Cosmological perturbations in SFT inspired non-local scalar field models
arXiv:0903.5176 · doi:10.1140/epjc/s10052-012-2198-4
Abstract
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.
21 pages, no figures, v3: presentation improved, results unchanged, references added