O jeito de Antonio Carlos Viana matar lagartas

Universidade Federal de São Carlos

Universidade Federal de São Carlos

Exact solution and finite size properties of the U q [osp(2|2m)] vertex models Abstract We have diagonalized the transfer matrix of the U q [osp(2|2m)] vertex model by means of the algebraic Bethe ansatz method for a variety of grading possibilities. This allowed us to investigate the thermodynamic limit as well as the finite size properties of the corresponding spin chain in the massless regim...

Artur Avila and Marcelo Viana

We exhibit an explicit sufficient condition for the Lyapunov exponents of a linear cocycle over a Markov map to have multiplicity 1. This builds on work of Guivarc’h-Raugi and Gol’dsheid-Margulis, who considered products of random matrices, and of Bonatti-Viana, who dealt with the case when the base dynamics is a subshift of finite type. Here the Markov structure may have infinitely many symbol...

Anurofauna de uma mata ciliar no município de São Carlos, estado de São Paulo, Brasil

We surveyed anuran amphibians in a riparian forest fragment of the Córrego do Espraiado, located at the Universidade Federal de São Carlos, Municipality of São Carlos, state of São Paulo, southeastern Brazil. During March 2009 and February 2010 we did weekly surveys in which we recorded 13 anuran species. The species showed a seasonal reproductive activity. In addition, we found a positive corr...

M.J. Martins and C.S. Melo Universidade Federal de São Carlos

The Bethe ansatz approach for factorizable centrally extended su(2|2) S-matrices Abstract We consider the Bethe ansatz solution of integrable models interacting through factor-ized S-matrices based on the central extention of the su(2|2) symmetry. The respective su(2|2) R-matrix is explicitly related to that of the covering Hubbard model through a spectral parameter dependent transformation. Th...