Gravitational reheating and superheavy Dark Matter creation after inflation with non-minimal coupling

Abstract

We discuss the gravitational creation of superheavy particles $\chi$ in an inflationary scenario with a quartic potential and a non-minimal coupling between the inflaton $\phi$ and the Ricci curvature: $\xi {\phi }^{2}R/2$. We show that for large constants $\xi >>1$, there can be abundant production of particles $\chi$ with masses largely exceeding the inflationary Hubble rate $H_{infl}$, up to $(afew)\times \xi H_{infl}$, even if they are conformally coupled to gravity. We discuss two scenarios involving these gravitationally produced particles $\chi$. In the first scenario, the inflaton has only gravitational interactions with the matter sector and the particles $\chi$ reheat the Universe. In this picture, the inflaton decays only due to the cosmic expansion, and effectively contributes to dark radiation, which can be of the observable size. The existing limits on dark radiation lead to an upper bound on the reheating temperature. In the second scenario, the particles $\chi$ constitute Dark Matter, if substantially stable. In this case, their typical masses should be in the ballpark of the Grand Unification scale.

arXiv comment26 pages, 3 figures; minor changes; matches journal version

References in corpus (35)

• Planck 2018 results. X. Constraints on inflation
• The Standard Model Higgs boson as the inflaton
• Towards the Theory of Reheating After Inflation
• Cosmological Backgrounds of Gravitational Waves
• Quintessential inflation
• What is the lowest possible reheating temperature?
• Superheavy dark matter
• On the Naturalness of Higgs Inflation
• Power-counting and the Validity of the Classical Approximation During Inflation
• Big-Bang Nucleosynthesis After Planck
• Nonthermal Supermassive Dark Matter
• Neutrino Physics from the Cosmic Microwave Background and Large Scale Structure
• Matter Creation via Vacuum Fluctuations in the Early Universe and Observed Ultra-High Energy Cosmic Ray Events
• Ultra-High Energy Cosmic Rays, Superheavy Long-Living Particles, and Matter Creation after Inflation
• Production of Purely Gravitational Dark Matter: The Case of Fermion and Vector Boson
• Production of Purely Gravitational Dark Matter
• Inflaton Decay and Heavy Particle Production with Negative Coupling
• Higgs Scalaron Mixed Inflation
• Robust forecasts on fundamental physics from the foreground-obscured, gravitationally-lensed CMB polarization
• Violent Preheating in Inflation with Nonminimal Coupling
• Scalaron the healer: removing the strong-coupling in the Higgs- and Higgs-dilaton inflations
• Preheating after Multifield Inflation with Nonminimal Couplings, I: Covariant Formalism and Attractor Behavior
• Cosmological particle production and the precision of the WKB approximation
• On the violent preheating in the mixed Higgs-$R^2$ inflationary model
• Light inflaton after LHC8 and WMAP9 results
• Gravitational production of super-Hubble-mass particles: an analytic approach
• Preheating after multifield inflation with nonminimal couplings, II: Resonance Structure
• Despicable Dark Relics: generated by gravity with unconstrained masses
• Gravitational reheating through conformally coupled superheavy scalar particles
• Reheating in quintessential inflation via gravitational production of heavy massive particles: A detailed analysis
• Some like it hot: $R^2$ heals Higgs inflation, but does not cool it
• Inconsistency of an inflationary sector coupled only to Einstein gravity
• Reheating of the universe after inflation with f(phi)R gravity
• Gravitational wave signals and cosmological consequences of gravitational reheating
• Time-Scales for Nonlinear Processes in Preheating after Multifield Inflation with Nonminimal Couplings

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• Gravitational dark matter production in Palatini preheating
• Testing Super-Heavy Dark Matter from Primordial Black Holes with Gravitational Waves
• Dark matter production via a non-minimal coupling to gravity
• The Spectrum of Dark Radiation as a Probe of Reheating
• Computation of Gravitational Particle Production Using Adiabatic Invariants
• Gravitational Dark Matter from Minimal Preheating
• Massless Preheating and Electroweak Vacuum Metastability
• Gravitational reheating in Starobinsky inflation
• Non-perturbative production of fermionic dark matter from fast preheating
• From Hubble to Bubble
• Gauge Field Production and Schwinger Reheating in Runaway Axion Inflation
• Gravitational Wave Probe of Gravitational Dark Matter from Preheating
• Physical scale adiabatic regularization in cosmological spacetimes
• Reheating in the kination epoch via multi-channel decay of gravitationally created massive scalars