Unification, proton decay, and topological defects in non-SUSY GUTs with thresholds

Chakrabortty, Joydeep; Maji, Rinku; King, Stephen F.

doi:10.1103/physrevd.99.095008

Cited by 58 publications

(54 citation statements)

References 198 publications

(232 reference statements)

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“…In this paper, we discuss topological defects in GUTs, with emphasis on SO(10) and E 6 (see also refs. [29,30] for a recent discussion on related topics). In section 2 we show the presence of a GUT monopole carrying one unit of Dirac magnetic charge in SO(10) models, which is independent of the symmetry breaking pattern.…”

Section: Jhep10(2019)193mentioning

confidence: 99%

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Monopoles, strings, and necklaces in SO(10) and E6

Lazarides

Shafi

2019

J. High Energ. Phys.

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We employ a variety of symmetry breaking patterns in SO(10) and E 6 Grand Unified Theories to demonstrate the appearance of topological defects including magnetic monopoles, strings, and necklaces. We show that independent of the symmetry breaking pattern, a topologically stable superheavy monopole carrying a single unit of Dirac charge as well as color magnetic charge is always present. Lighter intermediate mass topologically stable monopoles carrying two or three quanta of Dirac charge can appear in SO(10) and E 6 models respectively. These lighter monopoles as well as topologically stable intermediate scale strings can survive an inflationary epoch. We also show the appearance of a novel necklace configuration in SO(10) broken to the Standard Model via SU(4) c × SU(2) L × SU(2) R. It consists of SU(4) c and SU(2) R monopoles connected by flux tubes. Necklaces consisting of monopoles and antimonopoles joined together by flux tubes are also identified. Even in the absence of topologically stable strings, a monopole-string system can temporarily appear. This system decays by emitting gravity waves and we provide an example in which the spectrum of these waves is strongly peaked around 10 −4 Hz with Ω gw h 2 ≃ 10 −12. This spectrum should be within the detection capability of LISA.

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Section: Jhep10(2019)193mentioning

confidence: 99%

“…(This conclusion appears to be in disagreement with table III in ref. [30] where it is stated that the monopole is unstable. )…”

Section: So(10) Breaking Via Sumentioning

confidence: 99%

Monopoles, strings, and necklaces in SO(10) and E6

Lazarides

Shafi

2019

J. High Energ. Phys.

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“…where the branching rules of SU ( [85,86], to reproduce realistic Yukawa coupling constants of quarks and leptons [86,87], to realize gauge coupling unification [87,89], and to introduce a dark matter candidate [92,94]; an SO(10) 210 scalar field is also introduced to break SO(10) to G PS and to realize gauge coupling unification [87,89], to introduce a dark matter candidate [92,94], and to prevent rapid proton decay [95,96]. We propose a USp(32) special GUT in a 6-dimensional (6D) hybrid warped space M 4 ×T 2 /Z 2 .…”

Section: So(32) −→mentioning

confidence: 99%

Special grand unification

Yamatsu

2017

Progress of Theoretical and Experimental Physics

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We discuss new-type grand unified theories based on grand unified groups broken to their special subgroups as well as their regular subgroups. In the framework, when we construct four-dimensional (4D) chiral gauge theories, i.e., the Standard Model (SM), 4D gauge anomaly cancellation restricts the minimal number of generations of the 4D SM Weyl fermions. We show that in a six-dimensional (6D) SU (16) gauge theory on M 4 × T 2 /Z 2 one generation of the SM fermions can be embedded into a 6D bulk Weyl fermion. For the model including three chiral generations of the SM fermions, the 6D and 4D gauge anomalies on the bulk and fixed points are canceled out without exotic 4D chiral fermions. * Electronic address: yamatsu@cc.kyoto-su.ac.jp

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“…Threshold corrections [30,31] are loop level corrections arising from fields lying at and around the scale of symmetry breaking that modify the matching conditions of the gauge couplings of the models above and below the energy scale of symmetry breaking. This can in turn modify the value of M GUT and thereby save some of the models that were previously disfavored [27,[32][33][34][35][36][37][38][39]. Furthermore, since threshold corrections modify the matching conditions of the gauge couplings, they can allow for unification in models where the gauge couplings do not unify [40][41][42].…”

Section: Introductionmentioning

confidence: 99%

“…We do not take into account any restrictions on M I from neutrino masses in order to refrain from making too many assumptions about the models. This work differs significantly from recent works dealing with threshold correction [36,39,42,43] in that we consider all possible breaking chains with at most one intermediate step and treat all models in the same way. This, together with our comprehensive numerical analysis of the effect of threshold corrections, allows a simple and quantitative comparison between the plausibility of the different breaking chains.…”

Section: Introductionmentioning

confidence: 99%

Threshold effects in SO(10) models with one intermediate breaking scale

2020

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Despite the successes of the Standard Model of particle physics, it is known to suffer from a number of deficiencies. Several of these can be addressed within non-supersymmetric theories of grand unification based on $$\text {SO}(10)$$ SO ( 10 ) . However, achieving gauge coupling unification in such theories is known to require additional physics below the unification scale, such as symmetry breaking in multiple steps. Many such models are disfavored due to bounds on the proton lifetime. Corrections arising from threshold effects can, however, modify these conclusions. We analyze all seven relevant breaking chains with one intermediate symmetry breaking scale, assuming the “survival hypothesis” for the scalar masses. Two are allowed by proton lifetime and two are disfavored by a failure to unify the gauge couplings. The remaining three unify at a too low scale, but can be salvaged by various amounts of threshold corrections. We parametrize this and thereby rank the models by the size of the threshold corrections required to save them.

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Unification, proton decay, and topological defects in non-SUSY GUTs with thresholds

Cited by 58 publications

References 198 publications

Monopoles, strings, and necklaces in SO(10) and E6

Monopoles, strings, and necklaces in SO(10) and E6

Special grand unification

Threshold effects in SO(10) models with one intermediate breaking scale

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