Gauging the scale invariance of Einstein equations: Weyl-invariant equations for gravity
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DOI: 10.1103/physrevd.111.044050
Abstract: We derive a Weyl invariant equation for Gravity by gauging the global Weyl invariance of vacuum Einstein equations. The equation is linear in the curvature and a natural generalization of Einstein equations to Weyl geometry.… read more here.
Keywords: invariance; gravity; weyl invariant; einstein equations ... See more keywords
Witten diagrams in momentum space and one graviton exchange between scalars in Weyl invariant unimodular gravity
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DOI: 10.1103/physrevd.111.066020
Abstract: We tackle head on the computation of the s-channel Witten diagram in momentum space corresponding to the exchange of a graviton between minimally coupled scalars in Weyl invariant unimodular gravity. By means of a lengthy… read more here.
Keywords: unimodular gravity; momentum space; scalars weyl; weyl invariant ... See more keywords
Gravitoelectromagnetic inflation and seeds of cosmic magnetic fields from geometrical Weyl-invariant scalar–tensor theory of gravity
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DOI: 10.1139/cjp-2018-0326
Abstract: We investigate cosmological inflationary scenarios from a gravitoelectromagnetic theory. Our work is formulated in light of a recently introduced geometrical Weyl-invariant scalar–tensor theory of gravity, where the nature of both the electromagnetic potential and the… read more here.
Keywords: weyl invariant; geometrical weyl; magnetic fields; theory ... See more keywords