Gaugino condensates and<i>D</i>-terms from D7-branes

Haack, Michael; Krefl, Daniel; Lüst, Dieter; Proeyen, Antoine Van; Zagermann, Marco

doi:10.1088/1126-6708/2007/01/078

Cited by 178 publications

(303 citation statements)

References 83 publications

(201 reference statements)

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“…In general, we expect the same kind of results at both sides of the mirror map. This is easy to see for some quantities like the gauge kinetic function, which in the type IIB case reads [67,78] fig. 3.b)) and in type IIB can be computed from the overlap of three wavefunctions, just like for heterotic compactifications in the large volume limit.…”

Section: Type Iib Model Buildingmentioning

confidence: 87%

Progress in D‐brane model building

Marchesano¹

2007

Fortschritte der Physik

152

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: 87%

Progress in D‐brane model building

Marchesano¹

2007

Fortschritte der Physik

152

234

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“…The q ij =f k i k ijk are then the charges of the Kähler moduli T i under the anomalous U(1) [33,34].…”

Section: Visible Sector Cycle Stabilisation By D-termsmentioning

confidence: 99%

Dark Radiation predictions from general Large Volume Scenarios

Hebecker

Mangat

Rompineve

et al. 2014

J. High Energ. Phys.

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Recent observations constrain the amount of Dark Radiation (∆N eff ) and may even hint towards a non-zero value of ∆N eff . It is by now well-known that this puts stringent constraints on the sequestered Large Volume Scenario (LVS), i.e. on LVS realisations with the Standard Model at a singularity. We go beyond this setting by considering LVS models where SM fields are realised on 7-branes in the geometric regime. As we argue, this naturally goes together with high-scale supersymmetry. The abundance of Dark Radiation is determined by the competition between the decay of the lightest modulus to axions, to the SM Higgs and to gauge fields, and leads to strict constraints on these models. Nevertheless, these constructions can in principle meet current DR bounds due to decays into gauge bosons alone. Further, a rather robust prediction for a substantial amount of Dark Radiation can be made. This applies both to cases where the SM 4-cycles are stabilised by D-terms and are small 'by accident', i.e. tuning, as well as to fibred models with the small cycles stabilised by loops. In these constructions the DR axion and the QCD axion are the same field and we require a tuning of the initial misalignment to avoid Dark Matter overproduction. Furthermore, we analyse a closely related setting where the SM lives at a singularity but couples to the volume modulus through flavour branes. We conclude that some of the most natural LVS settings with natural values of model parameters lead to Dark Radiation predictions just below the present observational limits. Barring a discovery, rather modest improvements of present Dark Radiation bounds can rule out many of these most simple and generic variants of the LVS.

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“…It turns out that somewhat novel stringy instanton effects which have recently been investigated in several other contexts [32,33,34,35,36,37,38] contribute corrections to W which depend on gauge invariants that usually do not appear in the superconformal quiver superpotential. Recall that these effects arise when Euclidean D branes wrap cycles corresponding to quiver nodes which are not occupied by space-filling branes.…”

Section: A Mass Term Generated By a Stringy Instantonmentioning

confidence: 99%

Meta-Stable Vacua and D-Branes at the Conifold

Argurio¹,

Bertolini²,

Franco³

et al. 2008

AIP Conference Proceedings

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We consider quiver gauge theories arising on D-branes at simple Calabi-Yau singularities (quotients of the conifold). These theories have metastable supersymmetry breaking vacua. The field theoretic mechanism is basically the one exhibited by the examples of Intriligator, Seiberg and Shih in SUSY QCD. In a dual description, the SUSY breaking is captured by the presence of anti-branes. In comparison to our earlier related work, the main improvements of the present construction are that we can reach the free magnetic range of the SUSY QCD theory where the existence of the metastable vacua is on firm footing, and we can see explicitly how the small masses for the quark flavors (necessary to the existence of the SUSY breaking vacua) are dynamically stabilized. One crucial mass term is generated by a stringy instanton. Finally, our models naturally incorporate R-symmetry breaking in the non-supersymmetric vacuum, in a way similar to the examples of Kitano, Ooguri and Ookouchi.

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Gaugino condensates andD-terms from D7-branes

Cited by 178 publications

References 83 publications

Progress in D‐brane model building

Progress in D‐brane model building

Dark Radiation predictions from general Large Volume Scenarios

Meta-Stable Vacua and D-Branes at the Conifold

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