Breaking of Spatial Diffeomorphism Invariance, Inflation and the Spectrum of Cosmological Perturbations

Abstract

Standard inflationary models yield a characteristic signature of a primordial power spectrum with a red tensor and scalar tilt. Nevertheless, Cannone et al recently suggested that, by breaking the assumption of spatial diffeomorphism invariance in the context of the effective field theory of inflation, a blue tensor spectrum can be achieved without violating the Null Energy Condition. In this context, we explore in which cases a blue tensor tilt can be obtained along with a red tilt in the scalar spectrum. Ultimately, we analyze under which conditions this model can reproduce the specific consistency relation of String Gas Cosmology.

6 pages

References in corpus (10)

• The Effective Field Theory of Inflation
• Causality, Analyticity and an IR Obstruction to UV Completion
• A Joint Analysis of BICEP2/Keck Array and Planck Data
• G-inflation: inflation driven by the Galileon field
• Tensor Modes from a Primordial Hagedorn Phase of String Cosmology
• String Gas Cosmology and Structure Formation
• Generalised tensor fluctuations and inflation
• Closed String Thermodynamics and a Blue Tensor Spectrum
• Breaking discrete symmetries in the effective field theory of inflation
• Inflation and Alternatives with Blue Tensor Spectra

Cited by in corpus (10)

• Challenges and Opportunities of Gravitational Wave Searches at MHz to GHz Frequencies
• Primordial gravitational waves from NANOGrav: a broken power-law approach
• Distinctive signatures of space-time diffeomorphism breaking in EFT of inflation
• Primordial black holes as a novel probe of primordial gravitational waves. II: Detailed analysis
• Challenges and Opportunities of Gravitational Wave Searches above 10 kHz
• Higher derivative scalar-tensor theory through a non-dynamical scalar field
• Constraining the Break of Spatial Diffeomorphism Invariance with Planck Data
• Self-gravitating $\Lambda$-media
• Charged Lifshitz black holes from general covariance breaking
• Gravitational waves in a cyclic Universe: resilience through cycles and vacuum state