https://doi.org/10.1140/epjc/s10052-012-2198-4
Regular Article - Theoretical Physics
Cosmological perturbations in SFT inspired non-local scalar field models
1
Theoretische Natuurkunde, Vrije Universiteit Brussel and The International Solvay Institutes, Pleinlaan 2, 1050, Brussels, Belgium
2
Instituto de Ciencias del Espacio (ICE/CSIC) and Institut d’Estudis Espacials de Catalunya (IEEC), Facultat de Ciencies, Campus UAB, Torre C5-Par-2a pl, 08193, Bellaterra, Barcelona, Spain
3
Theoretical High Energy Physics Division, Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Leninskie Gory 1, 119991, Moscow, Russia
* e-mail: svernov@theory.sinp.msu.ru
Received:
23
July
2012
Revised:
26
September
2012
Published online:
31
October
2012
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. We also show that vector and tensor perturbations are absent in this set-up.
© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica, 2012