5,593 research outputs found
Quark Mixings in and Suppression of
The quark mixing matrix is studied in depth on the basis of
superstring inspired model with global flavor symmetries.
The sizable mixings between right-handed down-type quark and colored
Higgs field potentially occur but no such mixings in up-type quark
sector. In the model the hierarchical pattern of is understood
systematically. It is shown that due to large - mixings is
naturally suppressed compared to . It is pointed out that the observed
suppression of is in favor of the presence of gauge symmetry
but not in accord with generic SU(5) GUT.Comment: 10pages with no figure, Latex fil
Non-linear relativistic diffusions
We obtain a non-linear generalization of the relativistic diffusion of
particles with spin. We discuss diffusion equations whose non-linearity is a
consequence of quantum statistics. We show that the assumptions of the
relativistic invariance and an interpretation of the solution as a probability
distribution substantially restrict the class of admissible non-linear
diffusion equations. We consider relativistic invariant as well as covariant
frame dependent diffusion equations with a drift. In the latter case we show
that there can exist stationary solutions of the diffusion equation besides the
equilibrium solution corresponding to the quantum or Tsallis distributions. We
define the relative entropy as a function of the diffusion probability and
prove that it is monotonically decreasing in time when the diffusion tends to
the equilibrium. We discuss its relation to the thermodynamic behavior of
diffusing particles.Comment: 20 pages, the version to appear in Physica
- …