Duality in cosmological perturbation theory
نویسندگان
چکیده
منابع مشابه
Duality in Cosmological Perturbation Theory
Cosmological perturbation equations derived from low-energy effective actions are shown to be invariant under a duality transformation reminiscent of electric-magnetic, strong-weak coupling, S-duality. A manifestly dualityinvariant approximation for perturbations far outside the horizon is introduced, and it is argued to be useful even during a high curvature epoch. Duality manifests itself thr...
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Duality is applied to perturbation theory by deriving, given a series solution in a small parameter, the dual one expressed as a series having as a development parameter the inverse of the same parameter considered as large. Clues for a dual simmetry in perturbation theory are given. The method is applied in quantum mechanics to the Rayleigh-Schrödinger perturbation theory and to time-dependent...
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This is a review on cosmological perturbation theory. After an introduction, it presents the problem of gauge transformation. Gauge invariant variables are introduced and the Einstein and conservation equations are written in terms of these variables. Some examples, especially perfect fluids and scalar fields are presented in detail. The generation of perturbations during inflation is studied. ...
متن کاملRemark on the Theory of Cosmological Perturbation
It is generally predicted that there exists non-vanishing power spectrum for the wavenumbers outside the Hubble radius in the inflationary scenario. The power spectrums differ dramatically for these wavenumbers in different gauges, so we must adopt a proper power spectrum to calculate the predictions of the cosmological model. In this paper I try to show that the power spectrum defined in the S...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1998
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(98)00576-0