Affleck-Dine baryogenesis with modulated reheating

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Abstract

Modulated reheating scenario is one of the most attractive models that predict possible detections of not only the primordial non-Gaussianity but also the tensor fluctuation through future CMB observations such as the Planck satellite, the PolarBeaR and the LiteBIRD satellite experiments. We study the baryonic-isocurvature fluctuations in the Affleck-Dine baryogenesis with the modulated reheating scenario. We show that the Affleck-Dine baryogenesis can be consistent with the modulated reheating scenario with respect to the current observational constraint on the baryonic-isocurvature fluctuations.

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Equation of state and Beginning of Thermalization After Preheating

Gary Felder, Dmitry I. Podolsky, Lev Kofman … (2005)

We study the out-of-equilibrium nonlinear dynamics of fields after post-inflationary preheating. During preheating, the energy in the homogeneous inflaton is exponentially rapidly transfered into highly occupied out-of-equilibrium inhomogeneous modes, which subsequently evolve towards equilibrium. The infrared modes excited during preheating evolve towards a saturated distribution long before thermalization completes. We compute the equation of state during and immediately after preheating. It rapidly evolves towards radiation domination long before the actual thermal equilibrium is established. The exact time of this transition is a non-monotonic function of the coupling between the inflaton and the decay products, and it varies only very weakly (around 10^(-35) s) as this coupling changes over several orders of magnitude. This result is applied to refine the relation between the number of efoldings N and the physical wavelength of perturbations generated during inflation. We also discuss the implications for the theory of modulated perturbations from preheating. We finally argue that many questions of the thermal history of the universe should be addressed in terms of pre-thermalization, illustrating this point with a calculation of perturbative production of gravitinos immediately after chaotic inflation. We also highlight the effects of three-legs inflaton interactions on the dynamics of preheating and thermalization in an expanding universe.

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Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations

Tomo Takahashi, Shuichiro Yokoyama, Masahide Yamaguchi (2009)

We investigate primordial non-Gaussianity and dark matter isocurvature fluctuations in the modulated reheating and the curvaton scenarios. In these scenarios, large non-Gaussianity can be generated, on the other hand, depending on how dark matter is produced, too large isocurvature fluctuations can also arise, which is inconsistent with current observations. In this paper, we study this issue in a mixed scenario where the curvature fluctuations can also be produced from the inflaton fluctuations as well as those from a light scalar field such as the modulus and the curvaton. We show that primordial fluctuations can be highly non-Gaussian without conflicting the current constraint on isocurvature fluctuations for such mixed scenarios. However, if the constraint on isocurvature fluctuations becomes severer as expected by the Planck satellite, \(f_{\rm NL}\), a nonlinearity parameter for adiabatic fluctuations, should be very small as \(f_{\rm NL} \lesssim 3\), which would give interesting implications for the generation mechanism of dark matter. Non-Gaussianity from isocurvature fluctuations is also discussed in these scenarios.

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Light Scalars and the Generation of Density Perturbations During Preheating or Inflaton Decay

Mark Wise, Michael L. Graesser, Christian W Bauer … (2004)

Reheating after inflation can occur through inflaton decay or efficient parametric resonant production of particles from the oscillation of the inflaton. If the particles produced interact with scalars that were light during inflation, then significant super-horizon density perturbations are generated during this era. These perturbations can be highly non-Gaussian.

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Publication date Created: 09 August 2010

Publication date Updated: 2010-08-16

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DOI: 10.1088/1475-7516/2011/01/027

ArXiV ID: 1008.1450

SO-VID: 4668ef1d-4b03-4368-81ff-e75e11e1e9e7

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http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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Report No KEK-TH-1385, KEK-Cosmo-42, RESCEU-19/10

Journal reference JCAP 1101:027,2011

Comments 7 pages

Categories astro-ph.CO hep-ph hep-th

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Affleck-Dine baryogenesis with modulated reheating

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Exponential Random Graph Models

Most cited references 3

Equation of state and Beginning of Thermalization After Preheating

Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations

Light Scalars and the Generation of Density Perturbations During Preheating or Inflaton Decay

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