2026-04-18T03:14:23Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1191242025-12-05T16:44:29Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Espriu, D. (Domènec) author Renau Cerrillo, Albert author 2018-01-18T14:26:54Z 2018-01-18T14:26:54Z 2015-06 2018-01-18T14:26:54Z In this work we analyze the propagation of photons in an environment where a strong magnetic field (perpendicular to the photon momenta) coexists with an oscillating cold axion background with the characteristics expected from dark matter in the galactic halo. Qualitatively, the main effect of the combined background is to produce a three-way mixing among the two photon polarizations and the axion. It is interesting to note that in spite of the extremely weak interaction of photons with the cold axion background, its effects compete with those coming from the magnetic field in some regions of the parameter space. We determine (with one plausible simplification) the proper frequencies and eigenvectors as well as the corresponding photon ellipticity and induced rotation of the polarization plane that depend both on the magnetic field and the local density of axions. We also comment on the possibility that some of the predicted effects could be measured in optical table-top experiments. Camps magnètics (Física còsmica) Fotons Cosmic magnetic fields Photons Photons in a cold axion background and strong magnetic fields: Polarimetric consequences