Thermal production of axino dark matter

Abstract

Abstract:We reconsider thermal production of axinos in the early universe, adding: a) missed terms in the axino interaction; b) production via gluon decays kinematically allowed by thermal masses; c) a precise modeling of reheating. We find an axino abunance a few times larger than previous computations.

Axino cold dark matter revisited

“…Recently, in ref. [6] a new calculation was presented which, although not gauge invariant, includes more terms of the perturbative series, in particular the decay of the gluon whose thermal mass can be larger than the gluino and axino mass taken together. The two latter methods have their own advantages and limitations, and they coincide in the high energy region where the convergence of the perturbation series is stable.…”

“…In ref. [6] a previously neglected dimension-5 term in the Lagrangian, containing purely interactions between supersymmetric particles was also included. This however changes the axino production rate by less than 1%.…”

“…E.g., ref. [6] considers a reheating process from the decay of the inflaton and obtains a slightly smaller abundance of axinos, reduced by a factor of 0.745. In comparing our results we account for this difference.…”

“…[1,2]. The scenario was subsequently extensively studied during the last decade [3][4][5][6][7][8][9][10][11][12][13][14][15][16], with either a neutralino or a stau as the next-to-lightest supersymmetric particle (NLSP). Ways of testing the axino CDM scenario at the LHC were explored in refs.…”

Axino dark matter in moduli-induced baryogenesis

“…More precise computation of the axino production in radiation domination is done by refs. [32][33][34][35][36]. In our later numerical calculation we adopt the result given in ref.…”