Zobrazeno 1 - 10
of 63
pro vyhledávání: '"Trapletti, M."'
Publikováno v:
JHEP 0903:011,2009
In an attempt to implement gauge mediation in string theory, we study string effective supergravity models of supersymmetry breaking, containing anomalous gauge factors. We discuss subtleties related to gauge invariance and the stabilization of the G
Externí odkaz:
http://arxiv.org/abs/0809.5064
We discuss the moduli stabilization arising in the presence of gauge fluxes, R-symmetry twists and non-perturbative effects in the context of 6-dimensional supergravity models. We show how the presence of D-terms, due to the gauge fluxes, is compatib
Externí odkaz:
http://arxiv.org/abs/0710.4877
Publikováno v:
Phys.Lett.B652:124-127,2007
The existence of multiple anomalous U(1)s is demonstrated explicitly in a blow-up version of a heterotic Z_3 orbifold. Another blow-up of the same orbifold supports further evidence for the type-I/heterotic duality in four dimensions. It has a single
Externí odkaz:
http://arxiv.org/abs/hep-th/0703211
Publikováno v:
JHEP 0703:035,2007
We describe blowups of C^n/Z_n orbifolds as complex line bundles over CP^{n-1}. We construct some gauge bundles on these resolutions. Apart from the standard embedding, we describe U(1) bundles and an SU(n-1) bundle. Both blowups and their gauge bund
Externí odkaz:
http://arxiv.org/abs/hep-th/0701227
Publikováno v:
JHEP 0702:015,2007
We analyse D-terms induced by gauge theory fluxes in the context of 6-dimensional supergravity models. On the one hand, this is arguably the simplest concrete setting in which the controversial idea of `D-term uplifts' can be investigated. On the oth
Externí odkaz:
http://arxiv.org/abs/hep-th/0611102
Publikováno v:
Nucl.Phys.B755:186-198,2006
We investigate, in the general framework of KKLT, the mediation of supersymmetry breaking by fields propagating in the strongly warped region of the compactification manifold ('throat fields'). Such fields can couple both to the supersymmetry breakin
Externí odkaz:
http://arxiv.org/abs/hep-th/0605232
Autor:
Trapletti, M.
Publikováno v:
Nucl.Phys. B730 (2005) 179-190
The issue of non-local GUT symmetry breaking is addressed in the context of open string model building. We study ZNxZM' orbifolds with all the GUT-breaking orbifold elements acting freely, as rotations accompanied by translations in the internal spac
Externí odkaz:
http://arxiv.org/abs/hep-th/0507151
Autor:
Hebecker, A., Trapletti, M.
Publikováno v:
Nucl.Phys.B713:173-203,2005
It is well-known that heterotic string compactifications have, in spite of their conceptual simplicity and aesthetic appeal, a serious problem with precision gauge coupling unification in the perturbative regime of string theory. Using both a duality
Externí odkaz:
http://arxiv.org/abs/hep-th/0411131
Autor:
Serone, M., Trapletti, M.
Publikováno v:
JHEP 0401 (2004) 012
A precise correspondence between freely-acting orbifolds (Scherk-Schwarz compactifications) and string vacua with NSNS flux turned on is established using T-duality. We focus our attention to a certain non-compact Z_2 heterotic freely-acting orbifold
Externí odkaz:
http://arxiv.org/abs/hep-th/0310245
Autor:
Trapletti, M.
Publikováno v:
JHEP 0302 (2003) 012
We study generic one-loop (string) amplitudes where an integration over the fundamental region F of the modular group is needed. We show how the known lattice-reduction technique used to unfold F to a more suitable region S can be modified to rearran
Externí odkaz:
http://arxiv.org/abs/hep-th/0211281