Results 11 to 20 of about 808 (166)
A search for exact superstring vacua [PDF]
Il Nuovo Cimento A, 1994 We investigate $2d$ sigma-models with a $2+N$ dimensional Minkowski signature target space metric and Killing symmetry, specifically supersymmetrized, and see under which conditions they might lead to corresponding exact string vacua. It appears that the
Peterman, A., Zichichi, A.
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Superstring cosmology for N_4 = 1 -> 0 superstring vacua [PDF]
Fortschritte der Physik, 2010 We study the cosmology of perturbative superstring theory during the radiation(-like) era for semi-realistic backgrounds with initial N=1 supersymmetry.
Estes, John +5 more
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Geometry and Quantum Symmetries of Superstring Vacua [PDF]
, 1992 We report on some recent progress which has been made in the understanding of general features of superstring compactifications. The following aspects are discussed: special geometry of the moduli space of (2,2) vacua, target-space duality symmetries, differential equations for the periods of holomorphic three-forms, and higher loop (genus) string ...
Ferrara S
exaly +3 more sources
Anomalous U(1)s in Type I superstring vacua
, 2002 We perform a systematic string computation of the masses of anomalous U(1) gauge bosons in four-dimensional orientifold vacua, and we study their localization properties in the internal (compactified) space.
Rizos, J +7 more
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Classification of Flat Directions in Perturbative Heterotic Superstring Vacua with Anomalous U(1) [PDF]
Nuclear Physics B, 1997 We develop techniques to classify D- and F-flat directions for N=1 supersymmetric string vacua of the perturbative heterotic string theory, which possess an anomalous U(1) gauge group at the tree level.
Langacker, P G +4 more
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Spacetime Variable Superstring Vacua [PDF]
International Journal of Modern Physics A, 1993 In a general superstring vacuum configuration, the `internal' space (sector) varies in spacetime. When this variation is non-trivial only in two space-like dimensions, the vacuum contains static cosmic strings with finite energy per unit length and which is, up to interactions with matter, an easily computed topological invariant.
Green, Paul S., Hubsch, Tristan
openaire +4 more sources
On the Role of Torsion and Higher Forms in Off‐Shell Supergravity
Fortschritte der Physik, Volume 71, Issue 8-9, September 2023., 2023 Abstract The presence of a nonvanishing totally antisymmetric (super)torsion, equivalent to an axial vector, and higher forms in the “new minimal” and “old minimal” off‐shell formulations of N=1$\mathcal {N}=1$, D=4$D=4$ supergravity is elaborated. The geometric superspace approach and study both the geometric Lagrangian and the off‐shell closure of ...
Lucrezia Ravera
wiley +1 more source
Enhancement of Out‐of‐Plane Spin–Orbit Torque by Interfacial Modification
Advanced Materials, Volume 35, Issue 12, March 23, 2023., 2023 The oxidation in CuPt/ferromagnet interface is found to be able to enhance the out‐of‐plane (OOP) torque and associated spin–orbit torque (SOT) switching efficiency with remaining threefold rotational symmetry. The enhancement is independent of the device shapes, magnetic materials, or magnetization easy axis.
Tieyang Zhao +11 more
wiley +1 more source
Mass Hierarchies and Quantum Gravity Constraints in DKMM‐refined KKLT
Fortschritte der Physik, Volume 71, Issue 1, January 2023., 2023 Abstract We carefully revisit the mass hierarchies for the KKLT scenario with an uplift term from an anti D3‐brane in a strongly warped throat. First, we derive the bound resulting from what is usually termed “the throat fitting into the bulk” directly from the Klebanov‐Strassler geometry.
Ralph Blumenhagen +2 more
wiley +1 more source
Spinor–vector duality in heterotic SUSY vacua [PDF]
, 2009 We elaborate on the recently discovered spinor–vector duality in realistic free fermionic heterotic vacua. We emphasize the interpretation of the freely-acting orbifolds carried out on the six internal dimensions as coordinate-dependent compactifications;
Kounnas, Costas +3 more
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