Review of dark-matter axion experiments

Linear pre-metric electrodynamics and deduction of the light cone

“…Abelian axions coupling to electromagnetism were first considered by Ni [44] and correspond to a non-vanishing piece (3) χ. There have been intensive experimental searches for axions, see [46,66,75] and references therein. To date, no evidence of such a field has been found.…”

“…There have been intensive experimental searches for axions, see [46,66,75] and references therein. Constraints on the axion mass and coupling to the electromagnetic field have been obtained both from astrophysical observations as from laboratory experiments, see [46,66,75] for details. Constraints on the axion mass and coupling to the electromagnetic field have been obtained both from astrophysical observations as from laboratory experiments, see [46,66,75] for details.…”

“…To date, no evidence of such a field has been found. Constraints on the axion mass and coupling to the electromagnetic field have been obtained both from astrophysical observations as from laboratory experiments, see [46,66,75] for details. However, as we will see later, the axion-like term does not enter into important quantities as the energy-momentum current and the Fresnel equation.…”

Brazilian Community Report on Dark Matter

“…It has been argued that if the breaking occurs before or during the inflationary period and not restored afterwards the axion dark matter mass range is 10 −12 eV ≤ m A ≤ 10 −2 eV; and if the final symmetry breaking occurs after the inflationary period there is a lower bound m A ≥ 28(2) µeV [19]. Axions have been searched in many experiments and are also the main target of several experimental proposals [27][28][29][30]. Different theoretical studies in the Brazilian community of high energy physics, astrophysics and cosmology have been dedicated to axions and axion-like particles, which are not related to the strong CP problem but have some similar properties with axions, that are in the scope of the actual and near-future experiments [31][32][33][34][35][36].…”

Tracking the Local Group Dynamics by Extended Gravity

“…In fact, dark matter is one of the most profound unsolved phenomena in modern astrophysics and cosmology. The standard approach describes dark matter as cold massive particles dubbed Weakly Interacting Massive Particles (WIMPs) [21][22][23][24][25][26][27][28][29][30][31], axions [32][33][34][35][36][37][38][39][40] or very light axion-like particles [41][42][43]. The presence of dark matter in galaxies is observed from different measurements.…”