PREPRINT
F19955D4-82AB-47B7-96C6-733B76647B82

Gravitational waves from primordial scalar and tensor perturbations

Zhe Chang, Xukun Zhang, Jing-Zhi Zhou

Submitted on 15 September 2022

Abstract

We investigate the second order gravitational waves induced by the primordial scalar and tensor perturbations during radiation-dominated era. The explicit expressions of the power spectra of the second order GWs are presented. We calculate the energy density spectra of the second order GWs for a monochromatic primordial power spectra. For large k (k>k), the effects of the primordial tensor perturbation with tensor-to-scalar ratio r=Ah/Aζ=0.2 lead to an around 50% increase of the signal-to-noise ratio (SNR) for LISA observations.

Preprint

Subjects: Astrophysics - Cosmology and Nongalactic Astrophysics; General Relativity and Quantum Cosmology

URL: https://arxiv.org/abs/2209.07693