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Perturbations in k-inflation | | Jaume Garriga
; V.F. Mukhanov
; | | Date: |
26 Apr 1999 | | Journal: | Phys.Lett. B458 (1999) 219-225 | | Subject: | hep-th astro-ph gr-qc | | Abstract: | We extend the theory of cosmological perturbations to the case when the ``matter’’ Lagrangian is an arbitrary function of the scalar field and its first derivatives. In particular, this extension provides a unified description of known cases such as the usual scalar field and the hydrodynamical perfect fluid. In addition, it applies to the recently proposed k-inflation, which is driven by non-minimal kinetic terms in the Lagrangian. The spectrum of quantum fluctuations for slow-roll and power law k-inflation is calculated. We find, for instance, that the usual ``consistency relation’’ between the tensor spectral index and the relative amplitude of scalar and tensor perturbations is modified. Thus, at least in principle, k-inflation is phenomenologically distinguishable from standard inflation. | | Source: | arXiv, hep-th/9904176 | | Services: | Forum | Review | PDF | Favorites | |
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