2020/03/31 by Tsutomu Kobayashi · 4 citations
Physics and Astronomy · #gr-qc
paper · pdf · doi:10.1088/1475-7516/2020/07/013
v2: version to appear in JCAP, 7 pages
arxiv created 2020/07/06 · arxiv updated 2020/07/22
We reformulate the recently proposed regularized version of Lovelock gravity in four dimensions as a scalar-tensor theory. By promoting the warp factor of the internal space to a scalar degree of freedom by means of Kaluza-Klein reduction, we show that regularized Lovelock gravity can be described effectively by a certain subclass of the Horndeski theory. Cosmological aspects of this particular scalar-tensor theory are studied. It is found that the background with a scalar charge is generically allowed. The consequences of this scalar charge are briefly discussed.