Gravitino Dark Matter and Non-Gaussianity

Abstract

We investigate density fluctuations in a scenario with gravitino dark matter in the framework of modulated reheating, which is known to generate large non-Gaussianity. We show that gravitino dark matter is disfavored if primordial fluctuations have large local-type non-Gaussianity in this framework. We also briefly discuss the case with the curvaton mechanism and some other possible dark matter scenarios.

12 pages, published in PLB

References in corpus (25)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Big-Bang Nucleosynthesis and Gravitino
• Non-Gaussianity in the modulated reheating scenario
• Moduli-Induced Gravitino Problem
• Optimal limits on f_{NL}^{local} from WMAP 5-year data
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• Curvaton with Polynomial Potential
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• Curvaton Dynamics and the Non-Linearity Parameters in Curvaton Model
• Large Non-Gaussianity Implication for Curvaton Scenario
• Curvature perturbation from symmetry breaking the end of inflation
• Non-Gaussianity and Baryonic Isocurvature Fluctuations in the Curvaton Scenario
• Axino warm dark matter and ${\Omega }_b-{\Omega }_{DM}$ coincidence
• Upper Limits on the Peccei-Quinn Scale and on the Reheating Temperature in Axino Dark Matter Scenarios
• Constraints on moduli cosmology from the production of dark matter and baryon isocurvature fluctuations
• Long wavelength limit of evolution of nonlinear cosmological perturbations
• The moduli problem at the perturbative level

Cited by in corpus (11)

• On Classification of Models of Large Local-Type Non-Gaussianity
• Gravitational Wave Background and Non-Gaussianity as a Probe of the Curvaton Scenario
• Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations
• Negative spectral index of $f_{NL}$ in the axion-type curvaton model
• Isocurvature Perturbations and Non-Gaussianity of Gravitationally Produced Nonthermal Dark Matter
• G-Curvaton
• The trispectrum in ghost inflation
• Constraining isocurvature perturbations with the 21cm emission from minihaloes
• Fermionic Isocurvature Perturbations
• Affleck-Dine baryogenesis with modulated reheating
• Manifestly gauge invariant theory of the nonlinear cosmological perturbations in the leading order of the gradient expansion