Non-Adiabatic Perturbations from Single-Field Inflation

Details Non-Adiabatic Perturbations from Single-Field Inflation Non-Adiabatic Perturbations from Single-Field Inflation

2003-12-16

arxiv.org/abs/astro-ph/0312389v2

Astronomy and Astrophysics

Astrophysics

13 pages, 1 figure; uses RevTeX4.v2: Note in proof and references added

Scientific paper

If the inflaton decays into several components during reheating, and if the corresponding decay rates are functions of spacetime-dependent quantities, it is possible to generate entropy perturbations after a stage of single-field inflation. In this paper, I present a simple toy example that illustrates this possibility. In the example, the decay rates of the inflaton into ``matter'' and ``radiation'' are different functions of the total energy density. In particular cases, one can exactly solve the equations of motion both for background and perturbations in the long-wavelength limit, and show that entropy perturbations do indeed arise. Beyond these specific examples, I attempt to identify what are the essential ingredients responsible for the generation of entropy perturbations after single-field inflation, and to what extent these elements are expected to be present in realistic models.

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