Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-05-21
Phys.Rev.D76:126001,2007
Physics
High Energy Physics
High Energy Physics - Theory
20 pages, 3 figures. v2: references addded, typos corrected, discussion improved; v3: matches the published version
Scientific paper
10.1103/PhysRevD.76.126001
An analytic approach to phenomenological models inspired by cubic string field theory is introduced and applied to some examples. We study a class of actions for a minimally coupled, homogeneous scalar field whose energy density contains infinitely many time derivatives. These nonlocal systems are systematically localized and an algorithm to find cosmological solutions of the dynamical equations is provided. Our formalism is able to define the nonlocal field in regions of the parameter space which are inaccessible by standard methods. Also, problems related to nonlocality are reinterpreted under a novel perspective and naturally overcome. We consider phenomenological models living on a Friedmann-Robertson-Walker background with power-law scale factor, both in four dimensions and on a high-energy braneworld. The quest for solutions unravels general features of nonlocal dynamics indicating several future directions of investigation.
Calcagni Gianluca
Montobbio Michele
Nardelli Giuseppe
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