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pro vyhledávání: '"Sabra, W. A."'
Autor:
Sabra, W. A.
We present new families of solutions of D-dimensional Einstein-Maxwell theory depending on one variable for all space-time signatures. The solutions found can be thought of as generalized Melvin solutions including fluxtubes, domain walls and cosmolo
Externí odkaz:
http://arxiv.org/abs/2407.18089
Autor:
Sabra, W. A.
We consider Melvin-like cosmological and static solutions for the theories of ${\cal N}=2$, $D=4$ supergravity coupled to vector multiplets. We analyze the equations of motion and give some explicit solutions with one scalar and two gauge fields. Gen
Externí odkaz:
http://arxiv.org/abs/2306.04427
We classify supersymmetric solutions of D=5 (3,2) signature supergravity with either vanishing or imaginary gauge coupling constant preserving the minimal N=2 supersymmetry. We prove that the geometry of such solutions is characterized by a nilpotent
Externí odkaz:
http://arxiv.org/abs/2305.03023
Autor:
Sabra, W. A.
We consider general charged Kasner-like solutions for the theory of five-dimensional supergravity coupled to Abelian vector multiplets in arbitrary space-time signature. These solutions, depending on the choice of coordinates, can be thought of as ge
Externí odkaz:
http://arxiv.org/abs/2206.00467
Autor:
Sabra, W. A.
We discuss general bosonic configurations of four-dimensional N=2 supergravity coupled to vector multiplets in (t,s) space-time. The supergravity theories with Euclidean and neutral signature are described by the so-called para-special K\"ahler geome
Externí odkaz:
http://arxiv.org/abs/2111.05141
Autor:
Sabra, W. A.
Publikováno v:
Phys. Rev. D 104, 046012 (2021)
Relying on the method of spinorial geometry, purely bosonic supersymmetric solutions in N=2, five-dimensional supergravity theories coupled to vector multiplets in all space-time signatures are found. Explicit examples of some new solutions are prese
Externí odkaz:
http://arxiv.org/abs/2105.00806
Autor:
Gutowski, J. B., Sabra, W. A.
We classify all supersymmetric solutions of minimal D=4 gauged supergravity with (2,2) signature and a positive cosmological constant which admit exactly one Killing spinor. This classification produces a geometric structure which is more general tha
Externí odkaz:
http://arxiv.org/abs/2006.06312
Autor:
Sabra, W. A.
We present static and time-dependent solutions for the theory of gravity with a dilaton field and an arbitrary rank antisymmetric tensor. The solutions constructed are valid for arbitrary space-time dimensions and signatures.
Comment: 12 pages
Comment: 12 pages
Externí odkaz:
http://arxiv.org/abs/2005.03953
Autor:
Gutowski, J. B., Sabra, W. A.
Spinorial geometry methods are used to classify solutions admitting Majorana Killing spinors of the minimal 4-dimensional supergravity in neutral signature, with vanishing cosmological constant and a single Maxwell field strength. Two classes of solu
Externí odkaz:
http://arxiv.org/abs/1905.01910
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