New Actions for Modified Gravity and Supergravity

Abstract

We extend the f(R) gravity action by including a generic dependence upon the Weyl tensor, and further generalize it to supergravity by using the super-curvature (R) and super-Weyl (W) chiral superfields in N=1 chiral curved superspace. We argue that our (super)gravitational actions are the meaningful extensions of the phenomenological f(R) gravity and its locally supersymmetric generalization towards their UV completion and their embedding into superstring theories. The proposed actions can be used for study of cosmological perturbations and gravitational instabilities due to a nonvanishing Weyl tensor in gravity and supergravity.

15 pages, minor revision for version 2 (published version)

References in corpus (6)

• Inflation and non-minimal scalar-curvature coupling in gravity and supergravity
• Modified Supergravity and Early Universe: the Meeting Point of Cosmology and High-Energy Physics
• Chaotic inflation in F(R) supergravity
• Cosmological properties of a generic (\cal R)^2-supergravity
• Cosmological constant in F(R) supergravity
• Dark Energy in Modified Supergravity

Cited by in corpus (7)

• Inflation in Supergravity with a Single Chiral Superfield
• Old-minimal supergravity models of inflation
• Reheating processes after Starobinsky inflation in old-minimal supergravity
• Starobinsky Model in N=2 Supergravity
• Towards a formulation of $f(R)$ supergravity
• Deforming the Starobinsky model in ghost-free higher derivative supergravities
• Supersymmetry, Cosmological Constant and Inflation: Towards a fundamental cosmic picture via "running vacuum"