Cosmological implications of inflaton-mediated dark and visible matter scatterings after reheating

Abstract

The initial density of dark matter (DM) particles, otherwise secluded from the standard model (SM), may be generated at reheating, with an initial temperature ratio for internal thermalizations, ${\xi }_i=T_{\mathrm{DM},\mathrm{i}}/T_{\mathrm{SM},\mathrm{i}}$. This scenario necessarily implies inflaton-mediated scatterings between DM and SM after reheating, with a rate fixed by the relic abundance of DM and the reheat temperature. These scatterings can be important for an inflaton mass and reheat temperature as high as $\mathcal{O}(10^7\mathrm{GeV})$ and $\mathcal{O}(10^9\mathrm{GeV})$, respectively, since the thermally averaged collision terms become approximately independent of the inflaton mass when the bath temperature is larger than the mass. The impact of these scatterings on DM cosmology is studied modeling the perturbative reheating physics by a gauge-invariant set of inflaton interactions upto dimension-5 with the SM gauge bosons, fermions and the Higgs fields. It is observed that an initially lower (higher) DM temperature will rapidly increase (decrease), even with very small couplings to the inflaton. There is a sharp lower bound on the DM mass below which the relic abundance cannot be satisfied due to faster back-scatterings depleting DM quanta to SM particles. For low DM masses, the CMB constraints become stronger due to the collisions for ${\xi }_i<1$, probing values as small as $\mathcal{O}(10^{-4})$, and weaker for ${\xi }_i>1$. The BBN constraints become stronger due to the collisions for lower DM masses, probing ${\xi }_i$ as small as $\mathcal{O}(0.1)$, and weaker for higher DM mass. Thus inflaton-mediated collisions with predictable rates, relevant even for high-scale inflation models, can significantly impact the cosmology of light DM.

arXiv comment19 pages, 10 figures; v2: comments added, version as published in Physical Review D

References in corpus (41)

• Towards the Theory of Reheating After Inflation
• Reheating after Inflation
• Wino Cold Dark Matter from Anomaly-Mediated SUSY Breaking
• Reheating in Inflationary Cosmology: Theory and Applications
• New Constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-$\alpha$ forest data
• Superheavy dark matter
• Lyman-alpha constraints on warm and on warm-plus-cold dark matter models
• Big-Bang Nucleosynthesis After Planck
• Nonthermal Supermassive Dark Matter
• Reheating and Post-inflationary Production of Dark Matter
• Thermal Dark Matter From A Highly Decoupled Sector
• Inflaton Oscillations and Post-Inflationary Reheating
• On the Solution to the Polonyi Problem with $O$(10~TeV) Gravitino Mass in Supergravity
• Dark Matter Production in Late Time Reheating
• Thermalisation after inflation
• Constraint on the Reheating Temperature from the Decay of the Polonyi Field
• Chilly Dark Sectors and Asymmetric Reheating
• Prethermalization Production of Dark Matter
• Post-Inflationary Gravitino Production Revisited
• Gravitational reheating
• Reheating the Standard Model from a hidden sector
• Light Dark Matter from Inflaton Decay
• Dark Matter Production during the Thermalization Era
• Boltzmann or Bogoliubov? Approaches Compared in Gravitational Particle Production
• Can oscillating scalar fields decay into particles with a large thermal mass?
• Scalar Dark Matter Production from Preheating and Structure Formation Constraints
• Cannibalism hinders growth: Cannibal Dark Matter and the $S_8$ tension
• Cannibal Dark Matter and Large Scale Structure
• Real Scalar Dark Matter: Relativistic Treatment
• Energy Spectrum of Thermalizing High Energy Decay Products in the Early Universe
• Signatures of Non-thermal Dark Matter with Kination and Early Matter Domination: Gravitational Waves versus Laboratory Searches
• Observational Constraints on Decoupled Hidden Sectors
• Light Higgsino in Heavy Gravitino Scenario with Successful Electroweak Symmetry Breaking
• Symmetric and Asymmetric Reheating
• Reheating in two-sector cosmology
• Reproductive Freeze-In of Self-Interacting Dark Matter
• Dark matter production and reheating via direct inflaton couplings: collective effects
• Momentum distribution of dark matter produced in inflaton decay: effect of inflaton mediated scatterings
• Inflection-point Inflation and Dark Matter Redux
• Non-thermal Hot Dark Matter from Inflaton/Moduli Decay: The Momentum Distribution and Relaxing the Cosmological Mass Bound
• Cannibal dark matter decoupled from standard model: cosmological constraints

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