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Cosmological perturbations of a perfect fluid and noncommutative variables

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De Felice, Antonio [UCL] Gérard, Jean-Marc [UCL] Suyama, Teruaki [UCL]

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.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2010
Language Anglais
Journal information "Physical Review. D, Particles, Fields, Gravitation and Cosmology" - Vol. 81, no. 6 (2010)
Peer reviewed yes
Publisher Amer Physical Soc (College Pk)
issn 1550-7998
e-issn 1089-4918
Publication status Publié
Affiliation UCL - SST/IRMP - Institut de recherche en mathématique et physique
Links
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Bibliographic reference De Felice, Antonio ; Gérard, Jean-Marc ; Suyama, Teruaki. Cosmological perturbations of a perfect fluid and noncommutative variables. In: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 81, no. 6 (2010)
Permanent URL http://hdl.handle.net/2078.1/33981