A map of the non-thermal WIMP

Abstract

We study the effect of the elastic scattering on the non-thermal WIMP, which is produced by direct decay of heavy particles at the end of reheating. The non-thermal WIMP becomes important when the reheating temperature is well below the freeze-out temperature. Usually, two limiting cases have been considered. One is that the produced high energetic dark matter particles are quickly thermalized due to the elastic scattering with background radiations. The corresponding relic abundance is determined by the thermally averaged annihilation cross-section at the reheating temperature. The other one is that the initial abundance is too small for the dark matter to annihilate so that the final relic is determined by the initial amount itself. We study the regions between these two limits, and show that the relic density depends not only on the annihilation rate, but also on the elastic scattering rate. Especially, the relic abundance of the p-wave annihilating dark matter crucially relies on the elastic scattering rate because the annihilation cross-section is sensitive to the dark matter velocity. We categorize the parameter space into several regions where each region has distinctive mechanism for determining the relic abundance of the dark matter at the present Universe. The consequence on the (in)direct detection is also studied.

arXiv comment9 pages, 5 figures; v2: discussion improved, matches version published in PLB

References in corpus (23)

• Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data
• Dark Matter Results from First 98.7-day Data of PandaX-II Experiment
• Dark matter production in the early Universe: beyond the thermal WIMP paradigm
• Damping scales of neutralino cold dark matter
• The Small-Scale Power Spectrum of Cold Dark Matter
• DAMA/LIBRA and leptonically interacting Dark Matter
• Effects of cold dark matter decoupling and pair annihilation on cosmological perturbations
• Constraining Dark Matter candidates from structure formation
• Elastically Decoupling Dark Matter
• A Non-thermal WIMP Miracle
• Reheating Effects in the Matter Power Spectrum and Implications for Substructure
• Dark Matter Production in Late Time Reheating
• Non-Thermal Dark Matter Mimicking An Additional Neutrino Species In The Early Universe
• Thermalization after inflation and production of massive stable particles
• Non-thermal Histories and Implications for Structure Formation
• The Dark Matter Annihilation Boost from Low-Temperature Reheating
• Neutralino dark matter from heavy axino decay
• Neutralino Warm Dark Matter
• Accurate estimate of the relic density and the kinetic decoupling in non-thermal dark matter models
• Dark Matter Production Mechanisms with a Non-Thermal Cosmological History - A Classification
• Kinetic decoupling of WIMPs: analytic expressions
• WIMP isocurvature perturbation and small scale structure
• A solution to the baryon-DM coincidence problem in the CMSSM with a 126-GeV Higgs boson

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• Non-thermal WIMP baryogenesis
• Testing hilltop supernatural inflation with gravitational waves