Sensitivity of gravitational waves from preheating to a scalar field's interactions

Abstract

After inflation, a period of preheating may have produced a stochastic background of high frequency gravitational waves (GWs) that would persist until today. The nature of the inflaton's coupling to Standard Model or other fields is unknown, so it is useful to ask what features such fields may typically have, and how these affect predictions for the GW's produced. Here we consider the inflaton to be coupled to a light scalar field, and show that even a very small quartic self-interaction term will reduce the amplitude of the GW spectrum. For self-coupling ${\lambda }_{\chi }\gtrsim g^2$, where $g^2$ is the inflaton-scalar coupling, the peak energy density goes as ${\Omega }_{\mathrm{gw}}^{({\lambda }_{\chi })}/{\Omega }_{\mathrm{gw}}^{({\lambda }_{\chi }=0)}\sim (g^2/{\lambda }_{\chi }{)}^2$. A consequence is that if the universe reheats through an inflaton-Higgs coupling then the spectrum would be suppressed but the dynamics would be sensitive to the Higgs potential near the energy scale of inflation.

19 pages, 4 figures. Added Section V and some references. Version accepted by PRD

References in corpus (24)

• Gravitational-wave sensitivity curves
• Reheating in Inflationary Cosmology: Theory and Applications
• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• Theory and Numerics of Gravitational Waves from Preheating after Inflation
• A Gravitational Wave Background from Reheating after Hybrid Inflation
• Gravitational Wave Production At The End Of Inflation
• Cosmological implications of the Higgs mass measurement
• The lifetime of the electroweak vacuum and sensitivity to Planck scale physics
• Gravitational Waves from Abelian Gauge Fields and Cosmic Strings at Preheating
• Improved Upper Limits on the Stochastic Gravitational-Wave Background from 2009-2010 LIGO and Virgo Data
• Top mass determination, Higgs inflation, and vacuum stability
• Search for a stochastic background of 100-MHz gravitational waves with laser interferometers
• Laser-interferometric Detectors for Gravitational Wave Background at 100 MHz : Detector Design and Sensitivity
• DEFROST: A New Code for Simulating Preheating after Inflation
• Nonlinear Inflaton Fragmentation after Preheating
• Inflationary cosmology and the standard model Higgs with a small Hubble induced mass
• Gravitational waves from fragmentation of a primordial scalar condensate into Q-balls
• Gravitational waves from the fragmentation of a supersymmetric condensate
• Non-Abelian dynamics in the resonant decay of the Higgs after inflation
• Curvaton Decay by Resonant Production of the Standard Model Higgs
• Gravitational waves from Affleck-Dine condensate fragmentation
• Higgs vacuum stability and inflationary dynamics after BICEP2 and PLANCK dust polarisation data
• Gravitational-Wave Mediated Preheating
• Thermal blocking of preheating

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• Inflation, (P)reheating and Neutrino Anomalies: Production of Sterile Neutrinos with Secret Interactions
• Relativistic viscous effects on the primordial gravitational waves spectrum
• Detectable Gravitational Waves from preheating probes non-thermal Dark Matter