10,712 research outputs found
Grand unification using a generalized Yang-Mills theory
Generalized Yang-Mills theories have a covariant derivative that employs both
scalar and vector bosons. Here we show how grand unified theories of the
electroweak and strong interactions can be constructed with them. In particular
the SU(5) GUT can be obtained from SU(6) with SU(5)xU(1) as a maximal subgroup.
The choice of maximal subgroup also determines the chiral structure of the
theory. The resulting Lagrangian has only two terms, and only two irreducible
representations are needed, one for fermions and another for bosons.Comment: 10 pages, no figure
Effect of hybridization on the magnetic properties of correlated two-band metals
The magnetic properties of transition-like metals are discussed within the
single site approximation, which is a picture to take into account electron
correlations. The metal is described by two hybridized bands one of which
includes Coulomb correlation. The presented results indicate that
ferromagnetism arises for adequate values of hybridization (V), correlation (U)
and occupation number(). Some similarities with Dynamical
Mean-Field Theory (DMFT) are indicated.Comment: 3 pages, 3 figures, presented at the 53rd MMM08 conference in Austin,
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