# Magnetic Fluxes, NS-NS B Field and Shifts in Four-Dimensional Orientifolds

@inproceedings{Pradisi2003MagneticFN, title={Magnetic Fluxes, NS-NS B Field and Shifts in Four-Dimensional Orientifolds}, author={Gianfranco Pradisi}, year={2003} }

We discuss the interplay between freely acting orbifold actions, discrete deformations and internal uniform magnetic fields in four-dimensional orientifold models.

## 14 Citations

### Beyond the SM; D-brane model building from intersecting brane worlds

- Physics
- 2004

We discuss the appearance of non-supersymmetric D6-brane GUT model constructions. We focus on the construction of the first examples of flipped SU(5) and SU(5) GUTS which have only the SM at low…

### The open story of the magnetic fluxes

- Mathematics
- 2005

We discuss the effects of oblique internal magnetic fields on the spectrum of type I superstrings compactified on tori. In particular we derive general formulae for the magnetic shifts and…

### Intersecting D-branes on shift Bbb Z2 × Bbb Z2 orientifolds

- Mathematics
- 2006

We investigate 2 × 2 orientifolds with group actions involving shifts. A complete classification of possible geometries is presented where also previous work by other authors is included in a unified…

### Gauge thresholds in the presence of oblique magnetic fluxes

- Physics
- 2005

We compute the one-loop partition function and analyze the conditions for tadpole cancellation in type I theories compactified on tori in the presence of internal oblique magnetic fields. We check…

### The frozen phase of F-theory

- MathematicsJournal of High Energy Physics
- 2018

We study the interpretation of O7+-planes in F-theory, mainly in the context of the six-dimensional models. In particular, we study how to assign gauge algebras and matter content to seven-branes and…

### Non-tachyonic Scherk-Schwarz compactifications, cosmology and moduli stabilization

- Physics, Mathematics
- 2004

It is well-known that Scherk-Schwarz compactifications in string theory have a tachyon in the closed string spectrum appearing for a critical value of a compact radius. The tachyon can be removed by…

### Chiral D-brane Models with Frozen Open String Moduli

- Mathematics
- 2005

Most intersecting D-brane vacua in the literature contain additional massless adjoint fields in their low energy spectrum. The existence of these additional fields make it difficult to obtain…

### The frozen phase of F-theory

- MathematicsJournal of High Energy Physics
- 2018

A bstractWe study the interpretation of O7+-planes in F-theory, mainly in the context of the six-dimensional models. In particular, we study how to assign gauge algebras and matter content to…

### TOWARD REALISTIC INTERSECTING D-BRANE MODELS

- Physics
- 2005

▪ Abstract We provide a pedagogical introduction to a recently studied class of phenomenologically interesting string models known as Intersecting D-Brane Models. The gauge fields of the Standard…

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- Physics
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I review the basic features of four dimensional Z 2 × Z 2 (shift) orientifolds with internal magnetic fields, describing two examples with N = 1 su- persymmetry. As in the corresponding…

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We present non-supersymmetric toroidal compactifications of type-I string theory with both constant background NSNS two-form flux and non-trivial magnetic flux on the various D9-branes. The…

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- Physics
- 2003

We review the construction of chiral four-dimensional compactifications of type IIA string theory with intersecting D6-branes. Such models lead to four-dimensional theories with non-Abelian gauge…

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- Physics
- 2002

We study four dimensional $Z_2 \times Z_2$ (shift)-orientifolds in presence of internal magnetic fields and NS-NS $B$-field backgrounds, describing in some detail one explicit example with N=1…

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- Physics
- 2000

We discuss the compactification of type I strings on a torus with additional background gauge flux on the D9-branes. The solutions to the cancellation of the RR tadpoles display various…

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In a classic paper, Fradkin and Tseytlin showed how magnetic deformations can be introduced in open strings. In this contribution we review some recent work on type-I vacua with magnetised branes and…