Continuous global symmetries and hyperweak interactions in string compactifications

Burgess, C.P.; Conlon, Joseph P.; Hung, Ling-Yan; Kom, C. H.; Maharana, Anshuman; Quevedo, Fernando

doi:10.1088/1126-6708/2008/07/073

Cited by 69 publications

(65 citation statements)

References 97 publications

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“…In type IIB constructions the Abelian factors have been the central players in much of the resulting phenomenology affecting, as a brief sample: the chiral spectrum (see e.g. [30][31][32][33] for reviews), selection rules on field theory couplings [34][35][36][37], moduli stabilisation and supersymmetry breaking [38,39], mixing with visible sector fields [40][41][42][43][44], gauge coupling unification [45] amongst many other features. In F-theory models U(1) symmetries also have a central role, see [46][47][48][49][50][51][52][53][54][55] and references therein for an incomplete list of uses.…”

Section: Jhep12(2011)004mentioning

confidence: 99%

Massive Abelian gauge symmetries and fluxes in F-theory

Grimm

Kerstan

Palti

et al. 2011

J. High Energ. Phys.

110

348

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F-theory compactified on a Calabi-Yau fourfold naturally describes nonAbelian gauge symmetries through the singularity structure of the elliptic fibration. In contrast Abelian symmetries are more difficult to study because of their inherently global nature. We argue that in general F-theory compactifications there are massive Abelian symmetries, such as the uplift of the Abelian part of the U(N ) gauge group on D7-branes, that arise from non-Kähler resolutions of the dual M-theory setup. The four-dimensional F-theory vacuum with vanishing expectation values for the gauge fields corresponds to the Calabi-Yau limit. We propose that fluxes that are turned on along these U(1)s are uplifted to non-harmonic four-form fluxes. We derive the effective four-dimensional gauged supergravity resulting from F-theory compactifications in the presence of the Abelian gauge factors including the effects of possible fluxes on the gauging, tadpoles and matter spectrum.

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Section: Jhep12(2011)004mentioning

confidence: 99%

Massive Abelian gauge symmetries and fluxes in F-theory

Grimm

Kerstan

Palti

et al. 2011

J. High Energ. Phys.

110

348

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“…See [58] for more details. 15 We do not consider fibred Calabi-Yau manifolds here, where the lightest modulus can be given by a mode orthogonal to the volume.…”

Section: Jhep09(2014)140mentioning

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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“…Because of the above enhancement much smaller additional boost factors are needed to fit the positron data [51]. For other works on the Stueckelberg mechanism and applications see [52,53,21]. and for other works on dark matter from hidden sector see [49,54].…”

Section: Milli Weak Dark Mattermentioning

confidence: 99%

“…There are many related works on U (1) extensions (see, e.g., [14], and for a review see [15]) as well as works where hidden sectors play a central role [16,17,18,19,20,21,22,23,24]. Further recent works regarding Stueckelberg extensions in the context of the string and D brane models can be found in [25,26,27] and in [28,29].…”

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confidence: 99%

Predicted Signatures at the LHC from U(1) Extensions of the Standard Model

Nath¹

2011

Predicted and Totally Unexpected in the Energy Frontier Opened by LHC

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We discuss the U (1) X extensions of the standard model with focus on the Stueckelberg mechanism for mass growth for the extra U (1) X gauge boson. The assumption of an axionic connector field which carries dual U (1) quantum numbers, i.e., quantum numbers for the hypercharge U (1) Y and for the hidden sector gauge group U (1) X , allows a non-trivial mixing between the mass growth for the neutral gauge vector bosons in the SU (2) L × U (1) Y sector and the mass growth for the vector boson by the Stueckelberg mechanism in the U (1) X sector. This results in an extra Z ′ which can be very narrow, but still detectable at the Large Hadron Collider (LHC). The U (1) X extension of the minimal supersymmetric standard model is also considered and the role of the Fayet-Illiopoulos term in such an extension discussed. The U (1) X extensions of the SM and of the MSSM lead to new candidates for dark matter.

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Continuous global symmetries and hyperweak interactions in string compactifications

Abstract: 1 The capital 'LARGE' emphasises that the volume is enormously large compared to the string scale. 2 Unless otherwise specified, throughout this paper numerical values of lengths and volumes will all be in units of the fundamental (string) scale, ls = 2π √ α ′ .

Cited by 69 publications

References 97 publications

Massive Abelian gauge symmetries and fluxes in F-theory

Massive Abelian gauge symmetries and fluxes in F-theory

Dark Radiation predictions from general Large Volume Scenarios

Predicted Signatures at the LHC from U(1) Extensions of the Standard Model

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