Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-09-21
Class.Quant.Grav.28:195013,2011
Physics
High Energy Physics
High Energy Physics - Theory
33 pages. v2: Added references, comments. v3: Updated discussion, added references
Scientific paper
10.1088/0264-9381/28/19/195013
In general warped compactifications, non-trivial backgrounds for the warp factor and the dilaton break $D$-dimensional diffeomorphism invariance, so that dilaton fluctuations can be gauged away completely and eaten by the metric. More specifically, the warped volume modulus and the dilaton are not independent, but combine into a single gauge-invariant degree of freedom in the lower dimensional effective theory, the warped breathing mode. This occurs for all strengths of the warping, even the weakly warped limit. This warped breathing mode appears as a natural zero mode deformation of backgrounds sourced by p-branes, and affects the identification of the independent degrees of freedom of flux compactifications.
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