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<p>The cosmic dynamics of the interacting dark energy is analyzed in the homogeneous and anisotropic spacetime. In particular, the energy exchange mechanism of the dark sector has been studied with the radiation and baryonic matter in the Bianchi I spacetime. The propagation equations of the expansion and shear scalar have been solved to write the mean Hubble parameter. The posterior phase space of the parameters are portrayed by using the latest supernovae type Ia data from Pantheon+SH0ES sample along with the DESI-BAO, CMB and expansion rate data. It is observed that the parameter space of the interacting models are degenerate in the Bayesian approach based MCMC analysis. However, the joint dataset incorporating CMB data may break this degeneracy. The slowing down of cosmic expansion rate appears to be consistent with the observations. The interacting dark energy may provide a mechanism for the anisotropy dissipation. Furthermore, the interacting dark energy may aid partially in relieving the Hubble tension in these models. However, in these varying dark energy models, the extent of anisotropy may be higher as compared to the constant dark energy density model.</p>

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The dark sector coupling in anisotropic model: observational aspects and cosmic dynamics

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Ashutosh Singh,
  • Syamala Krishnannair

摘要

The cosmic dynamics of the interacting dark energy is analyzed in the homogeneous and anisotropic spacetime. In particular, the energy exchange mechanism of the dark sector has been studied with the radiation and baryonic matter in the Bianchi I spacetime. The propagation equations of the expansion and shear scalar have been solved to write the mean Hubble parameter. The posterior phase space of the parameters are portrayed by using the latest supernovae type Ia data from Pantheon+SH0ES sample along with the DESI-BAO, CMB and expansion rate data. It is observed that the parameter space of the interacting models are degenerate in the Bayesian approach based MCMC analysis. However, the joint dataset incorporating CMB data may break this degeneracy. The slowing down of cosmic expansion rate appears to be consistent with the observations. The interacting dark energy may provide a mechanism for the anisotropy dissipation. Furthermore, the interacting dark energy may aid partially in relieving the Hubble tension in these models. However, in these varying dark energy models, the extent of anisotropy may be higher as compared to the constant dark energy density model.