# Constraints on a generalized deceleration parameter from cosmic chronometers

## TL;DR

This study introduces a generalized deceleration parameter model to analyze the universe's expansion history, using cosmic chronometer and supernova data to constrain its parameters, supporting the standard Lambda-CDM model.

## Contribution

The paper proposes a new generalized parametrization of the deceleration parameter that encompasses existing models and constrains it using recent observational data.

## Key findings

- Constraints support the Lambda-CDM model within 1 sigma
- Model reproduces known q-parametrized models for specific parameters
- Observational data favor a universe with accelerated expansion

## Abstract

In this paper, we have proposed a generalized parametrization for the deceleration parameter $q$ in order to study the evolutionary history of the universe. We have shown that the proposed model can reproduce three well known $q$-parametrized models for some specific values of the model parameter $\alpha$. We have used the latest compilation of the Hubble parameter measurements obtained from the cosmic chronometer (CC) method (in combination with the local value of the Hubble constant $H_{0}$) and the Type Ia supernova (SNIa) data to place constraints on the parameters of the model for different values of $\alpha$. We have found that the resulting constraints on the deceleration parameter and the dark energy equation of state support the $\Lambda$CDM model within $1\sigma$ confidence level at the present epoch.