Trapping effects in inflation: blue spectrum at small scales
| Autor: | Edgar Bugaev, Peter Klimai |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
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 |
| DOI: | 10.48550/arxiv.1511.06175 |
| Popis: | 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. Comment: v2: 14 pages, 5 figures, version accepted by Phys. Rev. D |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|