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Lee, Chin-Aik; Shafi, Qaisar

doi:10.1016/j.physletb.2008.01.056

Cited by 6 publications

(1 citation statement)

References 34 publications

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“…It has been understood for some time that the spontaneous breaking of the Pati-Salam gauge symmetry H = SU(4) C × SU(2) L × SU(2) R (422 model) yields topologically stable monopoles that carry two quanta of Dirac magnetic charge [4][5][6]. By not insisting that H be embedded within an SO(10) model, this implies that in this model there should exist SU(3) c color singlet states that carry fractional (± e 2 ) electric charge.…”

Section: Pati-salam Modelmentioning

confidence: 99%

Magnetic monopoles and free fractionally charged states at accelerators and in cosmic rays

Kephart

Leontaris

Shafi

2017

J. High Energ. Phys.

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Unified theories of strong, weak and electromagnetic interactions which have electric charge quantization predict the existence of topologically stable magnetic monopoles. Intermediate scale monopoles are comparable with detection energies of cosmic ray monopoles at IceCube and other cosmic ray experiments. Magnetic monopoles in some models can be significantly lighter and carry two, three or possibly even higher quanta of the Dirac magnetic charge. They could be light enough for their effects to be detected at the LHC either directly or indirectly. An example based on a D-brane inspired SU(3) C × SU(3) L × SU(3) R (trinification) model with the monopole carrying three quanta of Dirac magnetic charge is presented. These theories also predict the existence of color singlet states with fractional electric charge which may be accessible at the LHC.

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Section: Pati-salam Modelmentioning

confidence: 99%

Magnetic monopoles and free fractionally charged states at accelerators and in cosmic rays

Kephart

Leontaris

Shafi

2017

J. High Energ. Phys.

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PeV scale Left–Right symmetry and baryon asymmetry of the Universe

2008

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We study the cosmology of two versions of supersymmetric Left-Right symmetric model. The scale of the B − L symmetry breaking in these models is naturally low, 10 4 − 10 6 GeV. Spontaneous breakdown of parity is accompanied by a first order phase transition. We simulate the domain walls of the phase transition and show that they provide requisite conditions, specifically, CP violating phase needed for leptogenesis. Additionally soft resonant leptogenesis is conditionally viable in the two models considered. Some of the parameters in the soft supersymmetry breaking terms are shown to be constrained from these considerations. It is argued that the models may be testable in upcoming collider and cosmology experiments.

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Intermediate left-right gauge symmetry, unification of couplings, and fermion masses in supersymmetricSO(10)×S4

Parida

2008

Phys. Rev. D

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If left-right gauge theory, SUð2Þ L Â SUð2Þ R Â Uð1Þ BÀL Â SUð3Þ C ðg L ¼ g R Þð G 2213 Þ, occurs as an intermediate symmetry in a grand unified theory then, apart from other advantages, it is possible to obtain the seesaw scale necessary to understand small neutrino masses with Majorana coupling of order unity. Barring threshold or nonrenormalizable gravitational effects at the GUT scale, or the assumed presence of additional light scalar particles of unprescribed origin, all other attempts to achieve manifest one-loop gauge coupling unification in supersymmetry SOð10Þ with such intermediate symmetry have not been successful so far. Attributing this failure to lack of flavor symmetry in the grand unified theory, we show how the spontaneous symmetry breaking of SOð10Þ Â S 4 leads to such left-right intermediate breaking scale extending over the range M R ' 5 Â 10 9 GeV to 10 15 GeV. All the charged fermion masses are fitted at the intermediate seesaw scale, M N ' M R ' 4 Â 10 13 GeV which is obtained with Majorana coupling f 0 ' 1. Using type-I seesaw and a constrained parametrization in which CP-violation originates only from the quark sector, in addition to other predictions made in the neutrino sector, the reactor mixing angle is found to be 13 ' 3 -5 which is in the range accessible to ongoing experiments. The leptonic Dirac phase turns out to be ' 2:9-3:1 radians with the predicted values of Jarlskog invariant J CP ' 2:95 Â 10 À5 À 10 À3 .

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SU(4)C×SU(2)L×

Cited by 6 publications

References 34 publications

Magnetic monopoles and free fractionally charged states at accelerators and in cosmic rays

Magnetic monopoles and free fractionally charged states at accelerators and in cosmic rays

PeV scale Left–Right symmetry and baryon asymmetry of the Universe

Intermediate left-right gauge symmetry, unification of couplings, and fermion masses in supersymmetricSO(10)×S4

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