Breaking of Spatial Diffeomorphism Invariance, Inflation and the Spectrum of Cosmological Perturbations
| Autor: | Robert Brandenberger, Leila L. Graef |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
High Energy Physics - Theory
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Scalar (mathematics) FOS: Physical sciences Context (language use) Astrophysics::Cosmology and Extragalactic Astrophysics General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences String (physics) General Relativity and Quantum Cosmology Cosmology 0103 physical sciences Energy condition Effective field theory Tensor 010306 general physics Astrophysics::Galaxy Astrophysics Mathematical physics Physics Inflation (cosmology) 010308 nuclear & particles physics Astronomy and Astrophysics 16. Peace & justice High Energy Physics - Theory (hep-th) Astrophysics - Cosmology and Nongalactic Astrophysics |
| DOI: | 10.48550/arxiv.1506.00896 |
| Popis: | 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. Comment: 6 pages |
| Databáze: | OpenAIRE |
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