6 research outputs found
The N=4 effective action of type IIA supergravity compactified on SU(2)-structure manifolds
We study compactifications of type IIA supergravity on six-dimensional
manifolds with SU(2) structure and compute the low-energy effective action in
terms of the non-trivial intrinsic torsion. The consistency with gauged N=4
supergravity is established and the gauge group is determined. Depending on the
structure of the intrinsic torsion, antisymmetric tensor fields can become
massive.Comment: 29 pages, latex, v2: minor corrections, added references, published
versio
Heterotic compactifications on SU(2)-structure backgrounds
In this paper we study the reduction of heterotic string theory on
SU(2)-structure backgrounds. We compute the bosonic low-energy gauged N=2
supergravity specified by the Killing vectors corresponding to the gauged
isometries. We check that the obtained Lagrangian is consistent with the one of
N=2 local supersymmetry. We also determine the Killing prepotentials.Comment: reference added, corrected typos and some factor
Finding all flux vacua in an explicit example
We explicitly construct all supersymmetric flux vacua of a particular
Calabi-Yau compactification of type IIB string theory for a small number of
flux carrying cycles and a given D3-brane tadpole. The analysis is performed in
the large complex structure region by using the polynomial homotopy
continuation method, which allows to find all stationary points of the
polynomial equations that characterize the supersymmetric vacuum solutions. The
number of vacua as a function of the D3 tadpole is in agreement with
statistical studies in the literature. We calculate the available tuning of the
cosmological constant from fluxes and extrapolate to scenarios with a larger
number of flux carrying cycles. We also verify the range of scales for the
moduli and gravitino masses recently found for a single explicit flux choice
giving a K\"ahler uplifted de Sitter vacuum in the same construction.Comment: LaTeX, 1-32 pages, 8 figure