2013/06/30 by Gianluca Calcagni, Leonardo Modesto, Piero Nicolini
Physics and Astronomy · #Action (physics) #Black Holes and Theoretical Physics #Class (philosophy) #Cosmology #Cosmology and Gravitation Theories #Gravitation #Gravitational wave #Inflation (cosmology) #Inflaton #Quantum Electrodynamics and Casimir Effect #Scale (ratio) #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1140/epjc/s10052-014-2999-8
published as Eur. Phys. J. C 74, 2999 (2014) · 13 pages, 7 multiple figures. v2: presentation improved, typos corrected, results unchanged
openalex publication_date 2014/08/01 · arxiv created 2014/08/24 · arxiv updated 2014/08/26 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05
Recently, evidence has been collected that a class of gravitational theories with certain non-local operators is renormalizable. We consider one such model which, at the linear perturbative level, reproduces the effective non-local action for the light modes of bosonic closed string-field theory. Using the property of asymptotic freedom in the ultraviolet and fixing the classical behavior of the scale factor at late times, an algorithm is proposed to find general homogeneous cosmological solutions valid both at early and late times. Imposing a power-law classical limit, these solutions (including anisotropic ones) display a bounce, instead of a big-bang singularity, and super-accelerate near the bounce even in the absence of an inflaton or phantom field.