# Semiclassical cosmology with polymer matter

## TL;DR

This paper explores the effects of applying polymer quantization to matter in semiclassical cosmology, revealing inflationary behavior and the importance of quantizing both gravity and matter for a complete cosmological model.

## Contribution

It introduces a semiclassical cosmological model with polymer quantized matter while keeping gravity classical, highlighting the significance of matter quantization.

## Key findings

- Demonstrates inflationary dynamics with polymer matter
- Shows classical universe emergence at late times
- Indicates singularity remains unresolved without quantum gravity

## Abstract

In loop quantum cosmology, polymer quantization is applied to gravity and Schrodinger quantization to matter. This approach misses interesting cosmological dynamics coming from the polymer quantization of matter. We demonstrate this in semiclassical cosmology with a scalar field and pressureless dust: gravity is kept classical, dust is used to fix the time gauge, and polymer quantization effects are isolated in the scalar field. The resulting dynamics shows a period of inflation, both with and without a scalar potential, and the emergence of a classical universe at late times. Since gravity is not quantized, the cosmological singularity is not resolved, but our results suggest that polymer quantization of both gravity and matter are important for a complete picture.