Internal magnetic fields and supersymmetry in orientifolds

Dudas, Emilian; Timirgaziu, Cristina

doi:10.1016/j.nuclphysb.2005.03.020

Cited by 54 publications

(71 citation statements)

References 75 publications

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“…Later on, type I models based on magnetized D9-branes were constructed [18,87], basically following the initial proposal of [69]. Finally, after N = 1 chiral models based on intersecting D6-branes were built, D = 4, N = 1 type I models with non-trivial bundles have also been constructed [88,89].…”

Section: Type Iib Model Buildingmentioning

confidence: 99%

Progress in D‐brane model building

Marchesano¹

2007

Fortschritte der Physik

154

234

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The state of the art in D-brane model building is briefly reviewed, focusing on recent achievements in the construction of D = 4 N = 1 type II string vacua with semi-realistic gauge sectors. Such progress relies on a better understanding of the spectrum of BPS D-branes, the effective field theory obtained from them and the explicit construction of vacua. We first consider D-branes in standard Calabi-Yau compactifications, and then the more involved case of compactifications with fluxes. We discuss how the non-trivial interplay between D-branes and fluxes modifies the previous model-building rules, as well as provides new possibilities to connect string theory to particle physics. MotivationAs often emphasized in the literature, string theory gained its popularity among physicists in the mid-80's, as it was recognized as an outstanding candidate for a unified theory of all forces in nature. Not only would it incorporate quantum gravity, but also supersymmetry and non-Abelian gauge interactions. With such ingredients it was soon realized that, upon compactification, one could conceive D = 4 N = 1 effective theories remarkably close to natural extensions of the Standard Model [1].Further developments of the theory showed that the set of string theory vacua is quite complex even at a qualitative level. On the one hand we learned that seemingly different vacua could be dual to each other and, in fact, should be considered to be the same. On the other hand, it has been estimated that the set of semi-realistic vacua is enormous. This latter point has recently raised the question of whether string theory can reproduce almost any D = 4 effective theory that one may think of and, in particular, many possible physics beyond the Standard Model. If that was the case, one may drop the classical strategy to focus on a particular string theory model by means of some vacuum selection principle, and instead try to extract physical information out of the ensemble of realistic vacua via an statistical approach [2]. Now, while string theory has proven to be an excellent generator of phenomenologically interesting scenarios, a string vacuum reproducing the physics observed at particle accelerators is yet to be found. Individual vacua analyzed so far not only fail to describe fully realistic D = 4 physics because of some technical details like extra massless particles or unrealistic couplings, but also because of deep conceptual issues like gauge coupling unification, hierarchy problems and supersymmetry breaking. Moreover, recent cosmological observations have slightly changed our perspective on how a semi-realistic vacuum should be obtained and, in general, agreement with cosmological data puts even more constraints on realistic string constructions.Pointing out these facts is not intended to discourage those interested in the field of model building. On the contrary, there has recently been huge progress (some of which the present review is based on) in constructing vacua which are more and more realistic, and we expect much more p...

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Section: Type Iib Model Buildingmentioning

confidence: 99%

Progress in D‐brane model building

Marchesano¹

2007

Fortschritte der Physik

154

234

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“…More concretely, we study supersymmetric intersecting D-brane models on the T 6 Z 2 ×Z 2 orientifold background, which has enjoyed great interest in the past (see e.g. [37][38][39][40][41] among many others). We consider the ensemble of solutions to the tadpole cancellation conditions using 1 Criticism of the landscape idea is expressed in [24,25].…”

Section: Introductionmentioning

confidence: 99%

One in a billion: MSSM-like D-brane statistics

Gmeiner¹,

Blumenhagen²,

Honecker³

et al. 2006

J. High Energy Phys.

185

253

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Continuing our recent work hep-th/0411173, we study the statistics of fourdimensional, supersymmetric intersecting D-brane models in a toroidal orientifold background. We have performed a vast computer survey of solutions to the stringy consistency conditions and present their statistical implications with special emphasis on the frequency of Standard Model features. Among the topics we discuss are the implications of the K-theory constraints, statistical correlations among physical quantities and an investigation of the various statistical suppression factors arising once certain Standard Model features are required. We estimate the frequency of an MSSM like gauge group with three generations to be one in a billion.

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“…In [50,51,33] the case 2M = 2 (Z 2 × Z 2 ) was studied and toy models with removed adjoint moduli were presented. 2 Another, empirical, observation favouring the discrete torsion orbifolds has been made in [57]: In cases where there are no three family models without discrete torsion (viz.…”

Section: Introductionmentioning

confidence: 99%

Rigid D6-branes on $ {{{{T^6}}} \left/ {{\left( {{Z_2} \times {Z_{2M}} \times \Omega \mathcal{R}} \right)}} \right.} $ with discrete torsion

Förste

Honecker

2011

J. High Energ. Phys.

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We give a complete classification of T 6 /(Z 2 × Z 2M × ΩR) orientifolds on factorisable tori and rigid D6-branes on them. The analysis includes the supersymmetry, RR tadpole cancellation and K-theory conditions and complete massless open and closed string spectrum (i.e. non-chiral as well as chiral) for fractional or rigid D6-branes for all inequivalent compactification lattices, without and with discrete torsion. We give examples for each orbifold background, which show that on Z 2 × Z 6 and Z 2 × Z 6 there exist completely rigid D6-branes despite the self-intersections of orbifold image cycles. This opens up a new avenue for improved Standard Model building. On the other hand, we show that Standard and GUT model building on the Z 2 × Z 4 background is ruled out by simple arguments.arXiv:1010.6070v3 [hep-th]

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Internal magnetic fields and supersymmetry in orientifolds

Cited by 54 publications

References 75 publications

Progress in D‐brane model building

Progress in D‐brane model building

One in a billion: MSSM-like D-brane statistics

Rigid D6-branes on $ {{{{T^6}}} \left/ {{\left( {{Z_2} \times {Z_{2M}} \times \Omega \mathcal{R}} \right)}} \right.} $ with discrete torsion

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