Adiabatic CMB perturbations in pre - big bang string cosmology

By K. Enqvist, M. Sloth. 2001

791 citations recorded by the source corpus.

Abstract We consider the pre-Big-Bang scenario with a massive axion field which starts to dominate energy density when oscillating in an instanton-induced potential and subsequently reheats the universe as it decays into photons, thus creating adiabatic CMB perturbations. We find that the fluctuations in the axion field can give rise to a nearly flat spectrum of adiabatic perturbations with a spectral tilt Δn in the range −0.1≲ Δn ≲1.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c2818115dec01f47c497bb099bf53b3632e4aa5b

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Citations in the corpus

Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “The curvaton is a light scalar field that acquires scale-invariant fluctuations during inflation and decays after inflation but well before nucleosynthesis (Mollerach 1990; Moroi and Takahashi 2001; Lyth and Wands 2002; Enqvist and Sloth 2002).”
Planck2018 results (2018, background): “Once fully (or almost fully) dominating the energy density of the Universe, this curvaton field decays either to CDM or to other species (Mollerach 1990; Linde & Mukhanov 1997; Enqvist & Sloth 2002; Moroi & Takahashi 2001; Lyth & Wands 2002; Bartolo & Liddle 2002; Lyth et al. 2003).”
Inflation and String Theory (2014, background): “For example, variations of blow-up inflation have been proposed [563] that allow for large local non-Gaussianity via the curvaton mechanism [131,132,173,543]: f loc NL ∼ O(few)×10.”
Review of local non-Gaussianity from multi-field inflation (2010, background): “This is the basis of the curvaton scenario [55–59] which liberates the inflaton field from being required to generate the observed spectrum of perturbations (although there is instead an upper bound on their allowed magnitude).”