Agressão física e classe social

Departamento de Física de Partículas

A brief review of the development of Chern-Simons gauge theory since its relation to knot theory was discovered in 1988 is presented. The presentation is done guided by a dictionary which relates knot theory concepts to quantum field theory ones. From the basic objects in both contexts the quantities leading to knot and link invariants are introduced and analyzed. The quantum field theory appro...

Departament Física i Enginyeria Nuclear, FIB, UPC,

1 Instituto de Física, Universidade Federal Fluminense,

It is known now that chiral symmetry restoration requires the meson-nucleon coupling to be density dependent in nuclear-matter mean-field models. We further show that quite generally, the quark and gluon condensates in medium are related to the trace of energy-momentum tensor of nuclear matter and in these models the incompressibility, K, must be less than thrice the chemical potential, μ. In t...

Departamento de Física, Universidade Federal do Piauí, 64049-550, Teresina

The zero-temperature Glauber dynamics is used to investigate the persistence probability P (t) in the Potts model with Q = 3, 4, 5, 7, 9, 12, 24, 64, 128, 256, 512, 1024, 4096, 16384,..., 230 states on directed and undirected Barabási-Albert networks and Erdös-Rényi random graphs. In this model it is found that P (t) decays exponentially to zero in short times for directed and undirected ErdösR...

Social networks and E-commerce

Social networking has become popular and raised a controversial question on its profitability and future influences. This paper is to provide a general snapshot of social networking and discuss its pros and cons. A useful method judging whether or not a company should apply the technology is presented. It is suggested in this paper that social networking is not necessarily useless or a panacea,...