10,561 research outputs found
Top quark, heavy fermions and the composite Higgs boson
We study the properties of heavy fermions in the vector-like representation
of the electro-weak gauge group with Yukawa couplings to
the standard model Higgs boson. Applying the renormalization group analysis, we
discuss the effects of heavy fermions to the vacuum stability bound and the
triviality bound on the mass of the Higgs boson. We also discuss the
interesting possibility that the Higgs particle is composed of the top quark
and heavy fermions. The bound on the composite Higgs mass is estimated using
the method of Bardeen, Hill and Lindner, 150GeV 450GeV.Comment: 10 pages and 6 figures. This paper replaces and is an extended
version of hep-ph/9602340 (published in Phys. Lett. B370(1996)201;Erratum
B382(1996)448
Partial Synchronization on Complex Networks
Network topology plays an important role in governing the collective
dynamics. Partial synchronization (PaS) on regular networks with a few
non-local links is explored. Different PaS patterns out of the symmetry
breaking are observed for different ways of non-local couplings. The criterion
for the emergence of PaS is studied. The emergence of PaS is related to the
loss of degeneration in Lyapunov exponent spectrum. Theoretical and numerical
analysis indicate that non-local coupling may drastically change the dynamical
feature of the network, emphasizing the important topological dependence of
collective dynamics on complex networks.Comment: 4 pages, 4 figure
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