The non-adiabatic pressure in general scalar field systems

Details The non-adiabatic pressure in general scalar field systems The non-adiabatic pressure in general scalar field systems

2008-09-20

arxiv.org/abs/0809.3518v3

Phys.Lett.B675:159-163,2009

Astronomy and Astrophysics

Astrophysics

6 pages, revtex4; v2: typos corrected, results clarified, version being submitted; v3: version accepted for publication

Scientific paper

10.1016/j.physletb.2009.04.003

We discuss the non-adiabatic or entropy perturbation, which controls the evolution of the curvature perturbation in the uniform density gauge, for a scalar field system minimally coupled to gravity with non-canonical action. We highlight the differences between the sound and the phase speed in these systems, and show that the non-adiabatic pressure perturbation vanishes in the single field case, resulting in the conservation of the curvature perturbation on large scales.

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