Search for exotic low-mass fields with a global magnetometer network

The Global Network of Optical Magnetometers for Exotic physics searches (GNOME) is a network of geographically separated, time-synchronized, optically pumped atomic magnetometers searching for correlated transient signals that might herald exotic physics [1]. Quantum sensor networks provide an additional tool in multi-messenger astronomy to probe high-energy astrophysical events for signals predicted by beyond-standard-model (BSM) theories. We present a method to use the GNOME to search for coherent, intense bursts of exotic low-mass fields (ELFs) that could be produced alongside gravitational waves (GWs) [2] and fast radio bursts (FRBs). The two stage analysis uses a model agnostic excess power statistic [3] to first identify network-wide high power events which are then subjected to a generalized likelihood ratio test. We construct Feldman-Cousins confidence belts [4] to constrain detectable ELF signal amplitudes.

[1] S. Afach, D. Budker et al., Physics of the Dark Universe, 22, 162-180 (2018)

[2] Dailey, C., Bradley, C., Jackson Kimball, D.F. et al., Nat Astron 5, 150–158 (2021)

[3] W. G. Anderson, P. R. Brady, et al., Phys. Rev. D 63, 042003 (2001)

[4] G. J. Feldman and R. D. Cousins Phys., Rev. D 57, 3873 (1998)