Dark Matter freezeout in modified cosmological scenarios

Abstract

We study the effects of modifying the expansions history of the Universe on Dark Matter freezeout. We derived a modified Boltzmann equation for freeze-out for an arbitrary energy density in the early Universe and provide an analytic approach using some approximations. We then look at the required thermally averaged cross sections needed to obtain the correct relic density for the specific case where the energy density consists of radiation plus one extra component which cools faster. We compare our analytic approximation to a numerical solutions. We find that it gives reasonable results for most of the parameter space explored, being at most a factor of order one away from the measured value. We find that if the new contribution to the energy density is comparable to the radiation density, then a much smaller cross section for Dark Matter annihilation is required. This would lead to weak scale Dark Matter being much more difficult to detect and opens up the possibility that much heavier Dark Matter could undergo freezeout without violating perturbative unitarity.

arXiv comment9 pages, 6 figures. In this version, we added some references and fixed some typos

References in corpus (28)

• Particle Dark Matter: Evidence, Candidates and Constraints
• Exploring the Expansion History of the Universe
• Dark Matter Candidates from Particle Physics and Methods of Detection
• The Waning of the WIMP? A Review of Models, Searches, and Constraints
• WIMP dark matter candidates and searches - current status and future prospects
• Quintessence and the Relic Density of Neutralinos
• Einstein and Jordan frames reconciled: a frame-invariant approach to scalar-tensor cosmology
• SUSY Dark Matter and Quintessence
• Dark Matter Relic Abundance and Scalar-Tensor Dark Energy
• Cosmology in the Randall-Sundrum Brane World Scenario
• When the Universe Expands Too Fast: Relentless Dark Matter
• Dark Matter Freeze-in Production in Fast-Expanding Universes
• SUSY constraints from relic density: high sensitivity to pre-BBN expansion rate
• Quintessential Kination and Cold Dark Matter Abundance
• Cosmological constraints on parametrized interacting dark energy
• Scalar singlet dark matter in non-standard cosmologies
• Phenomenology of Self-Interacting Dark Matter in a Matter-Dominated Universe
• Relic density of dark matter in brane world cosmology
• Dark Matter Freeze-out During Matter Domination
• Higgs portal dark matter in non-thermal cosmologies
• Multi-component dark matter from a hidden gauged SU(3)
• Inflaton dark matter from incomplete decay
• Establishing the Dark Matter Relic Density in an Era of Particle Decays
• Constraints on Dark Matter Annihilation Cross Section in Scenarios of Brane-World and Quintessence
• Anomaly mediated SUSY breaking scenarios in the light of cosmology and in the dark (matter)
• Cold dark matter in brane cosmology scenario
• Relic Abundance of Asymmetric Dark Matter in Quintessence
• Abundance of Asymmetric Dark Matter in Brane World Cosmology

Cited by in corpus (14)

• Ultraviolet Freeze-in and Non-Standard Cosmologies
• Primordial Gravitational Wave Signals in Modified Cosmologies
• Reconstructing Non-standard Cosmologies with Dark Matter
• WIMPs during Reheating
• Reviving $Z$ and Higgs Mediated Dark Matter Models in Matter Dominated Freeze-out
• Self-interacting dark matter without prejudice
• TeV Scale Leptogenesis with Dark Matter in Non-standard Cosmology
• A dark clue to seesaw and leptogenesis in a pseudo-Dirac singlet doublet scenario with (non)standard cosmology
• Scalar Multiplet Dark Matter in a Fast Expanding Universe: resurrection of the desert region
• Long lived inert Higgs in fast expanding universe and its imprint on cosmic microwave background
• WIMPy Leptogenesis in Non-Standard Cosmologies
• Resonant probing spin-0 and spin-2 dark matter mediators with fixed target experiments
• Frozen-in fermionic singlet dark matter in non-standard cosmology with a decaying fluid
• WIMP dark matter in bulk viscous non-standard cosmologies