2014/06/23 by E. Thrane, Eric Thrane, N. Christensen +5
Physics and Astronomy · #Cosmology and Gravitation Theories #Model Reduction and Neural Networks #Pulsars and Gravitational Waves Research #astro-ph.CO #astro-ph.IM #gr-qc
paper · pdf · doi:10.1103/physrevd.90.023013
16 pages, 8 figures
arxiv created 2014/06/23 · openalex publication_date 2014/07/11 · arxiv updated 2015/06/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
One of the key science goals of advanced gravitational-wave detectors is to observe a stochastic gravitational-wave background. However, recent work demonstrates that correlated magnetic fields from Schumann resonances can produce correlated strain noise over global distances, potentially limiting the sensitivity of stochastic background searches with advanced detectors. In this paper, we estimate the correlated noise budget for the worldwide advanced detector network and conclude that correlated noise may affect upcoming measurements. We investigate the possibility of a Wiener filtering scheme to subtract correlated noise from Advanced LIGO searches, and estimate the required specifications. We also consider the possibility that residual correlated noise remains following subtraction, and we devise an optimal strategy for measuring astronomical parameters in the presence of correlated noise. Using this new formalism, we estimate the loss of sensitivity for a broadband, isotropic stochastic background search using 1 yr of LIGO data at design sensitivity. Given our current noise budget, the uncertainty with which LIGO can estimate energy density will likely increase by a factor of \ensuremath≈12---if it is impossible to achieve significant subtraction. Additionally, narrow band cross-correlation searches may be severely affected at low frequencies f\ensuremath\lesssim70 Hz without effective subtraction.