Searching for axion-like time-dependent cosmic birefringence with data from SPT-3G
arXiv:2203.16567 · doi:10.1103/PhysRevD.106.042011
Abstract
Ultralight axionlike particles (ALPs) are compelling dark matter candidates because of their potential to resolve small-scale discrepancies between CDM predictions and cosmological observations. Axion-photon coupling induces a polarization rotation in linearly polarized photons traveling through an ALP field; thus, as the local ALP dark matter field oscillates in time, distant static polarized sources will appear to oscillate with a frequency proportional to the ALP mass. We use observations of the cosmic microwave background from SPT-3G, the current receiver on the South Pole Telescope, to set upper limits on the value of the axion-photon coupling constant over the approximate mass range eV, corresponding to oscillation periods from 12 hours to 100 days. For periods between 1 and 100 days (), where the limit is approximately constant, we set a median 95% C.L. upper limit on the amplitude of on-sky polarization rotation of 0.071 deg. Assuming that dark matter comprises a single ALP species with a local dark matter density of , this corresponds to . These new limits represent an improvement over the previous strongest limits set using the same effect by a factor of ~3.8.
arXiv comment16 pages, 5 figures. Accepted for publication in Physical Review D
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