Perturbations in Matter Bounce with Non-minimal Coupling

TL;DR

This paper studies how non-minimal coupling in a matter bounce scenario affects primordial perturbations and reheating, revealing a red-tilt at large scales and enhanced particle production.

Contribution

It introduces a non-minimal coupling in the matter bounce model and analyzes its effects on perturbation spectra and reheating processes.

Findings

Non-minimal coupling causes a red-tilt in large-scale perturbations.

Enhanced reheating of normal field particles compared to minimal coupling.

Potential implications for early universe cosmology and structure formation.

Abstract

In this paper, we investigate the perturbations in matter bounce induced from Lee-Wick lagrangian with the involvement of non-minimal coupling to the Einstein Gravity. We find that this extra non-minimal coupling term can cause a red-tilt on the primordial metric perturbation at extremely large scales. It can also lead to large enhancement of reheating of the normal field particles compared to the usual minimal coupling models.