XXVI DAE-BRNS High Energy Physics Symposium 2024

Exploring the Effects of Dark Matter - Dark Energy Interaction on Cosmic Evolution in Viscous Dark Energy Scenario

Not scheduled

20m

Swatantrata Bhavan, Banaras Hindu University, Varanasi

Oral Astroparticle physics and cosmology

Speaker

Dr Madhurima Pandey (Haldia Institute of Technology)

Description

We explore the influence of interactions between dark matter and dark energy on the cosmic evolution of the Universe within a viscous dark energy (VDE) framework. Moving beyond traditional interacting dark energy (IDE) models, we propose a generalized IDE model adaptable to diverse IDE scenarios via IDE coupling parameters. In order to investigate deviations from $\Lambda$CDM across cosmic epochs by highlighting how viscous and the interaction between dark matter and dark energy impact cosmic density and expansion rates, we consider a model agnostic form of VDE. Eventually we perform a Bayesian analysis using the Union 2.1 Supernova Ia dataset and Markov Chain Monte Carlo (MCMC) sampling to obtain the optimal values of model parameters. This comprehensive analysis provides insights about the interplay between viscous and IDE in shaping the Universe's expansion history.