Neutralino Dark Matter and the Curvaton

Abstract

We build a realistic model of curvaton cosmology, in which the energy content is described by radiation, WIMP dark matter and a curvaton component. We calculate the curvature and isocurvature perturbations, allowing for arbitrary initial density perturbations in all fluids, following all species and their perturbations from the onset of dark matter freeze-out onto well after curvaton decay. We provide detailed numerical evaluations as well as analytical formulae which agree well with the latter. We find that substantial isocurvature perturbations, as measured relatively to the total curvature perturbation, can be produced even if the curvaton energy density is well underdominant when it decays; high precision measurements of cosmic microwave background anisotropies may thus open a window on underdominant decoupled species in the pre-nucleosynthesis early Universe. We also find that in a large part of parameter space, curvaton decay produces enough dark matter particles to restore WIMP annihilations, leading to the partial erasure of any pre-existing dark matter - radiation isocurvature perturbation.

21 pages, 11 figures. Version to appear in PRD (minor changes)

References in corpus (21)

• Generating the curvature perturbation without an inflaton
• Adiabatic CMB perturbations in pre-big bang string cosmology
• Effects of Cosmological Moduli Fields on Cosmic Microwave Background
• The primordial density perturbation in the curvaton scenario
• Nongaussian Isocurvature Perturbations from Inflation
• Did Something Decay, Evaporate, or Annihilate during Big Bang Nucleosynthesis?
• On matching conditions for cosmological perturbations
• Large-scale curvature and entropy perturbations for multiple interacting fluids
• Cosmic Density Perturbations from Late-Decaying Scalar Condensations
• The influence of cosmological transitions on the evolution of density perturbations
• The Curvaton as a Pseudo-Nambu-Goldstone Boson
• Mixed inflaton and curvaton perturbations
• Neutralinos, Big Bang Nucleosynthesis and 6Li in Low-Metallicity Stars
• Adiabatic density perturbations and matter generation from the MSSM
• The CDM isocurvature perturbation in the curvaton scenario
• Must Cosmological Perturbations Remain Non-Adiabatic After Multi-Field Inflation?
• Correlated isocurvature perturbations from mixed inflaton-curvaton decay
• MSSM curvaton in the gauge-mediated SUSY breaking
• Curvature and isocurvature perturbations in a three-fluid model of curvaton decay
• Identifying the curvaton within MSSM
• Reheating and dangerous relics in pre-big bang string cosmology

Cited by in corpus (22)

• A Hemispherical Power Asymmetry from Inflation
• Reheating Effects in the Matter Power Spectrum and Implications for Substructure
• A Scale-Dependent Power Asymmetry from Isocurvature Perturbations
• The Dark Matter Annihilation Boost from Low-Temperature Reheating
• Axion Cosmology with Early Matter Domination
• Compensated isocurvature perturbations in the curvaton model
• General treatment of isocurvature perturbations and non-Gaussianities
• Inflation with an extra light scalar field after Planck
• Constraining Curvatonic Reheating
• Constraints on scalar and tensor perturbations in phenomenological and two-field inflation models: Bayesian evidences for primordial isocurvature and tensor modes
• Multiple scalar particle decay and perturbation generation
• Non-Gaussianity in three fluid curvaton model
• Constraints on moduli cosmology from the production of dark matter and baryon isocurvature fluctuations
• Probing a panoply of curvaton-decay scenarios using CMB data
• Curvaton Decay into Baryons, anti-Baryons and Radiation
• Refined Study of Isocurvature Fluctuations in the Curvaton Scenario
• The moduli problem at the perturbative level
• Lensing Bias to CMB Polarization Measurements of Compensated Isocurvature Perturbations
• Curvaton decay into relativistic matter
• Constraints on the three-fluid model of curvaton decay
• Unified Origin of Curvature Perturbation and Baryon Asymmetry of the Universe
• Testing Inflationary Cosmology