# Poincar\'e Gauge Gravity Cosmology

## TL;DR

This paper develops a Poincaré gauge gravity cosmology framework, deriving an analytic background solution that explains universe evolution without dark energy, and tests it against supernova data.

## Contribution

It introduces a novel cosmological model based on Poincaré gauge gravity with a modified redshift relation, providing analytic solutions and observational constraints.

## Key findings

- Universe evolution can be explained without dark energy.
- The model's parameters are tightly constrained by supernova data.
- Modified redshift relation impacts cosmological parameter estimation.

## Abstract

In this work, we construct the logical framework of the Poincar\'e gauge gravity cosmology based on five postulations, and introduce the modified redshift relation within this framework. Then we solve a system with quadratic action and some other assumptions to get an analytic solution on background level. The evolution of the Universe on background can be reproduced from this solution without hypothesizing dark energy. Further, we use the type Ia supernova data set JLA to test the effect of the modified redshift relation under the constraints of system parameters. The results show that the constraint on some parameters are compact.