222 research outputs found
Cosmological Solutions on Atiyah-Hitchin Space in Five Dimensional Einstein-Maxwell-Chern-Simons Theory
We construct non-stationary exact solutions to five dimensional
Einstein-Maxwell-Chern-Simons theory with positive cosmological constant. The
solutions are based on four-dimensional Atiyah-Hitchin space. In asymptotic
regions, the solutions approach to Gibbons-Perry-Sorkin monopole solutions. On
the other hand, near the four-dimensional bolt of Atiyah-Hitchin space, our
solutions show a bolt structure in five dimensions. The c-function for the
solutions shows monotonic increase in time, in agreement with the general
expected behaviour of c-function in asymptotically dS spacetimes.Comment: 12 pages, 3 figure
Vector-Chiral Equivalence in Null Gauged WZNW Theory
We consider the standard vector and chiral gauged WZNW models by their gauged
maximal null subgroups and show that they can be mapped to each other by a
special transformation. We give an explicit expression for the map in the case
of the classical Lie groups , , , , and note its
connection with the duality map for the Riemmanian globally symmetric spaces.Comment: 13 pages, LaTe
M-Branes on k-center Instantons
We present analytic solutions for membrane metric function based on
transverse -center instanton geometries. The membrane metric functions
depend on more than two transverse coordinates and the solutions provide
realizations of fully localized type IIA D2/D6 and NS5/D6 brane intersections.
All solutions have partial preserved supersymmetries.Comment: 22 pages, 5 figure
Resolved Conifolds in Supergravity Solutions
We construct generalized 11D supergravity solutions of fully localized
intersecting D2/D4 brane systems. These solutions are obtained by embedding
six-dimensional resolved Eguchi-Hanson conifolds lifted to M-theory. We reduce
these solutions to ten dimensions, obtaining new D-brane systems in type IIA
supergravity. We discuss the limits in which the dynamics of the D2 brane
decouples from the bulk for these solutions.Comment: 9 pages, 2 figures, minor changes, references added, version to
appear in Phys. Rev.
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