arXiv subjects

E. Rivas

Publications and source records attributed to E. Rivas.

4 recordsLinked to original sources

arXiv1994

Phase Diagram of An SU(2)xSU(2) Scalar-Fermion Model with Massless Decoupled Doublers

We present the phase structure of the chiral SU(2)xSU(2) scalar-fermion model on the lattice using the Zaragoza proposal for chiral fermions. The numerical result agrees with an analytic study based on the use of weak and strong Yukawa coupling expansions combined with the mean field approach. The phase diagram consits of four phases: paramagnetic(PM), ferromagnetic(FM), antiferromagnetic(AFM) and ferrimagnetic (FI). The transition lines separating these four phases intersect at one quadruple point.

hep-lat↗

arXiv1993

Phase Diagram of a Lattice $SU(2) \times SU(2)$ Scalar-Fermion Model Using the Zaragoza Fermions

We present a calculation of the phase diagram of a $SU(2) \times SU(2)$ chiral Yukawa model with massless decoupled doublers, using a saddle point approach, both for small and large Yukawa coupling. Some preliminary MonteCarlo results are also shown.

hep-lat↗

arXiv1992

On the Eichten--Preskill Proposal for Lattice Chiral Gauge Theories

We have studied the Eichten--Preskill proposal for constructing lattice chiral gauge theories using both strong and weak coupling methods. The results indicate that this proposal is unlikely to work due to a dynamical behavior similar to that of the Smit--Swift proposal, which also does not give rise to chiral fermions.

hep-lat↗

arXiv1992

Massless Decoupled Doublers: Chiral Yukawa Models and Chiral Gauge Theories

We present a new method for regularizing chiral theories on the lattice. The arbitrariness in the regularization is used in order to decouple massless replica fermions. A continuum limit with only one fermion is obtained in perturbation theory and a Golterman-Petcher like symmetry related to the decoupling of the replicas in the non-perturbative regime is identified. In the case of Chiral Gauge Theories gauge invariance is broken at the level of the regularization, so our approach shares many of the characteristics of the Rome approach.

hep-lat↗