Buscar
Mostrando ítems 81-90 de 3799
ON FERMION MASSES and MIXING IN A MODEL WITH A(4) SYMMETRY
(World Scientific Publ Co Pte Ltd, 2012-05-10)
In a recently proposed multi-Higgs extension of the standard model in which discrete symmetries, A(4) and Z(3) are imposed we show that, after accommodating the fermion masses and the mixing matrices in the charged currents, ...
Three-Higgs-doublet model with A(4) symmetry
(Elsevier B.V., 2011-03-14)
We worked out in detail the three-Higgs-doublet extension of the standard model when the A(4) symmetry, which is imposed to solve the flavor problem, is extended to the scalar sector. The three doublets may be related to ...
The flavor problem and discrete symmetries
(Elsevier B.V., 2009-04-20)
In this Letter we propose a multi-Higgs extension of the standard model with Abelian and non-Abelian discrete symmetries in which the mass matrices of the charged fermions obtained from renormalizable interactions are ...
Gravitation and the local symmetry group of space-time
(Kluwer Academic/plenum Publ, 2002-04-01)
According to general relativity, the interaction of a matter field with gravitation requires the simultaneous introduction of a tetrad field, which is a field related to translations, and a spin connection, which is a field ...
Gauging U(1) symmetries and the number of right-handed neutrinos
(Elsevier B.V., 2009-05-04)
In this Letter we consider that assuming: (a) that the only left-handed neutral fermions are the active neutrinos, (b) that B - L is a gauge symmetry, and (c) that the L assignment is restricted to the integer numbers, the ...
Soliton spectrum of integrable models with local symmetries
(2002-07-01)
The soliton spectrum (massive and massless) of a family of integrable models with local U(1) and U(1) ⊗U(1) symmetries is studied. These models represent relevant integrable deformations of SL(2,ℝ) ⊗U(1) n-1-WZW and SL(2,ℝ) ...
Comments on regularization ambiguities and local gauge symmetries
(World Scientific Publ Co Pte Ltd, 2005-08-20)
We study the regularization ambiguities in an exact renormalized (1 + 1)-dimensional field theory. We show a relation between the regularization ambiguities and the coupling parameters of the theory as well as their role ...
Pseudospin and spin symmetries in 1+1 dimensions: the case of the Coulomb potential
(Elsevier B.V., 2015-05-01)
The problem of fermions in 1+1 dimensions in the presence of a pseudoscalar Coulomb potential plus a mixing of vector and scalar Coulomb potentials which have equal or opposite signs is investigated. We explore all the ...
Coalescence, deformation and Bäcklund symmetries of Painlevé IV and II equations
(2020-11-01)
We extend Painlevé IV model by adding quadratic terms to its Hamiltonian obtaining two classes of models (coalescence and deformation) that interpolate between Painlevé IV and II equations for special limits of the underlying ...
Gauge symmetry origin of Bäcklund transformations for Painlevé equations
(2021-05-01)
We identify the self-similarity limit of the second flow of sl(N)mKdVhierarchy with the periodic dressing chain thus establishing a connection to A(1) N-1 invariant Painlev'e equations. The A(1) N-1 Bcklund symmetries of ...