Extended $\Lambda$CDM model

TL;DR

This paper proposes a generalized $ ext{Lambda}$CDM cosmological model incorporating dissipative, nonextensive viscous dark matter with bulk viscosity, analyzed through Bayesian methods against recent observational data.

Contribution

It introduces a novel generalized $ ext{Lambda}$CDM model with dissipative nonextensive viscous dark matter and applies Bayesian analysis to observational data for parameter constraints.

Findings

Model fits observational data well

Provides constraints on viscous dark matter parameters

Extends standard cosmological models with dissipative effects

Abstract

In this work we discuss a general approach for the dissipative dark matter considering a nonextensive bulk viscosity and taking into account the role of generalized Friedmann equations. This generalized $\Lambda$CDM model encompasses a flat universe with a dissipative nonextensive viscous dark matter component, following the Eckart theory of bulk viscosity. In order to compare models and constrain cosmological parameters, we perform Bayesian analysis using one of the most recent observations of Type Ia Supernova, baryon acoustic oscillations, and cosmic microwave background data.