Quintessential Kination and Thermal Production of Gravitinos and Axinos

Abstract

The impact of a kination-dominated phase generated by a quintessential exponential model on the thermal abundance of gravitinos and axinos is investigated. We find that their abundances become proportional to the transition temperature from the kination to the radiation era; since this temperature is significantly lower than the initial ("reheating") temperature, the abundances decrease with respect to their values in the standard cosmology. For values of the quintessential energy-density parameter close to its upper bound, at the eve of nucleosynthesis, we find the following: (i) for unstable gravitinos, the gravitino constraint is totally evaded; (ii) If the gravitino is stable, its thermal abundance is not sufficient to account for the cold dark matter of the universe; (iii) the thermal abundance of axinos can satisfy the cold dark matter constraint for values of the initial temperature well above those required in the standard cosmology. A novel calculation of the axino production rate by scatterings at low temperature is also presented.

Published Version

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Cited by in corpus (10)

• Dark matter production in the early Universe: beyond the thermal WIMP paradigm
• Palatini $R^2$ Quintessential Inflation
• Big Bang nucleosynthesis with a stiff fluid
• Upper Limits on the Peccei-Quinn Scale and on the Reheating Temperature in Axino Dark Matter Scenarios
• Dilaton dominance in the early Universe dilutes Dark Matter relic abundances
• Observable Gravitational Waves from Hyperkination in Palatini Gravity and Beyond
• Observable Primordial Gravitational Waves from Non-minimally Coupled $R^2$ Palatini Modified Gravity
• How an era of kination impacts substructure and the dark matter annihilation rate
• Constraining the quintessential $\alpha$-attractor inflation through dynamical horizon exit method
• Quintessential Kination and Thermal Production of SUSY e-WIMPs