Non-adiabatic primordial fluctuations

Details Non-adiabatic primordial fluctuations Non-adiabatic primordial fluctuations

2009-11-10

arxiv.org/abs/0911.1907v2

Class.Quant.Grav.28:105008,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

11 pages

Scientific paper

10.1088/0264-9381/28/10/105008

We consider general mixtures of isocurvature and adiabatic cosmological perturbations. With a minimal assumption set consisting of the linearized Einstein equations and a primordial perfect fluid we derive the second-order action and its curvature variables. We also allow for varying equation of state and speed of sound profiles. The derivation is therefore carried out at the same level of generality that has been achieved for adiabatic modes before. As a result we find a new conserved super-horizon quantity and relate it to the adiabatically conserved curvature perturbation. Finally we demonstrate how the formalism can be applied by considering a Chaplygin gas-like primordial matter model, finding two scale-invariant solutions for structure formation.

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