Marginally Deformed Starobinsky Gravity

Abstract

We show that quantum-induced marginal deformations of the Starobinsky gravitational action of the form $R^{2(1-\alpha )}$, with $R$ the Ricci scalar and $\alpha$ a positive parameter, smaller than one half, can account for the recent experimental observations by BICEP2 of primordial tensor modes. We also suggest natural microscopic (non) gravitational sources of these corrections and demonstrate that they lead generally to a nonzero and positive $\alpha$. Furthermore we argue, that within this framework, the tensor modes probe theories of grand unification with a large scalar field content.

arXiv comment5 pages, 1 figure, 2 columns

References in corpus (9)

• f(R) Theories Of Gravity
• BICEP2 I: Detection Of B-mode Polarization at Degree Angular Scales
• Investigating the Ultraviolet Properties of Gravity with a Wilsonian Renormalization Group Equation
• Nonlocal Cosmology
• Toward an Understanding of Foreground Emission in the BICEP2 Region
• The effective field theory treatment of quantum gravity
• The Imaginary Starobinsky Model
• Conformally flat FRW metrics
• Large N Quantum Gravity

Cited by in corpus (25)

• Inflation in scale-invariant theories of gravity
• On the covariant formalism of the effective field theory of gravity and leading order corrections
• Inflation in an effective gravitational model & asymptotic safety
• Reinterpretation of the Starobinsky model
• Deformed Starobinsky model in gravity's rainbow
• Disentangling the $f(R)$ - Duality
• Inflation from Asymptotically Safe Theories
• Cosmic evolution of the logarithmic f(R) model and the dS swampland conjecture
• f(R) and Brans-Dicke Theories and the Swampland
• The Effective Theory of Quantum Black Holes
• Inflation from $f(R)$ theories in gravity's rainbow
• Cosmological evolution of thermal relic particles in $f(R)$ gravity
• Saddle point inflation from higher order corrections to Higgs/Starobinsky inflation
• Smeared Mass Source Wormholes in Modified $f(R)$ Gravity with the Lorentzian Density Distribution Function
• Is asymptotically safe inflation eternal?
• Gravitational waves in Modified Gauss-Bonnet Gravity
• Dilaton assisted two-field inflation from no-scale supergravity
• Testing theories of Gravity and Supergravity with inflation and observations of the cosmic microwave background
• Multi-phase induced inflation in theories with non-minimal coupling to gravity
• A Unified Universe
• Refined Swampland conjecture in deformed Starobinsky gravity
• Power law $\alpha$-Starobinsky inflation
• Gravity Rainbow Effects on Higher Curvature Modification of R2 inflation
• Observational Constraints on Asymptotic Safety Inflation in Gravity Rainbow
• Theoretical and observational constraints on early dark energy in $F(R)$ gravity