Symmetry breaking and charge operator in SU(9) grand-unification models

1986 ◽  
Vol 33 (1) ◽  
pp. 260-272
Author(s):  
Kyungsik Kang ◽  
Chung Ku Kim ◽  
Jae Kwan Kim
Keyword(s):  
Symmetry Breaking ◽  
Grand Unification ◽  
Charge Operator

scholarly journals LHC Probes of TeV-Scale Scalars in SO(10) Grand Unification

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Ufuk Aydemir ◽  
Tanumoy Mandal
Keyword(s):  
Scalar Field ◽  
Gauge Symmetry ◽  
Symmetry Breaking ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Gluon Fusion ◽  
Grand Unification ◽  
Gauge Bosons ◽  
The Standard Model ◽  
Last Stage

We investigate the possibility of TeV-scale scalars as low energy remnants arising in the nonsupersymmetric SO(10) grand unification framework where the field content is minimal. We consider a scenario where the SO(10) gauge symmetry is broken into the gauge symmetry of the Standard Model (SM) through multiple stages of symmetry breaking, and a colored and hypercharged scalar χ picks a TeV-scale mass in the process. The last stage of the symmetry breaking occurs at the TeV-scale where the left-right symmetry, that is, SU(2)L⊗SU(2)R⊗U(1)B-L⊗SU(3)C, is broken into that of the SM by a singlet scalar field S of mass MS~1 TeV, which is a component of an SU(2)R-triplet scalar field, acquiring a TeV-scale vacuum expectation value. For the LHC phenomenology, we consider a scenario where S is produced via gluon-gluon fusion through loop interactions with χ and also decays to a pair of SM gauge bosons through χ in the loop. We find that the parameter space is heavily constrained from the latest LHC data. We use a multivariate analysis to estimate the LHC discovery reach of S into the diphoton channel.

scholarly journals Cosmic strings and superstrings

2010 ◽  
Vol 466 (2115) ◽  
pp. 623-657 ◽  
Author(s):  
Edmund J. Copeland ◽  
T. W. B. Kibble
Keyword(s):  
Field Theory ◽  
String Theory ◽  
Symmetry Breaking ◽  
Cosmic Strings ◽  
Grand Unification ◽  
Brane Inflation ◽  
Fundamental String ◽  
History Of ◽  
M Theory ◽  
The Universe

Cosmic strings are predicted by many field-theory models, and may have been formed at a symmetry-breaking transition early in the history of the universe, such as that associated with grand unification. They could have important cosmological effects. Scenarios suggested by fundamental string theory or M-theory, in particular the popular idea of brane inflation, also strongly suggest the appearance of similar structures. Here we review the reasons for postulating the existence of cosmic strings or superstrings, the various possible ways in which they might be detected observationally and the special features that might discriminate between ordinary cosmic strings and superstrings.

AN E6 INVARIANT ACTION LEADING TO AN SU(5) GRAND UNIFICATION ON A DOMAIN WALL

2009 ◽  
Vol 24 (18n19) ◽  
pp. 3316-3326
Author(s):  
KAMESHWAR C. WALI
Keyword(s):  
Domain Wall ◽  
Symmetry Breaking ◽  
Recent Work ◽  
Gauge Boson ◽  
Grand Unification ◽  
Invariant Action ◽  
Wall Formation ◽  
Domain Wall Solution

The paper presents a summary of some recent work on a SU(5) grand unification scheme for effective 3 + 1 dimensional fields dynamically localized on a domain-wall brane. This is achieved through the confluence of the clash-of-symmetries mechanism for symmetry breaking through domain-wall formation and the Dvali-Shifman gauge boson localization idea. It is shown that it requires an E6 invariant action, yielding a domain-wall solution that has E6 broken to differently embedded SO(10) ⊗ U(1) subgroups in the two bulk regions on the opposites of the wall.

