Moduli-Space Approximation for BPS Brane-Worlds
Gonzalo A. Palma, Anne-Christine Davis (DAMTP, University of, Cambridge)
TL;DR
This paper derives an effective four-dimensional bi-scalar tensor gravity theory for BPS branes with a bulk scalar, incorporating matter and supersymmetry breaking, and explores scalar stabilization and observational constraints.
Contribution
It develops a moduli-space approximation for BPS branes with a bulk scalar, resulting in a novel bi-scalar tensor gravity model with natural scalar stabilization.
Findings
Scalar degrees of freedom can be stabilized without extra mechanisms.
The effective theory is a bi-scalar tensor gravity model.
Observational constraints limit the shape of the BPS potential.
Abstract
We develop the moduli-space approximation for the low energy regime of BPS-branes with a bulk scalar field to obtain an effective four-dimensional action describing the system. An arbitrary BPS potential is used and account is taken of the presence of matter in the branes and small supersymmetry breaking terms. The resulting effective theory is a bi-scalar tensor theory of gravity. In this theory, the scalar degrees of freedom can be stabilized naturally without the introduction of additional mechanisms other than the appropriate BPS potential. We place observational constraints on the shape of the potential and the global configuration of branes.
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