https://doi.org/10.1140/epjp/s13360-025-06234-y
Regular Article
Exploring the effects of dark matter–dark energy interaction on cosmic evolution in viscous dark energy scenario
1
St. Xavier’s College (Autonomous), 30 Mother Teresa Sarani, 700016, Kolkata, India
2
Department of Physics, School of Applied Sciences and Humanities, Haldia Institute of Technology, 721657, Haldia, West Bengal, India
3
Ramakrishna Mission Vivekananda Educational and Research Institute, G. T. Road, Belur Math, 711202, Howrah, India
Received:
13
February
2025
Accepted:
16
March
2025
Published online:
15
April
2025
We explore the influence of interactions between dark matter (DM) and dark energy (DE) 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 
CDM across cosmic epochs by highlighting how viscous and the interactions between DM and DE 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 optimal values of model parameters. This comprehensive analysis provides insights about the interplay between viscous and IDE in shaping the Universe’s expansion history.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
