Family unification, exotic states and light magnetic monopoles

Kephart, Thomas W.; Lee, Chin-Aik; Shafi, Qaisar

doi:10.1088/1126-6708/2007/01/088

Cited by 24 publications

(32 citation statements)

References 40 publications

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“…However, these are not the only possibilities. In all there are 18 inequivalent embeddings [18] of the standard model gauge group in SU(4) × SU(3) × SU(3). If we insist on bifundamental fermions at the 433 level, then the 433 model is only anomaly free when families come in a multiple of three.…”

Section: The 433 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: The 433 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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“…Of course, one possible model-building obstacle with large masses is that in situations with accidental global symmetries protecting the stability of the particles, higherdimension operators must be suppressed to avoid early decay. Nonetheless, many viable beyond SM (BSM) models that contain superheavy DM candidates have been proposed [52][53][54][55][56][57][58][59][60][61][62][63][64]. Given that the X particles have negligible non-gravitational interactions and minimal couplings to gravity, they can only be produced gravitationally or through initial conditions.…”

Section: Class Of Dark Matter and Inflationary Modelsmentioning

confidence: 99%

Isocurvature perturbations and non-Gaussianity of gravitationally produced nonthermal dark matter

Chung

Yoo

2013

Phys. Rev. D

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Gravitational particle production naturally occurs during the transition from the inflationary phase to the noninflationary phase. If the particles are stable and very weakly interacting, they are natural nonthermal dark matter candidates. We show that such nonthermal dark matter particles can produce local non-Gaussianities large enough to be observed by ongoing and near future experiments without being in conflict with the existing isocurvature bounds. Of particular interest is the fact that these particles can be observable through local nonGaussianities even when they form a very small fraction of the total dark matter content.

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“…Model also possess superheavy dark matter candidates (see, e.g., [61][62][63][64][65][66][67][68][69][70][71]). Since there are many scalar field degrees of freedom in typical BSMs, the possibility of identifying one of these scalars with σ is also plausible.…”

Section: Fermion Isocurvature Modelmentioning

confidence: 99%

Fermionic isocurvature perturbations

2015

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Isocurvature perturbations in the inflationary literature typically involve quantum fluctuations of bosonic field degrees of freedom. In this work, we consider isocurvature perturbations from fermionic quantum fluctuations during inflation. When a stable massive fermion is coupled to a non-conformal sector different from the scalar metric perturbations, observably large amplitude scale invariant isocurvature perturbations can be generated. In addition to the computation of the isocurvature two-point function, an estimate of the local non-Gaussianities is also given and found to be promising for observations in a corner of the parameter space. The results provide a new class of cosmological probes for theories with stable massive fermions. On the technical side, we explicitly renormalize the composite operator in curved spacetime and show that gravitational Ward identities play an important role in suppressing certain contributions to the fermionic isocurvature perturbations.

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Family unification, exotic states and light magnetic monopoles

Cited by 24 publications

References 40 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

Isocurvature perturbations and non-Gaussianity of gravitationally produced nonthermal dark matter

Fermionic isocurvature perturbations

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