2014/09/30 by Thiago R. P. Caramês, Mahamadou H. Daouda, Júlio C. Fabris +3 · 1 citation
Physics and Astronomy · #gr-qc #astro-ph.CO #hep-th
paper · pdf · doi:10.1140/epjc/s10052-014-3145-3
published as Eur. Phys. J. C74 (2014) 3145 · 17 pages, 3 figures
arxiv created 2014/10/13 · arxiv updated 2014/11/27
We formulate a theory combining the principles of a scalar-tensor gravity and Rastall's proposal of a violation of the usual conservation laws. We obtain a scalar-tensor theory with two parameters ω and λ, the latter quantifying the violation of the usual conservation laws. The only exact spherically symmetric solution is that of Robinson-Bertotti besides Schwarzschild solution. A PPN analysis reveals that General Relativity results are reproduced when λ= 0. The cosmological case displays a possibility of deceleration/acceleration or acceleration/deceleration transitions during the matter dominated phase depending on the values of the free parameters.