Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-09-11
Phys.Lett. B546 (2002) 112-118
Physics
High Energy Physics
High Energy Physics - Theory
12 pages, LaTeX, to appear in Physics Letters B
Scientific paper
10.1016/S0370-2693(02)02635-7
A quadratic semiclassical theory, regarding the interaction of gravity with a massive scalar quantum field, is considered in view of the renormalizable energy-momentum tensor in a multi-dimensional curved spacetime. According to it, a self-consistent coupling between the square curvature term R^{2} and the quantum field \Phi should be introduced in order to yield the "correct" renormalizable energy-momentum tensor in quadratic gravity theories. The subsequent interaction discards any higher-order derivative terms from the gravitational field equations, but, in the expence, it introduces a geometric source term in the wave equation for the quantum field. Unlike the conformal coupling case (R\Phi ^{2}), this term does not represent an additional "mass" and, therefore, the quantum field interacts with gravity not only through its mass (or energy) content (~\Phi ^{2}), but also, in a more generic way (R^{2}\Phi). Within this context, we propose a general method to obtain mode-solutions for the quantum field, by means of the associated Green's function in an anisotropic six-dimensional background.
Kleidis Kostas
Kuiroukidis Apostolos
Papadopoulos Demetrios B.
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