Largest temperature of the radiation era and its cosmological implications

Abstract

The thermal history of the universe before the epoch of nucleosynthesis is unknown. The maximum temperature in the radiation-dominated era, which we will refer to as the reheat temperature, may have been as low as 0.7 MeV. In this paper we show that a low reheat temperature has important implications for many topics in cosmology. We show that weakly interacting massive particles (WIMPs) may be produced even if the reheat temperature is much smaller than the freeze-out temperature of the WIMP, and that the dependence of the present abundance on the mass and the annihilation cross section of the WIMP differs drastically from familiar results. We revisit predictions of the relic abundance and resulting model constraints of supersymmetric dark matter, axions, massive neutrinos, and other dark matter candidates, nucleosynthesis constraints on decaying particles, and leptogenesis by decay of superheavy particles. We find that the allowed parameter space of supersymmetric models is altered, removing the usual bounds on the mass spectrum; the cosmological bound on massive neutrinos is drastically changed, ruling out Dirac (Majorana) neutrino masses $m_{\nu }$ only in the range 33 keV $\simlt m_ν\simlt$ 6 (5) MeV, which is significantly smaller from the the standard disallowed range 94 eV $\simlt m_ν\simlt$ 2 GeV (this implies that massive neutrinos may still play the role of either warm or cold dark matter); the cosmological upper bound on the Peccei-Quinn scale may be significantly increased to $10^{16}$GeV from the usually cited limit of about $10^{12}$GeV; and that efficient out-of-equilibrium GUT baryogenesis and/or leptogenesis can take place even if the reheat temperature is much smaller than the mass of the decaying superheavy particle.

27 pages. LaTeX (using revtex) with 10 eps figures embedded using epsf Revised version, with changes mostly in the section on the relic neutrino density in low-reheat models

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• Light Thermal Self-Interacting Dark Matter in the Shadow of Non-Standard Cosmology
• Particle Asymmetries from Quantum Statistics
• Constraining the Coexistence of Freeze-in Dark Matter and Primordial Black Holes
• Probing Gravitational Dark Matter with Ultra-high Frequency Gravitational Waves
• Post-inflationary production of particle Dark Matter: Hilltop and Coleman-Weinberg inflation
• Dynamical origin of neutrino masses and dark matter from a new confining sector
• Supersymmetry - When Theory Inspires Experimental Searches
• Gravitational particle production of superheavy massive particles in Quintessential Inflation: A numerical analysis
• Gravitational SIMPs
• Freeze-in and freeze-out production of Higgs portal Majorana fermionic dark matter during and after reheating
• Note on the reheating temperature in Starobinsky-type potentials
• Confronting Heavy Tau Neutrinos with Neutrino Oscillations
• Genesis of baryon and dark matter asymmetries through ultraviolet scattering freeze-in
• Post-inflationary Leptogenesis and Dark Matter production: Metric versus Palatini formalism
• Non-thermal production of Higgsino dark matter by late-decaying scalar fields
• Dark matter from mediator decay in early matter domination
• Asymgenesis
• Superradiant dark matter production from primordial black holes: Impact of multiple modes and gravitational wave emission
• Mesotuned WIMPs and Avoided Deconfinement
• ACT DR6 Insights on the Inflationary Attractor models and Reheating
• Non-Thermal Production of Sexaquark Dark Matter
• Reheating via gravitational particle production in simple models of quintessence or $\Lambda$CDM inflation
• Neutrino physics from cosmological observations
• AliCPT Sensitivity to Cosmic Reheating
• Glueball dark matter in non-standard cosmologies
• Parametric Coincidence in the Baryon to Dark Matter Ratio from Affleck-Dine Baryogenesis and UV Freeze-in Dark Matter
• Asymmetric Dark Matter Abundance Including Non-thermal production
• Non-thermal Dark Matter in $U(1{)}_{B-L}$ Extension of Inert Doublet Model
• Metastable cosmic strings are broken at the start
• Kination cosmology from scalar fields and gravitational-wave signatures
• Roads for Right-handed Neutrino Dark Matter: Fast Expansion, Standard Freeze-out, and Early Matter Domination
• Neutrino physics from Cosmology
• Heavy Gravitino from Dynamical Generation of Right-Handed Neutrino Mass Scale, and Gravitational Waves