Zobrazeno 1 - 10
of 121
pro vyhledávání: '"Angelantonj, C."'
We construct new string vacua featuring Brane Supersymmetry Breaking, based on $T^4/\mathbb{Z}_N$ orientifolds with $\text{O}5_+$ planes and $\overline{\text{D}5}$ branes. Differently from the original construction, in these vacua the cancellation of
Externí odkaz:
http://arxiv.org/abs/2403.02392
Publikováno v:
JHEP 1007:004,2010
The three generation heterotic-string models in the free fermionic formulation are among the most realistic string vacua constructed to date, which motivated their detailed investigation. The classification of free fermion heterotic string vacua has
Externí odkaz:
http://arxiv.org/abs/1003.5801
Publikováno v:
Nucl.Phys.B818:52-94,2009
We compute instantonic effects in globally consistent T^6/Z2xZ2 orientifold models with discrete torsion and magnetised D-branes. We consider fractional branes and instantons wrapping the same rigid cycles. We clarify and analyse in detail the low-en
Externí odkaz:
http://arxiv.org/abs/0902.1694
Publikováno v:
Nucl.Phys.B809:291-307,2009
We consider closed type II and orientifold backgrounds where supersymmetry is spontaneously broken by asymmetric geometrical fluxes. We show that these can be used to describe thermal ensembles with chemical potentials associated to "gravito-magnetic
Externí odkaz:
http://arxiv.org/abs/0808.1357
Autor:
Angelantonj, C., Dudas, E.
Publikováno v:
Phys.Lett.B651:239-245,2007
We argue that tachyon-free type I string vacua with supersymmetry breaking in the open sector at the string scale can be interpreted, via S and T-duality arguments, as metastable vacua of supersymmetric type I superstring. The dynamics of the process
Externí odkaz:
http://arxiv.org/abs/0704.2553
Publikováno v:
Phys.Lett.B641:474-480,2006
The one-loop vacuum energy is explicitly computed for a class of perturbative string vacua where supersymmetry is spontaneously broken by a T-duality invariant asymmetric Scherk-Schwarz deformation. The low-lying spectrum is tachyon-free for any valu
Externí odkaz:
http://arxiv.org/abs/hep-th/0608022
Publikováno v:
Nucl.Phys. B725 (2005) 115-154
We study the effect of Scherk-Schwarz deformations on intersecting branes. Non-chiral fermions in any representation of the Chan-Paton gauge group generically acquire a tree-level mass dependent on the compactification radius and the brane wrapping n
Externí odkaz:
http://arxiv.org/abs/hep-th/0503179
Publikováno v:
Phys.Lett.B583:331-337,2004
We extend the four-dimensional gauged supergravity analysis of type IIB vacua on $K3\times T^2/Z_2$ to the case where also D3 and D7 moduli, belonging to N=2 vector multiplets, are turned on. In this case, the overall special geometry does not corres
Externí odkaz:
http://arxiv.org/abs/hep-th/0312019
Publikováno v:
JHEP 0310 (2003) 015
We consider classes of T_6 orientifolds, where the orientifold projection contains an inversion I_{9-p} on 9-p coordinates, transverse to a Dp-brane. In absence of fluxes, the massless sector of these models corresponds to diverse forms of N=4 superg
Externí odkaz:
http://arxiv.org/abs/hep-th/0306185
Autor:
Angelantonj, C.
Publikováno v:
Fortsch.Phys. 51 (2003) 646-651
We review orientifold constructions in the presence of magnetic backgrounds both in the open and closed sectors. Generically, the resulting orientifold models have a nice geometric description in terms of rotated D-branes and/or O-planes. In the case
Externí odkaz:
http://arxiv.org/abs/hep-th/0212066