Gravitational Waves from Preheating in Gauss-Bonnet Inflation

Abstract

We study gravitational wave production in an expanding Universe during the first stages following inflation, and investigate the consequences of the Gauss-Bonnet term on the inflationary parameters for a power-law inflation model with a GB coupling term. Moreover, we perform the analyses on the preheating parameters involving the number of e-folds $N_{pre}$, and the temperature of thermalization $T_{th},$ and show that it's sensitive to the parameters $n$, and $\gamma$, the parameter $\gamma$ is proposed to connect the density energy at the end of inflation to the preheating energy density. We set a correlation of gravitational wave energy density spectrum with the spectral index $n_s$ detected by the cosmic microwave background experiments$.$ The density spectrum ${\Omega }_{gw}$ shows good consistency with observation for $\gamma =10^3$ and $10^6$. Our findings suggest that the generation of gravitational waves (GWs) during preheating can satisfy the constraints from Planck's data.

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• Primordial black holes and gravitational waves in teleparallel Gravity
• Preheating constraints in $\alpha$-attractor inflation and Gravitational Waves production
• Cosmic jerk parameter in symmetric teleparallel cosmology
• A possible solution to the Hubble tension from quantum gravity
• Sound Speed Resonance of Gravitational Waves in Gauss-Bonnet-coupled inflation
• Nonlinear dynamics of oscillons and transients during preheating after single field inflation