Late-time Entropy Production from Scalar Decay and Relic Neutrino Temperature
arXiv:astro-ph/0309135 · doi:10.1103/PhysRevD.68.083519
Abstract
Entropy production from scalar decay in the era of low temperatures after neutrino decoupling will change the ratio of the relic neutrino temperature to the CMB temperature, and, hence, the value of N_eff, the effective number of neutrino species. Such scalar decay is relevant to reheating after thermal inflation, proposed to dilute massive particles, like the moduli and the gravitino, featuring in supersymmetric and string theories. The effect of such entropy production on the relic neutrino temperature ratio is calculated in a semi-analytic manner, and a recent lower bound on this ratio, obtained from the WMAP satellite and 2dF galaxy data, is used to set a lower bound of ~ 1.5 x 10^-23 Gev on the scalar decay constant, corresponding to a reheating temperature of about 3.3 Mev.
arXiv comment13 pages, to appear in PRD
References in corpus (25)
- Theories with Gauge-Mediated Supersymmetry Breaking
- MeV-scale Reheating Temperature and Thermalization of Neutrino Background
- Neutrinos in cosmology
- Model Independent Properties and Cosmological Implications of the Dilaton and Moduli Sectors of 4-d Strings
- Cosmological Implications of Dynamical Supersymmetry Breaking
- Supersymmetry Breaking in the Early Universe
- Production of massive particles during reheating
- Cosmological Constraints on Late-time Entropy Production
- Cosmology with a TeV mass GUT Higgs
- Nonequilibrium Corrections to the Spectra of Massless Neutrinos in the Early Universe
- Neutrino decoupling in the early Universe
- Neutrino masses and the number of neutrino species from WMAP and 2dFGRS
- Solving the Cosmological Moduli Problem with Weak Scale Inflation
- Precision Prediction for the Big-Bang Abundance of Primordial Helium
- Radiative decay of a massive particle and the non-thermal process in primordial nucleosynthesis
- The Cosmological Moduli Problem, Supersymmetry Breaking and Stability in Postinflationary Cosmology
- Primordial nucleosynthesis and hadronic decay of a massive particle with a relatively short lifetime
- The Impact of an Extra Background of Relativistic Particles on the Cosmological Parameters derived from Microwave Background Anisotropies
- Precision Detection of the Cosmic Neutrino Background
- Cosmological Moduli Problem and Thermal Inflation Models
- Cosmological Moduli Problem in Gauge-mediated Supersymmetry Breaking Theories
- Constraint on Cosmic Density of the String Moduli Field in Gauge-Mediated Supersymmetry-Breaking Theories
- Cosmological Constraint on the String Dilaton in Gauge-mediated Supersymmetry Breaking Theories
- On the Moduli Problem and Baryogenesis in Gauge-mediated SUSY Breaking Models
- Possible astrophysical signatures of heavy stable neutral relics in supergravity models
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- Structure formation with strongly interacting neutrinos - implications for the cosmological neutrino mass bound
- Do observations prove that cosmological neutrinos are thermally distributed?
- Leptogenesis, Gravitino Dark Matter and Entropy Production
- Dark and visible matter with broken R-parity and the axion multiplet
- Non-thermal Hot Dark Matter from Inflaton/Moduli Decay: The Momentum Distribution and Relaxing the Cosmological Mass Bound
- Cosmological neutrino entropy changes due to flavor statistical mixing