Production of non-gaussianities in a bouncing phase
arXiv:1403.7958 · doi:10.1088/1475-7516/2014/07/010
Abstract
We compute the level of non-gaussianities produced by a cosmological bouncing phase in the minimal non-singular setup that lies within the context of General Relativity when the matter content consists of a simple scalar field with a standard kinetic term. Such a bouncing phase is obtained by requiring that the spatial sections of the background spacetime be positively curved. We restrict attention to the close vicinity of the bounce by Taylor expanding the scale factor, the scalar field and its potential in powers of the conformal time around the bounce. We find that possibly large non-gaussianities are generically produced at the bounce itself and also discuss which shapes of non-gaussianities are mostly likely to be produced.
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References in corpus (18)
- The Effective Field Theory of Inflation
- Observational Signatures and Non-Gaussianities of General Single Field Inflation
- Primordial Non-Gaussianities from Inflation Models
- G-inflation: inflation driven by the Galileon field
- Enhanced Non-Gaussianity from Excited Initial States
- Generating Ekpyrotic Curvature Perturbations Before the Big Bang
- Cosmology without inflation
- Non-Gaussianity in a Matter Bounce
- Anisotropy in a Nonsingular Bounce
- A non inflationary model with scale invariant cosmological perturbations
- Scalar and Vector Perturbations in Quantum Cosmological Backgrounds
- A Model Of Inflationary Cosmology Without Singularity
- A Note on Calm Excited States of Inflation
- Sachs-Wolfe at second order: the CMB bispectrum on large angular scales
- A classical bounce: constraints and consequences
- Primordial Non-Gaussianities from the Trispectra in Multiple Field Inflationary Models
- Testing gravity with non-Gaussianity
- On non-linear CMB temperature anisotropy from gravitational perturbations
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- Cuscuton Bounce Beyond the Linear Regime: Bispectrum and Strong Coupling Constraints
- How Much NEC Breaking Can the Universe Endure?
- Constraining matter-bounce scenario from scalar-induced vector perturbations