2019/05/27 by Spiros Cotsakis, John Miritzis, Koralia Tzanni
Physics and Astronomy · #Advanced Differential Geometry Research #Black Holes and Theoretical Physics #Cosmological model #Cosmology #Cosmology and Gravitation Theories #Gravitational wave #Scalar (mathematics) #Scalar field #Simple (philosophy) #Term (time) #gr-qc
paper · pdf · doi:10.1142/s0217751x19500921
published as International Journal of Modern Physics A Vol. 34 (2019) 1950092 · 13 pages, 2 figures. To appear in IJMPA
arxiv created 2019/05/27 · openalex created_date 2019/05/29 · arxiv updated 2019/06/17 · openalex publication_date 2019/06/20 · openalex updated_date 2026/08/05
We consider theories of gravity that include many coupled scalar fields with arbitrary couplings, in the geometric framework of wave maps. We examine the possibility of obtaining acceptable cosmological solutions without the inclusion of a potential term to the scalar fields. To illustrate the theory, we study two simple models and compare their solutions to those in General Relativity. We also address the issue of the conditions that must be satisfied by the wave maps for an accelerated phase of the Universe.