On gravitational preheating

Abstract

We consider dark matter production during the inflaton oscillation epoch. It is conceivable that renormalizable interactions between dark matter and inflaton may be negligible. In this case, the leading role is played by higher dimensional operators generated by gravity and thus suppressed by the Planck scale. We focus on dim-6 operators and study the corresponding particle production in perturbative and non-perturbative regimes. We find that the dark matter production rate is dominated by non-derivative operators involving higher powers of the inflaton field. Even if they appear with small Wilson coefficients, such operators can readily account for the correct dark matter abundance.

16 pages, 2 figures

References in corpus (13)

• Primordial Curvature Fluctuation and Its Non-Gaussianity in Models with Modulated Reheating
• Gravitational Production of Dark Matter during Reheating
• Gravitational Effects on Inflaton Decay
• Gravitational portals in the early Universe
• The Higgs Portal to Cosmology
• Standard Model with a real singlet scalar and inflation
• Spectator Dark Matter
• Beyond freeze-in: Dark Matter via inverse phase transition and gravitational wave signal
• Oscillating scalar dissipating in a medium
• Challenges for Inflaton Dark Matter
• Dark matter production and reheating via direct inflaton couplings: collective effects
• Hidden Dark Matter from Starobinsky Inflation
• Massless Preheating and Electroweak Vacuum Metastability