Cosmic Variance in Anisotropy Searches at Pulsar Timing Arrays

[2508.21131] Cosmic Variance in Anisotropy Searches at Pulsar Timing Arrays Skip to main content We gratefully acknowledge support from the Simons Foundation, member institutions , and all contributors.
However, contrary to gravitational wave detectors at higher frequencies, PTAs only take a few independent measurements of a GWB and consequently are highly sensitive to cosmic variance, which induces apparent anisotropies in individual realizations of an isotropic GWB.
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