|
Résumé |
Axion-like particles (ALPs), the pseudo-Goldstone bosons arising from the
spontaneous breaking of global symmetry, are promising contenders for dark matter.
The most extensively studied ALP production mechanism is known as misalignment
mechanism, where ALP is presumed to initially remain frozen at a point in the
field space until it begins oscillating around the potential minimum and behaves
as cold dark matter (CDM). The oscillation initiates once the universe Hubble
expansion rate falls below the ALP mass, defining the oscillation frequency. In
this work, we examine how electroweak symmetry breaking (EWSB) affects ALP
evolution, specifically through a higher order Higgs portal interaction. The
interaction is observed to contribute partially to the ALP's mass during EWSB,
thus altering oscillation frequencies and influencing the correlation between the
scale of symmetry breaking and its mass. The novelty of this study lies in
broadening the parameter space satisfying correct CDM relic density, facilitating
future exploration through a diverse range of experimental avenues. |
