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- W2034852517 abstract "We consider the Einstein equations within the Dirac-Born-Infield (DBI) scenario for a spatially flat Friedmann-Robertson-Walker (FRW) spacetime without a cosmological constant. We derive the inflationary scenario by applying the symmetry transformations which preserve the form of the Friedmann and conservation equations. These form invariance transformations generate a symmetry group parametrized by the Lorentz factor $ensuremath{gamma}$. We explicitly obtain an inflationary scenario by the cooperative effect of adding energy density into the Friedmann equation. For the case of a constant Lorentz factor, and under the slow roll assumption, we find the transformation rules for the scalar and tensor power spectra of perturbations as well as their ratio under the action of the form invariance symmetry group. Within this case and due to its relevance for the inflationary paradigm, we find the general solution of the dynamical equations for a DBI field driven by an exponential potential and show a broad set of inflationary solutions. The general solution can be split into three subsets and all these behave asymptotically as a power-law solution at early and at late times." @default.
- W2034852517 created "2016-06-24" @default.
- W2034852517 creator A5011129860 @default.
- W2034852517 creator A5037572709 @default.
- W2034852517 creator A5053635230 @default.
- W2034852517 date "2011-03-07" @default.
- W2034852517 modified "2023-09-28" @default.
- W2034852517 title "Enhanced inflation in the Dirac-Born-Infeld framework" @default.
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- W2034852517 doi "https://doi.org/10.1103/physrevd.83.063505" @default.
- W2034852517 hasPublicationYear "2011" @default.
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