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Cosmological perturbations in SFT inspired non-local scalar field models

We study cosmological perturbations in models with a single non-local scalar field originating from the string field theory description of the rolling tachyon dynamics. We construct the equation for the energy density perturbations of the non-local scalar field and explicitly prove that for the free field it is identical to a system of local cosmological perturbation equations in a particular model with multiple (maybe infinitely many) local free scalar fields.

preprint2012arXivOpen access
Alexey S. KoshelevSergey Yu. Vernov
astro-ph.COgr-qchep-th
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Alexey S. KoshelevSergey Yu. Vernov

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