http://arxiv.org/abs/1905.08177
In the present paper we discuss on the issue that arises when one tries to classify the gravitational theories into scalar-tensor theories or general relativity with a scalar field non-minimally coupled to matter. Despite that the issue might seem like a trivial one, some confusion might arise when dealing with higher-derivatives Horndeski theories that at first sight do not look like scalar-tensor theories. To further complicate things, the discussion on the physical equivalence of the different conformal frames in which a given scalar-tensor theory may be formulated, makes even harder to achieve a correct classification.
I. Quiros, F. Horta-Rangel, R. Arcia, et. al.
Tue, 21 May 19
21/71
Comments: 27 pages, no figures
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