Inflaton clusters and inflaton stars
- 1 July 2020
- journal article
- research article
- Published by IOP Publishing in Journal of Cosmology and Astroparticle Physics
- Vol. 2020 (07), 030
- https://doi.org/10.1088/1475-7516/2020/07/030
Abstract
In a broad class of scenarios, inflation is followed by an extended era of matter-dominated expansion during which the inflaton condensate is nonrelativistic on subhorizon scales. During this phase density perturbations grow to the point of nonlinearity and collapse into bound structures. This epoch strongly resembles structure formation with ultra-light axion-like particles. This parallel permits us to adapt results from studies of cosmological structure formation to describe the nonlinear dynamics of this post-inflationary epoch. We show that the inflaton condensate fragments into "inflaton clusters", analogues of axion dark matter halos in present-day cosmology. Moreover, solitonic objects or "inflaton stars" can form inside these clusters, leading to density contrasts as large as 106 in the post-inflationary universe.Keywords
This publication has 46 references indexed in Scilit:
- Delayed reheating and the breakdown of coherent oscillationsJournal of Cosmology and Astroparticle Physics, 2011
- Inflation and the scale dependent spectral index: prospects and strategiesJournal of Cosmology and Astroparticle Physics, 2011
- Axion as a cold dark matter candidatePhysics Letters B, 2009
- Grand Unification Scale Primordial Black Holes: Consequences and ConstraintsPhysical Review Letters, 2009
- Primordial black holes, eternal inflation, and the inflationary parameter space after WMAP5Journal of Cosmology and Astroparticle Physics, 2008
- The Standard Model Higgs boson as the inflatonPhysics Letters B, 2008
- How long before the end of inflation were observable perturbations produced?Physical Review D, 2003
- Horizon Ratio Bound for Inflationary FluctuationsPhysical Review Letters, 2003
- Using the Schroedinger Equation to Simulate Collisionless MatterThe Astrophysical Journal, 1993
- On the possibility of Bose-star formationPhysics Letters B, 1991