Distinguishing a stochastic gravitational-wave signal from correlated noise with joint parameter estimation: Fisher analysis for ground-based detectors

Understand

Search sensitivity to a stochastic gravitational-wave background (SGWB) is enhanced by cross-correlating detector signals.

• However, one of the most serious concerns is the environmental noise correlated between detectors.
• The global electromagnetic fields on the Earth, known as Schumann resonances, produce the correlated noise through the instrumental magnetic couplings.
• In this paper, we study the detectability of a SGWB in the presence of the correlated magnetic noise, using the Fisher analysis based on the analytical model of the correlated magnetic noise.