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The impact of dark matter (DM) and dark energy (DE) interactions on cosmic evolution within a viscous dark energy (VDE) framework have been examined in this work. Expanding beyond traditional interacting dark energy (IDE) models, we introduce a generalized IDE model that adapts to various scenarios through coupling parameters. To explore deviations from \(\varLambda \) CDM, we focus on how viscosity and DM-DE interactions affect cosmic density and expansion. Using the Union 2.1 Supernova Ia data set and Markov Chain Monte Carlo (MCMC) sampling, we determine optimal model parameters, which are shedding light on the role of viscous and IDE interactions in the Universe’s expansion.

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

  • 会议论文

  • 发表日期：

    2025年

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  • Madhurima Pandey,
  • Ashadul Halder,
  • Debasish Majumdar,
  • Rupa Basu

摘要

The impact of dark matter (DM) and dark energy (DE) interactions on cosmic evolution within a viscous dark energy (VDE) framework have been examined in this work. Expanding beyond traditional interacting dark energy (IDE) models, we introduce a generalized IDE model that adapts to various scenarios through coupling parameters. To explore deviations from \(\varLambda \) CDM, we focus on how viscosity and DM-DE interactions affect cosmic density and expansion. Using the Union 2.1 Supernova Ia data set and Markov Chain Monte Carlo (MCMC) sampling, we determine optimal model parameters, which are shedding light on the role of viscous and IDE interactions in the Universe’s expansion.