Testing the warmness of dark matter

Abstract

Dark matter (DM) as a pressureless perfect fluid provides a good fit of the standard $\Lambda$CDM model to the astrophysical and cosmological data. In this paper, we investigate two extended properties of DM: a possible time dependence of the equation of state of DM via Chevallier-Polarski-Linder parametrization, $w_{\mathrm{dm}}=w_{dm0}+w_{dm1}(1-a)$, and the constant non-null sound speed ${\hat{c}}_{\mathrm{s},\mathrm{dm}}^2$. We analyze these DM properties on top of the base $\Lambda$CDM model by using the data from Planck cosmic microwave background (CMB) temperature and polarization anisotropy, baryonic acoustic oscillations (BAO) and the local value of the Hubble constant from the Hubble Space Telescope (HST). We find new and robust constraints on the extended free parameters of DM. The most tight constraints are imposed by CMB + BAO data where the three parameters $w_{dm0}$, $w_{dm1}$ and ${\hat{c}}_{\mathrm{s},\mathrm{dm}}^2$ are respectively constrained to be less than $1.43\times 10^{-3}$, $1.44\times 10^{-3}$ and $1.79\times 10^{-6}$ at 95\% CL. All the extended parameters of DM show consistency with zero at 95\% CL, indicating no evidence beyond the CDM paradigm. We notice that the extended properties of DM significantly affect several parameters of the base $\Lambda$CDM model. In particular, in all the analyses performed here, we find significantly larger mean values of $H_0$ and lower mean values of ${\sigma }_8$ in comparison to the base $\Lambda$CDM model. Thus, the well-known $H_0$ and ${\sigma }_8$ tensions might be reconciled in the presence of extended DM parameters within the $\Lambda$CDM framework. Also, we estimate the warmness of DM particles as well as its mass scale and find a lower bound: $\sim$ 500 eV from our analyses.

arXiv comment10 pages, 6 figures, 4 tables; major revision of the first version; to appear in MNRAS

References in corpus (62)

• Planck 2015 results. XIII. Cosmological parameters
• Particle Dark Matter: Evidence, Candidates and Constraints
• The 6dF Galaxy Survey: Baryon Acoustic Oscillations and the Local Hubble Constant
• Exploring the Expansion History of the Universe
• Accelerating Universes with Scaling Dark Matter
• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• A 2.4% Determination of the Local Value of the Hubble Constant
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 10 and 11 galaxy samples
• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Cosmological Perturbation Theory in the Synchronous vs. Conformal Newtonian Gauge
• Cosmological Perturbation Theory in the Synchronous and Conformal Newtonian Gauges
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Halo Formation in Warm Dark Matter Models
• Information criteria for astrophysical model selection
• Constraining Warm Dark Matter candidates including sterile neutrinos and light gravitinos with WMAP and the Lyman-alpha forest
• Conservative Constraints on Early Cosmology: an illustration of the Monte Python cosmological parameter inference code
• The trouble with $H_0$
• Planck 2013 results. XX. Cosmology from Sunyaev-Zeldovich cluster counts
• Structure Formation with Generalized Dark Matter
• Tale of stable interacting dark energy, observational signatures, and the $H_0$ tension
• A Lower Growth Rate from Recent Redshift Space Distortion Measurements than Expected from Planck
• Echo of interactions in the dark sector
• Prospects for resolving the Hubble constant tension with standard sirens
• Probing the interaction between dark matter and dark energy in the presence of massive neutrinos
• Is there a "too big to fail" problem in the field?
• The implications of an extended dark energy cosmology with massive neutrinos for cosmological tensions
• Interacting dark energy with time varying equation of state and the $H_0$ tension
• Lyman-alpha Forest Constraints on the Mass of Warm Dark Matter and the Shape of the Linear Power Spectrum
• Tension between the power spectrum of density perturbations measured on large and small scales
• Structure formation in $f(T)$ gravity and a solution for $H_0$ tension
• A Vacuum Phase Transition Solves $H_0$ Tension
• Dark sector interaction: a remedy of the tensions between CMB and LSS data
• Observational constraints on one-parameter dynamical dark-energy parametrizations and the $H_0$ tension
• "Non-cold" dark matter at small scales: a general approach
• New observational constraints on f(T) gravity from cosmic chronometers
• Converting non-relativistic dark matter to radiation
• Measuring the Speed of Dark: Detecting Dark Energy Perturbations
• Constraining Non-Cold Dark Matter Models with the Global 21-cm Signal
• Observational constraints on variable equation of state parameters of dark matter and dark energy after Planck
• Combining rotation curves and gravitational lensing: How to measure the equation of state of dark matter in the galactic halo
• Cosmological bounds on the equation of state of dark matter
• Hubble Space Telescope/Advanced Camera for Surveys Confirmation of the Dark Substructure in A520
• The Dark Matter equation of state through cosmic history
• The reliability of the AIC method in Cosmological Model Selection
• Cosmological discordances: a new measure, marginalization effects, and application to geometry vs growth current data sets
• Gravitational Waves in Cold Dark Matter
• Cosmological bounds on dark matter-photon coupling
• Constraints on dark-matter properties from large-scale structure
• Constraining dark matter properties with Cosmic Microwave Background observations
• How Cold is Cold Dark Matter?
• An extensive investigation of the Generalised Dark Matter model
• Warm dark matter and the ionization history of the Universe
• Measuring the dark matter equation of state
• Equation of State of Dark Matter after Planck Data
• Constraints on warm dark matter from weak lensing in anomalous quadruple lenses
• Cosmological searches for a non-cold dark matter component
• Thermodynamic aspects of dark energy fluids
• Cosmological Constraints on Variable Warm Dark Matter
• Testing dark matter warmness and quantity via the reduced relativistic gas model
• On general features of warm dark matter with reduced relativistic gas
• Interacting warm dark matter
• Forecasts for Warm Dark Matter from Photometric Galaxy Surveys

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• Dark Matter properties through cosmic history
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• Gauge invariants of linearized gravity with a general background metric
• Warm and Cold Dark Matter in Bouncing Universe
• Gauge-invariant gravitational waves in matter beyond linearized gravity