Extended $\Lambda$CDM model

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.

10 pages, 5 figures, 1 table. Expanded discussion in the Results and Conclusions. Added references

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Cited by in corpus (15)

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• Late-time decaying dark matter: constraints and implications for the $H_0$-tension
• Cosmological perturbations in the Tsallis holographic dark energy scenarios
• Fractional Dark Matter decay: cosmological imprints and observational constraints
• Growth of matter perturbations in the extended viscous dark energy models
• Extended $\Lambda$CDM model and viscous dark energy: A Bayesian analysis
• Bayesian Comparison of the Cosmic Duality Scenarios
• Can decaying dark matter scenarios alleviate both $H_0$ and ${\sigma }_8$ tensions?
• Non-Gaussian thermostatistical considerations upon the Saha equation
• Thermodynamic Constraints on the Dark Sector
• Non-particle dark matter from Hubble parameter
• On a possible cosmological evolution of galaxy cluster $Y_{\mathrm{X}}-Y_{\mathrm{SZE}}$ scaling relation
• Observational constraints in late time for an axially symmetric transitioning model with bulk viscous fluid
• Accurate analytic approximation for a fractional differential equation with a modified Bessel function term