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Trapping effects in inflation: blue spectrum at small scales
- Publication Year :
- 2015
- Publisher :
- arXiv, 2015.
-
Abstract
- We consider the inflationary model in which the inflaton $\phi$ couples to another scalar field $\chi$ via the interaction $g^2(\phi-\phi_0)^2\chi^2$ with a small coupling constant $g$ ($g^2 \sim 10^{-7}$). We assume that there is a sequence of "trapping points" $\phi_{0i}$ along the inflationary trajectory where particles of $\chi$-field become massless and are rather effectively produced. We calculate the power spectrum of inflaton field fluctuations originated from a backreaction of $\chi$-particles produced, using the Schwinger's "in-in" formalism. We show that the primary curvature power spectrum produced by these backreaction effects is blue, which leads to a strong overproduction of primordial black holes (PBHs) in subsequent radiation era.<br />Comment: v2: 14 pages, 5 figures, version accepted by Phys. Rev. D
- Subjects :
- Physics
Coupling constant
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
010308 nuclear & particles physics
Spectral density
FOS: Physical sciences
Primordial black hole
Trapping
Astrophysics::Cosmology and Extragalactic Astrophysics
Inflaton
01 natural sciences
Massless particle
High Energy Physics - Phenomenology
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology (hep-ph)
Quantum mechanics
0103 physical sciences
Back-reaction
010306 general physics
Scalar field
Mathematical physics
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....264ff869f939e9f2e56ab333b7eb0d53
- Full Text :
- https://doi.org/10.48550/arxiv.1511.06175