SUSY breaking in local string/F-theory models

Blumenhagen, Ralph; Conlon, Joseph P.; Krippendorf, Sven; Moster, Sebastian; Quevedo, Fernando

doi:10.1088/1126-6708/2009/09/007

Cited by 162 publications

(349 citation statements)

References 50 publications

Supporting

Mentioning

338

Contrasting

Unclassified

Order By: Relevance

“…5 If B is taken to be a supersymmetry-breaking sector, and A is the visible sector, then the notion of decoupling described here corresponds to what is called sequestering [508] in the literature on supersymmetry breaking. Investigations of sequestering in string theory [509][510][511][512][513][514] have confirmed that complete decoupling is extremely rare, but partial suppression of some couplings can occur in certain cases [512].…”

Section: Compactness and Non-decouplingmentioning

confidence: 98%

Inflation and String Theory

2015

View full text Add to dashboard Cite

show abstract

Section: Compactness and Non-decouplingmentioning

confidence: 98%

Inflation and String Theory

2015

View full text Add to dashboard Cite

show abstract

“…To make this rate comparable to the decay rate into Higgs fields, we would need a mass for matter scalars close to the threshold m soft = m τ b /2. In the sequestered case, soft scalar masses arise at least at a scale m soft ∼ M P /V 2 , but could also be as high as m soft ∼ M P /V 3/2 [19]. 5 To determine the exact scale requires knowledge of yet undetermined corrections to the Kähler potential.…”

Section: Jhep09(2014)140mentioning

confidence: 99%

Dark Radiation predictions from general Large Volume Scenarios

Hebecker

Mangat

Rompineve

et al. 2014

J. High Energ. Phys.

View full text Add to dashboard Cite

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.

show abstract

“…The alternative to the geometric regime is to imagine the SM is built from fractional D-branes located at the singularity obtained by shrinking the blow-up mode supporting the SM brane: τ SM → 0 [63,64]. In this scenario τ SM cannot be any of the Kähler moduli discussed in previous sections, since these are all larger than l s by assumption.…”

Section: Jhep10(2011)119mentioning

confidence: 99%

“…Again we need a fourth cycle, τ 4 , to support the SM branes. If this cycle is rigid and does not intersect any of the other cycles, then τ 4 can be forced to shrink at the singularity, τ 4 → 0, using D-terms [63,64]. This picture has two attractive features.…”

Section: Jhep10(2011)119mentioning

confidence: 99%

See 1 more Smart Citation

Anisotropic modulus stabilisation: strings at LHC scales with micron-sized extra dimensions

Cicoli

Burgess

Quevedo

2011

J. High Energ. Phys.

151

View full text Add to dashboard Cite

We construct flux-stabilised Type IIB string compactifications whose extra dimensions have very different sizes, and use these to describe several types of vacua with a TeV string scale. Because we can access regimes where two dimensions are hierarchically larger than the other four, we find examples where two dimensions are micron-sized while the other four are at the weak scale in addition to more standard examples with all six extra dimensions equally large. Besides providing ultraviolet completeness, the phenomenology of these models is richer than vanilla large-dimensional models in several generic ways: (i) they are supersymmetric, with supersymmetry broken at sub-eV scales in the bulk but only nonlinearly realised in the Standard Model sector, leading to no MSSM superpartners for ordinary particles and many more bulk missing-energy channels, as in supersymmetric large extra dimensions (SLED); (ii) small cycles in the more complicated extra-dimensional geometry allow some KK states to reside at TeV scales even if all six extra dimensions are nominally much larger; (iii) a rich spectrum of string and KK states at TeV scales; and (iv) an equally rich spectrum of very light moduli exist having unusually small (but technically natural) masses, with potentially interesting implications for cosmology and astrophysics that nonetheless evade new-force constraints. The hierarchy problem is solved in these models because the extra-dimensional volume is naturally stabilised at exponentially large values: the extra dimensions are Calabi-Yau geometries with a 4D K3 or T 4 -fibration over a Open Access doi:10.1007/JHEP10 (2011)119 JHEP10 (2011)119 2D base, with moduli stabilised within the well-established LARGE-Volume scenario. The new technical step is the use of poly-instanton corrections to the superpotential (which, unlike for simpler models, are likely to be present on K3 or T 4 -fibered Calabi-Yau compactifications) to obtain a large hierarchy between the sizes of different dimensions. For several scenarios we identify the low-energy spectrum and briefly discuss some of their astrophysical, cosmological and phenomenological implications.

show abstract

SUSY breaking in local string/F-theory models

Cited by 162 publications

References 50 publications

Inflation and String Theory

Inflation and String Theory

Dark Radiation predictions from general Large Volume Scenarios

Anisotropic modulus stabilisation: strings at LHC scales with micron-sized extra dimensions

Contact Info

Product

Resources

About