Dilaton assisted two-field inflation from no-scale supergravity

Abstract

We present a two-field inflation model where inflaton field has a non-canonical kinetic term due to the presence of a dilaton field. It is a two-parameter generalization of one-parameter Brans-Dicke gravity in the Einstein frame. We show that in such an inflation model the quartic and quadratic inflaton potentials, which are otherwise ruled out by the present Planck-{\it Keck}/BICEP2 data, yield scalar spectral index and tensor-to-scalar ratio in accordance with the present data. Such a model yield tensor-to-scalar ratio of the order of $10^{-2}$ which is within the reach of $B-$mode experiments like {\it Keck}/BICEP3, CMBPol and thus can be put to test in the near future. This model yields negligible non-Gaussianity and no isocurvature perturbations upto slow-roll approximation. Finally, we show that such a model can be realised in the realm of no-scale supergravity.

7 pages, 8 figures, Matches with the journal version to appear in Phys. Rev. D. Figures updated

References in corpus (8)

• The Standard Model Higgs boson as the inflaton
• Unitarizing Higgs Inflation
• The Imaginary Starobinsky Model
• A No-Scale Inflationary Model to Fit Them All
• Two-Field Analysis of No-Scale Supergravity Inflation
• Is Imaginary Starobinsky Model Real?
• Marginally Deformed Starobinsky Gravity
• Power law Starobinsky model of inflation from no-scale SUGRA

Cited by in corpus (5)

• Resurrecting Quadratic Inflation with a non-minimal coupling to gravity
• Constraining Barrow entropy-based Cosmology with power-law inflation
• Starobinsky Inflation: From Non-SUSY To SUGRA Realizations
• Testing theories of Gravity and Supergravity with inflation and observations of the cosmic microwave background
• Supergravity Model of Inflation and Explaining IceCube HESE Data via PeV Dark Matter Decay