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Title: D-term inflation and leptogenesis by a right-handed sneutrino

Abstract

We discuss a D-term inflation scenario where a right-handed sneutrino can be an inflaton field leading to a viable inflation and leptogenesis, with a minimal form of Kaehler potential. The decay of an inflaton sneutrino can nonthermally create large enough lepton asymmetry. Its entropy production is also big enough to ameliorate the gravitino problem caused by too high a reheating temperature from the decay of a symmetry breaking field.

Authors:
 [1];  [2]
  1. Particle Astrophysics Center, Fermilab, Batavia, Illinois 60510 (United States)
  2. Research Center for the Early Universe (RESCEU), Graduate School of Science, University of Tokyo, Tokyo, 113-0033 (Japan)
Publication Date:
OSTI Identifier:
20776724
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevD.73.043507; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; DECAY; ENTROPY; INFLATIONARY UNIVERSE; LEPTONS; POTENTIALS; QUANTUM FIELD THEORY; SPARTICLES; SYMMETRY BREAKING

Citation Formats

Kadota, Kenji, and Yokoyama, J. D-term inflation and leptogenesis by a right-handed sneutrino. United States: N. p., 2006. Web. doi:10.1103/PhysRevD.73.043507.
Kadota, Kenji, & Yokoyama, J. D-term inflation and leptogenesis by a right-handed sneutrino. United States. doi:10.1103/PhysRevD.73.043507.
Kadota, Kenji, and Yokoyama, J. Wed . "D-term inflation and leptogenesis by a right-handed sneutrino". United States. doi:10.1103/PhysRevD.73.043507.
@article{osti_20776724,
title = {D-term inflation and leptogenesis by a right-handed sneutrino},
author = {Kadota, Kenji and Yokoyama, J.},
abstractNote = {We discuss a D-term inflation scenario where a right-handed sneutrino can be an inflaton field leading to a viable inflation and leptogenesis, with a minimal form of Kaehler potential. The decay of an inflaton sneutrino can nonthermally create large enough lepton asymmetry. Its entropy production is also big enough to ameliorate the gravitino problem caused by too high a reheating temperature from the decay of a symmetry breaking field.},
doi = {10.1103/PhysRevD.73.043507},
journal = {Physical Review. D, Particles Fields},
number = 4,
volume = 73,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}
  • We discuss a D-term inflation scenario where a right-handed sneutrino can be an inflaton field leading to a viable inflation and leptogenesis, with a minimal form of Kaehler potential. The decay of an inflaton sneutrino can non-thermally create large enough lepton asymmetry. Its entropy production is also big enough to ameliorate the gravitino problem caused by too high a reheating temperature from the decay of a symmetry breaking field.
  • We extend previous work on the minimal D-term inflation model modified by right-handed (RH) sneutrino fields to include additional inflaton-sector supergravity corrections and two-field inflation effects. We show that supergravity corrections simultaneously allow n{sub s} to be within 3-year Wilkinson Microwave Anisotropy Probe limits and the cosmic string contribution to the cosmic microwave background (CMB) power spectrum to be less than 5%. For gauge coupling g{<=}1, the CMB contribution from cosmic strings is predicted to be at least 1% while the spectral index is predicted to be less than 0.968 for a CMB string contribution less than 5%. Treating themore » inflaton-RH sneutrino system as a two-field inflation model, we show that the time-dependence of the RH sneutrino field strongly modifies the single-field results for values of RH sneutrino mass m{sub {phi}}>0.1H. The running spectral index is {alpha}{approx_equal}-0.0002 when m{sub {phi}}<0.1H but increases to positive values as m{sub {phi}}/H increases, with {alpha}>0.008 for m{sub {phi}}>1.0H.« less
  • Supergravity corrections due to the energy density of a right-handed sneutrino can generate a negative mass squared for the inflaton, flattening the inflaton potential and reducing the spectral index and inflaton energy density. For the case of D-term hybrid inflation, we show that the spectral index can be lowered from the conventional value n=0.98 to a value within the range favored by the latest WMAP analysis, n=0.951{sub -0.019}{sup +0.015}. The modified energy density is consistent with nonobservation of cosmic strings in the CMB if n<0.946. The WMAP lower bound on the spectral index implies that the D-term cosmic string contributionmore » may be very close present CMB limits, contributing at least 5% to the CMB multipoles.« less
  • In this paper, we consider large non-Gaussianity generated after D-term inflation in the case that the adiabatic curvature perturbation produced is dominated by a right-handed (RH) sneutrino curvaton. The cosmic string problem can also be evaded with around 10% contribution to the CMB power spectrum and the spectral index n{sub s} ≅ 1. The non-Gaussianity produced can be as large as 10 < f{sub NL} < 100 for the right-handed sneutrino mass being around m{sub Φ} = 100 GeV with the Yukawa coupling λ{sub ν} ∼ 10{sup −10}. In this case, the lightest neutrino mass is 10{sup −10} eV whichmore » favors RH sneutrino leptogenesis.« less
  • We reconsidered leptogenesis scenario from right-handed (s)neutrino produced by the decay of inflaton. Besides the well-investigated case that the neutrino decays instantaneously after the production, leptogenesis is possible if neutrino decays after it dominates the universe. In the latter case, right-handed (s)neutrino can decay either while it is relativistic or after it becomes non-relativistic. Especially, the first case has not been discussed seriously in literatures. Resultant lepton asymmetry and constraints from the gravitino problem are studied in broad parameter region, including all cases of this scenario. It is also shown how this leptogenesis scenario depends on the parameters, the inflatonmore » decay rate (the reheating temperature), the right-handed neutrino mass, the washout parameter, and the constraint from the gravitino problem. Leptogenesis from relativistic neutrino decay is interesting because both thermal and non-thermal gravitino problems can be relaxed.« less