravitational wave background (SGWB) from our Universe under the inflationary era is one of the primary scientific objectives of DECi-hertz Interferometer Gravitational wave Observatory (DECIGO), a space-borne gravitational wave detector sensitive in the 0.1Hz frequency band. This frequency band is dominated by the gravitational waves from inspiraling compact object binaries. Subtracting these signals is necessary to search for the primordial SGWB. In this paper, we assess the feasibility of the subtraction of such binary signals by employing the population model inferred from the latest gravitational wave event catalogue of the LIGO-Virgo-KAGRA Collaboration. We find that the projection scheme, which was originally proposed by Cutler & Harms (2005), is necessary to reduce the binary signals to the level where DECIGO can detect the primordial background.