Gravitational waves from smooth hybrid new infation

TL;DR

This paper models gravitational wave production during a double inflation scenario, showing that the resulting waves could be detectable by future gravitational wave observatories.

Contribution

It introduces a detailed lattice simulation approach to analyze gravitational wave generation in a double inflation model, highlighting potential observability.

Findings

Gravitational waves are produced by scalar field fluctuations during the transition between inflationary stages.

The characteristic frequency of these waves can be within the detection range of planned experiments.

The second inflationary stage redshifts the waves, making them observable today.

Abstract

We calculate the production of the gravitational waves from a double inflation model with lattice simulations. Between the two inflationary stages, gravitational waves with a characteristic frequency are produced by fluctuations of the scalar fields enhanced through parametric resonance. The wavelength of the produced gravitational waves gets extra redshift during the second inflationary stage and it can be in the observable range for the direct gravitational wave detectors. It is found that there is a possibility for the produced gravitational waves to be detected in the planned experiments.