340 citations · 1k across the 16 of their papers we have counts for
16 papers
Defect Branes
E. Bergshoeff, T. Ortin, F. Riccioni
We discuss some general properties of "defect branes", i.e. branes of co-dimension two, in (toroidally compactified) IIA/IIB string theory. In particular, we give a full classifica…
On supersymmetric Einstein-Weyl spaces
P. Meessen, T. Ortín, A. Palomo-Lozano
We consider weighted parallel spinors in Lorentzian Weyl geometry in arbitrary dimensions, choosing the weight such that the integrability condition for the existence of such a spi…
The Tensor Hierarchies of Pure N=2,d=4,5,6 Supergravities
Mechthild Huebscher, Tomas Ortin, C. S. Shahbazi
We study the supersymmetric tensor hierarchy of pure (gauged) N=2,d=4,5,6 supergravity and compare them with those of the pure, ungauged, theories (worked out by Gomis and Roest fo…
All the supersymmetric solutions of N=1,d=5 ungauged supergravity
J. Bellorin, P. Meessen, T. Ortin
We classify the supersymmetric solutions of ungauged N=1 d=5 SUGRA coupled to vector multiplets and hypermultiplets. All the solutions can be seen as deformations of solutions with…
New Formulations of D=10 Supersymmetry and D8-O8 Domain Walls
E. Bergshoeff, R. Kallosh, T. Ortin +2
We discuss a generalized form of IIA/IIB supergravity depending on all R-R potentials C^(p) (p=0,1,...,9) as the effective field theory of Type IIA/IIB superstring theory. For the…
Supersymmetry of topological Kerr-Newmann-Taub-NUT-aDS spacetimes
N. Alonso-Alberca, P. Meessen, T. Ortin
We extend the topological Kerr-Newman-aDS solutions by including NUT charge and find generalizations of the Robinson-Bertotti solution to the negative cosmological constant case wi…
Massive Branes
E. Bergshoeff, Y. Lozano, T. Ortin
We investigate the effective worldvolume theories of branes in a background given by (the bosonic sector of) 10-dimensional massive IIA supergravity (``massive branes'') and their…
Massless Black Holes as Black Diholes and Quadruholes
Tomas Ortin
Massless black holes can be understood as bound states of a (positive mass) extreme a=\sqrt{3} black hole and a singular object with opposite (i.e. negative) mass with vanishing AD…
FERMION ZERO MODES AND BLACK-HOLE HYPERMULTIPLETS WITH RIGID SUPERSYMMETRY
Roger Brooks, Renata Kallosh, Tomas Ortin
The gravitini zero modes riding on top of the extreme Reissner-Nordstrom black-hole solution of N=2 supergravity are shown to be normalizable. The gravitini and dilatini zero modes…
TIME-SYMMETRIC INITIAL DATA SETS IN 4--D DILATON GRAVITY
T. Ortin
I study the time--symmetric initial--data problem in theories with a massless scalar field (dilaton), free or coupled to a Maxwell field in the stringy way, finding different initi…
Duality Versus Supersymmetry and Compactification
E. Bergshoeff, R. Kallosh, T. Ortín
We study the interplay between T-duality, compactification and supersymmetry. We prove that when the original configuration has unbroken space-time supersymmetries, the dual config…
Exact SU(2)*U(1) Stringy Black Holes
R. Kallosh, T. Ortin
Extreme magnetic dilaton black holes are promoted to exact solutions of heterotic string theory with unbroken supersymmetry. With account taken of alpha' corrections this is accomp…
Supersymmetry and Stationary Solutions in Dilaton-Axion Gravity
Renata Kallosh, David Kastor, Tomas Ortin +1
New stationary solutions of -dimensional dilaton-axion gravity are presented, which correspond to the charged Taub-NUT and Israel-Wilson-Perjes (IWP) solutions of Einstein-Maxwe…
Black-Hole-Wave Duality in String Theory
Eric Bergshoeff, Renata Kallosh, Tomas Ortin
Extreme 4-dimensional dilaton black holes embedded into 10-dimensional geometry are shown to be dual to the gravitational waves in string theory. The corresponding gravitational wa…
Sl(2,R)-Duality Covariance of Killing Spinors in Axion-Dilaton Black Holes
Tomás Ortín
Under electric-magnetic duality transformations the Bogomolnyi bound of dilaton-axion black holes is known to be invariant. In this paper we show that this invariance cor…
Electric-Magnetic Duality and Supersymmetry in Stringy Black Holes
Tomás Ortín
We present a generalization of the charged dilaton black holes family whose main feature is that both fields have electric and magnetic charges, the axion field s…