The Universal Kaehler Modulus in Warped Compactifications

Details The Universal Kaehler Modulus in Warped Compactifications The Universal Kaehler Modulus in Warped Compactifications

2008-10-31

arxiv.org/abs/0810.5768v2

JHEP 0901:036,2009

Physics

High Energy Physics

High Energy Physics - Theory

28 pages, 1 figure; v2. corrected typos, added refs & minor clarifications

Scientific paper

10.1088/1126-6708/2009/01/036

We construct the effective theory of the universal Kaehler modulus in warped compactifications using the Hamiltonian formulation of general relativity. The spacetime dependent 10d solution is constructed at the linear level for both the volume modulus and its axionic partner, and nontrivial cancellations of warping effects are found in the dimensional reduction. Our main result is that the Kaehler potential is not corrected by warping, up to an overall shift in the background value of the volume modulus. We extend the analysis beyond the linearized approximation by computing the fully backreacted 10d metric corresponding to a finite volume modulus fluctuation. Also, we discuss the behavior of the modulus in strongly warped regions and show that there are no mixings with light Kaluza-Klein modes. These results are important for the phenomenology and cosmology of flux compactifications.

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