Mass-deformed brane tilings

Self Cite

We study the interplay between mass deformations and unoriented projections of super-conformal quiver gauge theories resulting from D3-branes at (toric) Calabi-Yau singularities. We focus on simple orbifold cases (C 3 /Z 3 and C 3 /Z 4) and their non-orbifold descendants. This allows us to generalize the construction rules and clarify points that have been previously overlooked. In particular we spell out the conditions of anomaly cancellations as well as super-conformal invariance that typically require the introduction of flavour branes, which in turn may spoil toric symmetry. Finally, we discuss duality cascades in this context and the interplay between Seiberg/toric duality and unoriented projection with (or without) mass deformations.

Section: Jhep07(2020)015 1 Introduction and Motivationsmentioning

confidence: 70%

Section: 2) and Its Mass Deformationmentioning

confidence: 99%

See 1 more Smart Citation

Mass deformations of unoriented quiver theories

Bianchi¹,

Bufalini

Mancani

et al. 2020

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“…In general, H3, F3 are not flavour diagonal since fluxes through different cycles, wrapped by different D-branes, could be different. For recent discussions of mass deformed quivers and dimers see [94].…”

Section: Jhep02(2016)035mentioning

confidence: 99%

Exotic see-saw mechanism for neutrinos and leptogenesis in a Pati-Salam model

Addazi

Bianchi

Ricciardi

2016

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We discuss non-perturbative corrections to the neutrino sector, in the context of a D-brane Pati-Salam-like model, that can be obtained as a simple alternative to SO(10) GUT's in theories with open and unoriented strings. In such D-brane models, exotic stringy instantons can correct the right-handed neutrino mass matrix in a calculable way, thus affecting mass hierarchies and modifying the see-saw mechanism to what we name exotic see-saw. For a wide range of parameters, a compact spectrum of right-handed neutrino masses can occur that gives rise to a predictive scenario for low energy observables. This model also provides a viable mechanism for Baryon Asymmetry in the Universe (BAU) through leptogenesis. Finally, a Majorana mass for the neutron is naturally predicted in the model, leading to potentially testable neutron-antineutron oscillations. Combined measurements in neutrino and neutron-antineutron sectors could provide precious informations on physics at the quantum gravity scale.

“…In particular, for M 0 10 13 GeV, color sextets appear near the TeV scale, with potential implications in meson physics and at LHC, as mentioned above. On the other hand, for M 0 M S 10 TeV, a post-sphaleron scenario is possible and testable at the next generation of experiments on neutron-antineutron oscillations, with heavy color sextets, at a scale m 6 TeV that can be generated by closed-string fluxes, as shown in [33] for quiver theories and reviewed below. In this case, there is no possibility to produce the sextets at LHC, and FCNC's in the meson sector are strongly suppressed.…”

Section: Jhep06(2015)012mentioning

confidence: 99%

Neutron Majorana mass from exotic instantons in a Pati-Salam model

Addazi

Bianchi

2015

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We show how exotic stringy instantons can generate an effective interaction between color diquark sextets in a Pati-Salam model, inducing a Majorana mass term for the neutron. In particular, we discuss a simple quiver theory for a Pati-Salam like model, as an example in which the calculations of exotic instanton effects are simple and controllable. We discuss some different possibilities in order to generate n −n oscillations testable in the next generation of experiments, Majorana mass matrices for neutrini and a Post-Sphaleron Baryogenesis scenario. Connections with Dark Matter issues and the Higgs mass Hierarchy problem are discussed, in view of implications for LHC and rare processes physics. The model may be viewed as a completion of a Left-Right symmetric extension of the Standard Model, alternative to a GUT-inspired scenario. Combined measures in Neutron-Antineutron physics, FCNC, LHC, Dark Matter could rule out the proposed model or uncover aspects of physics at the Planck scale!