SO(10) grand unification with a low-energy SU(2)R-symmetry-breaking scaleMR

1993 ◽  
Vol 70 (21) ◽  
pp. 3189-3192 ◽  
Author(s):  
N. G. Deshpande ◽  
E. Keith ◽  
T. G. Rizzo
Keyword(s):  
Symmetry Breaking ◽  
Low Energy ◽  
Grand Unification ◽  
R Symmetry

EQUATION OF STATE AND TEMPERATURE OF MASSIVE NONRELATIVISTIC BOSONS ARISING IN THE UNIVERSE AT THE FIRST STAGE OF REHEATING

1995 ◽  
Vol 10 (40) ◽  
pp. 3069-3076 ◽  
Author(s):  
I. DYMNIKOVA ◽  
M. KRAWCZYK
Keyword(s):  
Phase Transitions ◽  
Equation Of State ◽  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Bose Condensate ◽  
Grand Unification ◽  
De Sitter ◽  
Model Independent ◽  
Ideal Quantum ◽  
The Universe

We consider heavy nonrelativistic bosons with masses M~MGUT which arise in the Universe during phase transitions with spontaneous symmetry breaking at the grand unification scale. In the frame of statistical mechanics approach with model-independent description of cosmological background we show that the process of emerging of massive GUT bosons looks like evaporation of a Bose condensate. First massive nonrelativistic bosons behave like ideal quantum degenerate Bose gas which has the Gibbons-Hawking temperature due to the presence of the de Sitter event horizon.

Symmetry-breaking mass scales and fermion mass relations in SU(8) grand unification

1982 ◽  
Vol 26 (11) ◽  
pp. 3195-3211 ◽  
Author(s):  
F. Bordi ◽  
R. Holman ◽  
C. W. Kim
Keyword(s):  
Symmetry Breaking ◽  
Grand Unification ◽  
Fermion Mass

scholarly journals RENORMALIZATION GROUP AND GRAND UNIFICATION WITH 331 MODELS

2007 ◽  
Vol 22 (10) ◽  
pp. 1849-1874 ◽  
Author(s):  
RODOLFO A. DIAZ ◽  
D. GALLEGO ◽  
R. MARTINEZ
Keyword(s):  
Renormalization Group ◽  
Symmetry Breaking ◽  
Group Analysis ◽  
Coupling Constants ◽  
Grand Unification ◽  
Renormalization Group Analysis ◽  
Running Coupling ◽  
The Standard Model ◽  
Split Supersymmetry ◽  
Breaking Scale

By making a renormalization group analysis we explore the possibility of having a 331 model as the only intermediate gauge group between the standard model and the scale of unification of the three coupling constants. We shall assume that necessarily there is no group of grand unification at the scale of convergence of the couplings. With this scenario, different 331 models and their corresponding supersymmetric versions are considered, and we find the versions that allow the symmetry breaking described above. Besides, the allowed interval for the 331 symmetry breaking scale, and the behavior of the running coupling constants are obtained. It is worth saying that some of the supersymmetric scenarios could be natural frameworks for split supersymmetry. Finally, we look for possible 331 models with a simple group at the grand unification scale that could fit the symmetry breaking scheme described above.

scholarly journals Grand unification models from SO(32) heterotic string

2020 ◽  
Vol 35 (32) ◽  
pp. 2050198
Author(s):  
Jihn E. Kim
Keyword(s):  
Symmetry Breaking ◽  
Gauge Group ◽  
Heterotic String ◽  
Grand Unification ◽  
Yukawa Couplings ◽  
Supersymmetric Version ◽  
Phenomenological Studies ◽  
Visible Sector ◽  
Tensor Representations ◽  
Spinor Representations

Grand unification groups (GUTs) are constructed from SO(32) heterotic string via [Formula: see text] orbifold compactification. So far, most phenomenological studies from string compactification relied on [Formula: see text] heterotic string, and this invites the SO(32) heterotic string very useful for future phenomenological studies. Here, spontaneous symmetry breaking is achieved by Higgsing of the antisymmetric tensor representations of SU[Formula: see text]. The anti-SU[Formula: see text] presented in this paper is a completely different class from the flipped-SU[Formula: see text]’s from the spinor representations of SO[Formula: see text]. Here, we realize chiral representations: [Formula: see text] for a SU(9) GUT and [Formula: see text] for a SU(5)[Formula: see text] GUT. In particular, we confirm that the non-Abelian anomalies of SU(9) gauge group vanish and hence our compactification scheme achieves the key requirement. We also present the Yukawa couplings, in particular for the heaviest fermion, [Formula: see text], and lightest fermions, neutrinos. In the supersymmetric version, we present a scenario how supersymmetry can be broken dynamically via the confining gauge group SU(9). Three families in the visible sector are interpreted as the chiral spectra of SU[Formula: see text] GUT.

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