Cosmological perturbations of a perfect fluid and noncommutative variables
arXiv:0908.3439 · doi:10.1103/PhysRevD.81.063527
Abstract
We describe the linear cosmological perturbations of a perfect fluid at the level of an action, providing thus an alternative to the standard approach based only on the equations of motion. This action is suited not only to perfect fluids with a barotropic equation of state, but also to those for which the pressure depends on two thermodynamical variables. By quantizing the system we find that (1) some perturbation fields exhibit a noncommutativity quite analogous to the one observed for a charged particle moving in a strong magnetic field, (2) local curvature and pressure perturbations cannot be measured simultaneously, (3) ghosts appear if the null energy condition is violated.
4 pages, uses RevTeX. Title modified, references and comments added.
References in corpus (6)
- Vacuum structure for scalar cosmological perturbations in Modified Gravity Models
- Action approach to cosmological perturbations: the 2nd order metric in matter dominance
- Quantum FRW cosmological solutions in the presence of Chaplygin gas and perfect fluid
- Gravitational wave background in perfect fluid quantum cosmologies
- Stephani-Schutz quantum cosmology
- Scalar mode propagation in modified gravity with a scalar field
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