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Observational constraints on variable equation of state parameters of dark matter and dark energy after Planck

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arxiv 1207.5582 v4 pith:2ZSNBZ2D submitted 2012-07-24 gr-qc astro-ph.CO

Suresh Kumar , Lixin Xu This is my paper
classification gr-qcastro-ph.CO
keywords darkmatterobservationaldataenergyequationparametersstate
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In this paper, we study a cosmological model in general relativity within the framework of spatially flat Friedmann-Robertson-Walker space-time filled with ordinary matter (baryonic), radiation, dark matter and dark energy, where the latter two components are described by Chevallier-Polarski-Linder equation of state parameters. We utilize the observational data sets from SNLS3, BAO and Planck+WMAP9+WiggleZ measurements of matter power spectrum to constrain the model parameters. We find that the current observational data offer tight constraints on the equation of state parameter of dark matter. We consider the perturbations and study the behavior of dark matter by observing its effects on CMB and matter power spectra. We find that the current observational data favor the cold dark matter scenario with the cosmological constant type dark energy at the present epoch.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Is Dark Matter Really Matter?

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    Using DESI DR2, DES supernovae, and two CMB likelihoods, the authors find wDM about 0.001 and wDE about -0.94 when varied jointly, a roughly 2-sigma joint preference away from Lambda-CDM, with a non-phantom Pade-w plu...

  2. Accelerating scaling solutions from dark matter particle creation

    gr-qc 2026-04 unverdicted novelty 5.0 of 10

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  3. Exploring non-cold dark matter in a scenario of dynamical dark energy with DESI DR2 data

    astro-ph.CO 2025-07 conditional novelty 5.0 of 10

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  4. Modeling dark matter halos with self-interacting fermions: A polytropic approach

    hep-ph 2025-12 reject novelty 4.0 of 10

    A single ~40 eV self-interacting fermion is claimed to fit rotation curves of many galaxies with one adjustable density per galaxy, but fit quality and reported parameter ranges are inconsistent.

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    Interacting k-essence dark energy and non-pressureless dark matter models with two interaction forms are shown to reproduce major cosmological epochs and fit observations comparably to LambdaCDM while admitting late-t...

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