Relic Density of Axion Dark Matter in Standard and Non-Standard Cosmological Scenarios

Abstract

In this master's thesis we study the production of axion dark matter through the so-called misalignment mechanism by considering that during that time, the universe was dominated by a new kind of fluid, different than radiation. We perform a very detailed analysis of the oscillation temperature and the relic density today, both analytically and numerically. Our findings show that on the one hand, the oscillation temperature is strongly influenced by the non-standard cosmology, affecting the relic density, and on the other hand, the energy density of the axion gets diluted, because the new fluid eventually decays, injecting entropy into the thermal bath. We find the predicted parameter space of axion dark matter for different non-standard cosmologies and we show its impact on the coupling of axions to two photons.

arXiv admin note: text overlap with arXiv:1506.02601, arXiv:1111.5281 by other authors

References in corpus (7)

• Results from a search for dark matter in the complete LUX exposure
• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Primordial Black Holes as Dark Matter
• Probing the Early Universe with Axion Physics and Gravitational Waves
• Axion constraints in non-standard thermal histories
• Imprints of the Early Universe on Axion Dark Matter Substructure
• Spontaneous CP violation and the strong CP problem

Cited by in corpus (1)

• Axion Dark Matter in the Time of Primordial Black Holes