Gravitational modulated reheating and non-Gaussianity in Supergravity R^2 inflation

Abstract

Reheating after R^2 inflation proceeds through gravitational particle production of conformally noninvariant fields. We argue that the nonvanishing expectation value of flat directions generic in supersymmetric theories break conformal invariance of the fields coupled to them in a position-dependent manner due to quantum fluctuations. As a result modulated reheating can occur after the supergravity R^2-inflation. The resultant curvature fluctuation is a mixture of the one produced during inflation and that produced by modulated reheating. The spectral index takes a value between n_s=0.960 and 0.983, the nonlinearity parameter of the local-type non-Gaussianity can be f_nl\sim \pm 10, and the tensor-to-scalar ratio is r \le 4\times 10^{-3}.

18 pages no figure. A comment on SM Higgs inflation is added. References are added. Typos are corrected. To be published in PRD

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Cited by in corpus (15)

• On the Starobinsky Model of Inflation from Supergravity
• Standard Model Background of the Cosmological Collider
• On the Supersymmetric Completion of $R+R^2$ Gravity and Cosmology
• Super-renormalizable or finite completion of the Starobinsky theory
• Modified Supergravity and Early Universe: the Meeting Point of Cosmology and High-Energy Physics
• Old-minimal supergravity models of inflation
• Multi-disformal invariance of nonlinear primordial perturbations
• Topological inflation from the Starobinsky model in supergravity
• Planck constraints on inflation in auxiliary vector modified $f(R)$ theories
• Starobinsky Model in N=2 Supergravity
• No quasi-stable scalaron lump forms after $R^2$ inflation
• Multi-field formulation of gravitational particle production after inflation
• On the supersymmetrization of inflation in f(R) gravity
• Probing the BSM physics with CMB precision cosmology: an application to supersymmetry
• Stability investigations of de Sitter inflationary solutions in power-law extensions of the Starobinsky model