# Dynamics of Cosmological Perturbations and Reheating in the Anamorphic Universe

## TL;DR

This paper analyzes the behavior of cosmological perturbations and particle production in the Anamorphic universe model, highlighting the need for a new reheating mechanism similar to inflation.

## Contribution

It provides a detailed analysis of scalar-tensor realizations of the Anamorphic scenario and explores the implications for reheating and perturbation dynamics.

## Key findings

- Constraints on model parameters derived from perturbation analysis
- Gravitational Parker particle production quantified during contraction
- Reheating requires a new mechanism beyond particle production

## Abstract

We discuss scalar-tensor realizations of the Anamorphic cosmological scenario recently proposed by Ijjas and Steinhardt. Through an analysis of the dynamics of cosmological perturbations we obtain constraints on the parameters of the model. We also study gravitational Parker particle production in the contracting Anamorphic phase and we compute the fraction between the energy density of created particles at the end of the phase and the background energy density. We find that, as in the case of inflation, a new mechanism is required to reheat the universe.