#### Filter Results:

- Full text PDF available (8)

#### Publication Year

1983

2008

- This year (0)
- Last 5 years (0)
- Last 10 years (1)

#### Publication Type

#### Co-author

#### Journals and Conferences

Learn More

- G. Aldazabal, A. Font, L. E. Ibáñez, A. M. Uranga
- 1996

We study heterotic E8 × E8 models that are dual to compactifications of Ftheory and type IIA string on certain classes of elliptically fibered Calabi-Yau manifolds. Different choices for the specific torus in the fibration have heterotic duals that are most easily understood in terms of E8 ×E8 models with gauge backgrounds of type H ×U(1)8−d, where H is a… (More)

- IIB Orientifolds, G. Aldazabal, A. Font, L. E. Ibáñez, G. Violero
- 1998

We study different aspects of the construction of D=4, N=1 type IIB orientifolds based on toroidal ZN and ZM×ZN , D=4 orbifolds. We find that tadpole cancellation conditions are in general more constraining than in six dimensions and that the standard Gimon-Polchinski orientifold projection leads to the impossibility of tadpole cancellations in a number of… (More)

- G. Aldazabal, A. Font, L. E. Ibáñez, A. M. Uranga, G. Violero
- 1997

We consider D = 6, N = 1, ZM orbifold compactifications of heterotic strings in which the usual modular invariance constraints are violated. It is argued that in the presence of non-perturbative effects many of these vacua are nevertheless consistent. The perturbative massless sector can be computed explicitly from the perturbative mass formula subject to… (More)

- A. Font
- 2006

Up to now chiral type IIA vacua have been mostly based on intersecting D6-branes wrapping special Lagrangian 3-cycles on a CY3 manifold. We argue that there are additional BPS Dbranes which have so far been neglected, and which seem to have interesting model-building features. They are coisotropic D8-branes, in the sense of Kapustin and Orlov. The D8-branes… (More)

In this work we classify the subalgebras satisfied by non-geometric Q-fluxes in type IIB orientifolds on T/(Z2 × Z2) with three moduli (S, T, U). We find that there are five subalgebras compatible with the symmetries, each one leading to a characteristic flux-induced superpotential. Working in the 4-dimensional effective supergravity we obtain families of… (More)

We study type IIB orientifolds on T/ZN with supersymmetry broken by the compactification. We determine tadpole cancellation conditions including antibranes and considering different actions for the parity Ω. Using these conditions we then obtain the spectrum of tachyons and massless states. Various examples with N even correspond to type 0B orientifolds. On… (More)

- R Blumenhagen, A Font, A Kumar, D Lüst
- 1999

A construction of compact tachyon-free orientifolds of the nonsupersymmetric Type 0B string theory is presented. Moreover, we study effective non-supersymmetric gauge theories arising on self-dual D3-branes in Type 0B orbifolds and orientifolds. PACS numbers: 11.25.-w, 11.25.Sq Submitted to: Class. Quantum Grav. § Talk presented by R.B. at Strings ’99,… (More)

- G Aldazabal, I Allekotte, A Font, C Núñez
- 1991

We consider 4-dimensional string models obtained by tensoring N=2 coset theories with non-diagonal modular invariants. We present results from a systematic analysis including moddings by discrete symmetries. ∗ Work partially supported by CONICET of Argentina, by the Commission of the European Communities under contract No. C 11-0540-M(TT), and by Fundación… (More)

- ‹
- 1
- ›