Inflation and Dark Energy from a Scalar Field in Supergravity

Mar 25, 2015
8 pages
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20132014201501
Abstract: (arXiv)
In this paper we present a model for accelerated expansion of the universe, both during inflation and the present stage of the expansion, from four dimensional N=1\mathcal{N}=1 supergravity. We evaluate the tensor-to-scalar ratio (r0.00034r\approx 0.00034), the scalar spectral index (ns0.970n_s\approx 0.970) and the running spetral index (dns/dk6×105dn_s/dk\approx -6\times10^{-5}), and we notice that these parameters are in agreement with Planck+WP+lensing data and with BICEP2/Keck and Planck joint analysis, at 95%95\% CL. The number of e-folds is 5050 or higher. The reheating period has an associated temperature TR1012T_R\sim10^{12} GeV, which agrees with the one required by thermal leptogenesis. Regarding the scalar field as dark energy, the autonomous system for it in the presence of a barotropic fluid provides a stable fixed point that leads to a late-time accelerated expansion of the universe, with an equation of state that mimics the cosmological constant (wΦ0.997w_\Phi\approx -0.997).
Note:
  • This paper has been withdrawn by the author due to a numerical error
  • expansion: acceleration
  • field theory: scalar
  • power spectrum: scalar
  • fixed point: stability
  • leptogenesis: thermal
  • supergravity: 1
  • dark energy
  • inflation
  • cosmological constant