D-branes on general Script N = 1 backgrounds: superpotentials and D-terms

Martucci, Luca

doi:10.1088/1126-6708/2006/06/033

Cited by 148 publications

(333 citation statements)

References 78 publications

(191 reference statements)

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“…Indeed, for the case of the D7-branes one may consider endowing them with non-trivial worldvolume fluxes, as well as add the presence of closed string three-form fluxes in the background. Both effects will in general lift the D7-brane geometric moduli [22][23][24], while the D7-brane Wilson line moduli will remain unaffected. In contrast, the BPS conditions for D6-branes do not allow for non-trivial bundles, and considering more general compactifications to 4d Minkowski will not change the number of D6-brane moduli, which will be still be given by b 1 (Π 3 ) [25,26].…”

Section: Jhep11(2014)097mentioning

confidence: 99%

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On D-brane moduli stabilisation

Marchesano

Regalado

Zoccarato

2014

J. High Energ. Phys.

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Standard results in 4d N = 1 string compactifications assign a number of moduli to each space-time filling D-brane, computed by analysing the D-brane action in a fixed background. We revisit such conventional wisdom and argue that this naive counting of open string moduli is incorrect, in the sense that some of them will be lifted when making dynamical the bulk degrees of freedom. We explicitly discuss this effect for D6-branes wrapping special Lagrangian three-cycles, showing that some geometric and Wilson line moduli are lifted even before taking into account worldsheet instanton effects. From a 4d effective theory viewpoint the moduli lifting is due to an F-term potential, and can be deduced from the superpotentials in the literature. From a microscopic viewpoint the lifting is due to D-brane backreaction effects and flux quantisation in a compact manifold, and provides a mechanism for lifting Wilson line moduli. The latter applies to certain D6-branes and D7-brane Wilson lines, yielding new possibilities to build models of inflation in string theory.

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Section: Jhep11(2014)097mentioning

confidence: 99%

“…Care should be taken when deriving a scalar potential from (3.8) since, as pointed out in [24], the expression (3.1) is only the difference of the superpotential between two D6-brane positions, and not the absolute W D6…”

Section: Superpotential Analysismentioning

confidence: 99%

On D-brane moduli stabilisation

Marchesano

Regalado

Zoccarato

2014

J. High Energ. Phys.

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“…where W D7 has been derived in [117] in the absence of background fluxes, and later on in [118] for general N = 1 backgrounds. One should also be able to derive this superpotential by considering an F-theory lift of the above setup, interpreting the Gukov-Vafa-Witten superpotential in F-theory W = Y8 G 4 ∧ Ω 4 as a superpotential for the D7-brane moduli.…”

Section: Type Iib Fluxesmentioning

confidence: 99%

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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“…One way to incorporate the changes that arise upon localising a source is through "warped effective field theory" [7][8][9][10][11][12][13][14][15][16][17][18], in which one derives the correction to the fourdimensional effective action. Another way, which we are pursuing in this paper, is to work directly with the ten-dimensional equations of motion.…”

Section: Introductionmentioning

confidence: 99%

Smeared versus localised sources in flux compactifications

Blåbäck

Danielsson

Junghans

et al. 2010

J. High Energ. Phys.

105

218

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We investigate whether vacuum solutions in flux compactifications that are obtained with smeared sources (orientifolds or D-branes) still survive when the sources are localised. This seems to rely on whether the solutions are BPS or not. First we consider two sets of BPS solutions that both relate to the GKP solution through T-dualities: (p + 1)-dimensional solutions from spacetime-filling Op-planes with a conformally Ricci-flat internal space, and p-dimensional solutions with Op-planes that wrap a 1-cycle inside an everywhere negatively curved twisted torus. The relation between the solution with smeared orientifolds and the localised version is worked out in detail. We then demonstrate that a class of non-BPS AdS 4 solutions that exist for IASD fluxes and with smeared D3-branes (or analogously for ISD fluxes with anti-D3-branes) does not survive the localisation of the (anti) D3-branes. This casts doubts on the stringy consistency of non-BPS solutions that are obtained in the limit of smeared sources.

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D-branes on general Script N = 1 backgrounds: superpotentials and D-terms

Cited by 148 publications

References 78 publications

On D-brane moduli stabilisation

On D-brane moduli stabilisation

Progress in D‐brane model building

Smeared versus localised sources in flux compactifications

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