Impacts of Gravitational-Wave Background from Supermassive Black Hole Binaries on the Detection of Compact Binaries by LISA

TL;DR

This paper examines how the stochastic gravitational-wave background from supermassive black hole binaries affects LISA's ability to detect various compact binaries, emphasizing the need to mitigate this noise for successful observations.

Contribution

It provides an analysis of the impact of SMBHB-generated background noise on LISA's detection capabilities for multiple types of gravitational wave sources.

Findings

SGWB from SMBHBs significantly interferes with LISA's detection of MBHBs, VGBs, and EMRIs.

Resolving and removing this noise is crucial for LISA's mission success.

The study highlights the importance of noise mitigation strategies in gravitational wave astronomy.

Abstract

In the frequency band of Laser Interferometer Space Antenna (LISA), extensive research has been conducted on the impact of foreground confusion noise generated by galactic binaries within the Milky Way galaxy. Additionally, the recent evidence for a stochastic signal, announced by the NANOGrav, EPTA, PPTA, CPTA and InPTA, indicates that the stochastic gravitational-wave background generated by supermassive black hole binaries (SMBHBs) can contribute a strong background noise within in LISA band. Given the presence of such strong noise, it is expected to have a considerable impacts on LISA's scientific missions. In this work, we investigate the impacts of the SGWB generated by SMBHBs on the detection of massive black hole binaries (MBHBs), verified galactic binaries (VGBs) and extreme mass ratio inspirals (EMRIs) in the context of LISA, and find it crucial to resolve and eliminate the exceed noise from the SGWB to ensure the success of LISA's missions.