Is it possible to tell the difference between fermionic and bosonic hot dark matter?

Abstract

We study the difference between thermally produced fermionic and bosonic hot dark matter in detail. In the linear regime of structure formation, their distinct free-streaming behaviours can lead to pronounced differences in the matter power spectrum. While not detectable with current cosmological data, such differences will be clearly observable with upcoming large scale weak lensing surveys for particles as light as m_HDM ~ 0.2 eV. In the nonlinear regime, bosonic hot dark matter is not subject to the same phase space constraints that severely limit the amount of fermionic hot dark matter infall into cold dark matter halos. Consequently, the overdensities in fermionic and bosonic hot dark matter of equal particle mass can differ by more than a factor of five in the central part of a halo. However, this unique manifestation of quantum statistics may prove very difficult to detect unless the mass of the hot dark matter particle and its decoupling temperature fall within a very narrow window, 1 < m_HDM/eV < 4 and g* < 30. In this case, hot dark matter infall may have some observable consequences for the nonlinear power spectrum and hence the weak lensing convergence power spectrum at l ~ 10^3 - 10^4 at the percent level.

18 pages, 9 figures, uses iopart.cls

References in corpus (38)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• Cosmological parameters from SDSS and WMAP
• Large scale bias and the peak background split
• Weak Gravitational Lensing
• Profiles of dark haloes: evolution, scatter, and environment
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• Halo Models of Large Scale Structure
• Analytic model for galaxy and dark matter clustering
• Halo occupation numbers and galaxy bias
• Constraining Warm Dark Matter candidates including sterile neutrinos and light gravitinos with WMAP and the Lyman-alpha forest
• Weighing Neutrinos with Galaxy Surveys
• Weak Lensing and Cosmology
• Deriving the Nonlinear Cosmological Power Spectrum and Bispectrum from Analytic Dark Matter Halo Profiles and Mass Functions
• Gravitational clustering of relic neutrinos and implications for their detection
• Neutrino masses and the number of neutrino species from WMAP and 2dFGRS
• Baryons and weak lensing power spectra
• Axino dark matter from thermal production
• Effect of Hot Baryons on the Weak-Lensing Shear Power Spectrum
• Observables sensitive to absolute neutrino masses: Constraints and correlations from world neutrino data
• Current cosmological bounds on neutrino masses and relativistic relics
• Cosmological mass limits on neutrinos, axions, and other light particles
• Neutrino Clustering in Cold Dark Matter Halos : Implications for Ultra High Energy Cosmic Rays
• Weak Lensing from Space III: Cosmological Parameters
• Neutrino Masses from Cosmological Probes
• Neutrino mass limits from SDSS, 2dFGRS and WMAP
• The Nonlinear Cosmological Matter Power Spectrum with Massive Neutrinos I: The Halo Model
• Dissecting a galaxy: mass distribution of 2237+0305
• Breaking the Disk/Halo Degeneracy with Gravitational Lensing
• Axionic Hot Dark Matter in the Hadronic Axion Window
• Weak Lensing from Space II: Dark Matter Mapping
• Do observations prove that cosmological neutrinos are thermally distributed?
• Violent Relaxation of Indistinguishable Objects and Neutrino Hot Dark Matter in Clusters of Galaxies
• A Gauge-Mediation Model with a Light Gravitino of Mass O(10) eV and the Messenger Dark Matter
• Probing galaxy density profiles with future supernova surveys

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• Primordial Neutrinos
• Measuring neutrino masses and dark energy with weak lensing tomography
• Higher order corrections to the large scale matter power spectrum in the presence of massive neutrinos
• Future CMB tests of dark matter: ultra-light axions and massive neutrinos
• Compact stars with a small electric charge: the limiting radius to mass relation and the maximum mass for incompressible matter
• Tests of Neutrino and Dark Radiation Models from Galaxy and CMB surveys
• Probing Beyond the Standard Model Physics with Double-beta Decays
• Non-thermal Hot Dark Matter from Inflaton/Moduli Decay: The Momentum Distribution and Relaxing the Cosmological Mass Bound
• Cosmological N-body simulations with generic hot dark matter
• Cosmic Bose dark matter
• Daughters mimic sterile neutrinos (almost!) perfectly
• Cosmological bounds on neutrino statistics
• The Jeans theorem and the "Tolman-Oppenheimer-Volkov equation" in an exact wave solution of R^2 gravity