Spontaneous parity breaking, gauge coupling unification, and consistent cosmology with transitory domain walls

Borah, Debasish

doi:10.1103/physrevd.86.096003

Cited by 10 publications

(4 citation statements)

References 45 publications

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“…The symmetry breaking of SU(2) R × U(1) B−L into the U(1) Y of standard model can also be achieved at two stages by choosing a non-minimal scalar sector [56].…”

Section: Left-right Symmetric Modelmentioning

confidence: 99%

Neutrinoless double beta decay in type I+II seesaw models

Borah

Dasgupta

2015

J. High Energ. Phys.

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We study neutrinoless double beta decay in left-right symmetric extension of the standard model with type I and type II seesaw origin of neutrino masses. Due to the enhanced gauge symmetry as well as extended scalar sector, there are several new physics sources of neutrinoless double beta decay in this model. Ignoring the left-right gauge boson mixing and heavy-light neutrino mixing, we first compute the contributions to neutrinoless double beta decay for type I and type II dominant seesaw separately and compare with the standard light neutrino contributions. We then repeat the exercise by considering the presence of both type I and type II seesaw, having non-negligible contributions to light neutrino masses and show the difference in results from individual seesaw cases. Assuming the new gauge bosons and scalars to be around a TeV, we constrain different parameters of the model including both heavy and light neutrino masses from the requirement of keeping the new physics contribution to neutrinoless double beta decay amplitude below the upper limit set by the GERDA experiment and also satisfying bounds from lepton flavor violation, cosmology and colliders.

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“…The symmetry breaking of SU(2) R × U(1) B−L into the U(1) Y of standard model can also be achieved at two stages by choosing a non-minimal scalar sector [56].…”

Section: Left-right Symmetric Modelmentioning

confidence: 99%

Neutrinoless double beta decay in type I+II seesaw models

Borah

Dasgupta

2015

J. High Energ. Phys.

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“…One can then demand that the new operators ensure sufficient pressure across the domain walls that the latter disappear before Big Bang Nucleosynthesis (BBN). This requirement has been discussed in detail in [16][17][18][19]. It has also been shown that domain walls in SUSYLR can be successfully exploited for baryogenesis via leptogenesis while remaining consistent with low energy observables like the electric dipole moment of the electron, with a gravitational wave signature that can be detected in upcoming experiments [20].…”

Section: Cosmology With Intermediate Scale Domain Wallsmentioning

confidence: 93%

Gravitational wave signature of generic disappearance of $Z_2$-symmetry breaking domain walls

Banerjee¹,

Yajnik²

2023

Preprint

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Breaking of discrete parity at high scale gives rise to Z 2 -domain walls. The metastability of such walls can make them relatively long lived and contradict standard cosmology. We consider two classes of theories with similar underlying feature, the left right symmetric theories and two Higgs doublet models. These theories effectively possess two steps of breaking of Z 2 discrete symmetries. The domains formed at a high energy scale in the first step further decompose into subdomains near the electroweak scale in the second step. Then a QCD instanton induced energy difference can remove the subdomain walls as well as the domain walls successfully. This result holds regardless of whether the domain wall removal is guided by small symmetry breaking terms or purely statistical outcome of a homogeneous vacuum.We then investigate the gravitational waves arising from the collapse of such domain walls and show that the peak frequency of these waves lies in the 10 −9 -10 −7 Hz band, depending on annhilation temperatures of 10 −2 -1 GeV, which is sensitive to pulsar timing based experiments such as SKA and NANOGrav.

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“…Recently, different aspects of unification have been discussed in the context of dark matter [48][49][50][51][52][53][54][55][56][57]. The implication of domain walls in presence of left-right symmetry in SUSY framework has been studied in [58][59][60].…”

Section: Introductionmentioning

confidence: 99%

Roadmap of left-right models based on GUTs

et al. 2018

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We perform a detailed study of the grand unified theories SO (10) and E(6) with left-right intermediate gauge symmetries of the form SU (N ) L ⊗ SU (N ) R ⊗ G. Proton decay lifetime constrains the unification scale to be 10 16 GeV and, as discussed in this paper, unwanted cosmological relics can be evaded if the intermediate symmetry scale is 10 12 GeV. With these conditions, we study the renormalisation group evolution of the gauge couplings and do a comparative analysis of all possible left-right models where unification can occur. Both the D-parity conserved and broken scenarios as well as the supersymmetric (SUSY) and Non-supersymmetric (Non-SUSY) versions are considered. In addition to the fermion and scalar representations at each stage of the symmetry breaking, contributing to the β-functions, we list the intermediate left-right groups which successfully meet these requirements. We make use of the dimension-5 kinetic mixing effective operators for achieving unification and large intermediate scale. A significant result in the supersymmetric case is that to achieve successful unification for some breaking patterns, the scale of SUSY breaking needs to be at least a few TeV. In some of these cases, intermediate scale can be as low as ∼ 10 12GeV, for SUSY scale to be ∼ 30 TeV. This has important consequences in the collider searches for SUSY particles and phenomenology of the lightest neutralino as dark matter. *

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Spontaneous parity breaking, gauge coupling unification, and consistent cosmology with transitory domain walls

Cited by 10 publications

References 45 publications

Neutrinoless double beta decay in type I+II seesaw models

Neutrinoless double beta decay in type I+II seesaw models

Gravitational wave signature of generic disappearance of $Z_2$-symmetry breaking domain walls

Roadmap of left-right models based on GUTs

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