Derives analytic relic yields for dark matter production in general reheating scenarios parametrized by equation-of-state ω, cooling index α, interaction scale Λ and temperature power n, organized by two critical temperature exponents.
Bernal et al.,Ultraviolet Freeze-in and Non-Standard Cosmologies,JCAP11(2019) 026 [1909.07992]
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Electroweak SU(2)_L doublet fermion dark matter with mass above 10^10 GeV (or 300 GeV if pseudo-Dirac) is produced by Boltzmann-suppressed freeze-in above the reheat temperature and evades direct detection while never thermalizing.
Ultrarelativistically decoupling dark matter in Z' portal models has direct detection cross sections that existing experiments like LZ and XENONnT have already excluded over large regions, leaving testable space above the neutrino fog for 0.4 GeV to 1 TeV masses.
Collider experiments can strongly constrain p-wave-suppressed derivative operators and thereby limit reheating temperature, DM mass, and interaction scale needed to match observed DM abundance during reheating.
Non-standard reheating imprints detectable features on SIGW spectra via non-Gaussianity, with dynamics that can suppress or boost the signal amplitude for LISA.
Variations in pre-nucleosynthesis cosmology produce distinct seasons in the phase-space distribution of freeze-in dark matter, directly affecting its warmness and mass bounds.
Review surveying limits and prospects for flavor-violating decays of light axion-like particles, highlighting complementarity of lab, astro, and cosmo probes up to 10^12 GeV scales.
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Flavor phenomenology of light dark particles
Review surveying limits and prospects for flavor-violating decays of light axion-like particles, highlighting complementarity of lab, astro, and cosmo probes up to 10^12 GeV scales.