Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Gastão A. Braga"'
Publikováno v:
Revista Brasileira de Ensino de Física, Vol 24, Iss 4, Pp 448-454
Este trabalho trata, de maneira rigorosa, auto-contida e acessível a um aluno de graduação em física e áreas afins, do fênomeno de transição de fase num modelo de percolação de elos independentesna rede hipercúbica d-dimensional. Esses mod
Externí odkaz:
https://doaj.org/article/abf9d88bbca742e28edcb6f643aa0c9f
Publikováno v:
Multiscale Modeling & Simulation. 18:131-162
We systematically study a numerical procedure that reveals the asymptotically self-similar dynamics of solutions of partial differential equations (PDEs). This procedure, based on the renormalizati...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c0b909a36c4ebf9c752d30ffff2c8cc
https://doi.org/10.1137/18m120004x
https://doi.org/10.1137/18m120004x
Publikováno v:
Journal of Mathematical Physics. 62:083507
In this paper, we proceed with the analysis started in \cite{bib:braga-mor-souza} and, using the Renormalization Group method, we obtain logarithmic corrections to the decay of solutions for a class of nonlinear integral equations whenever the nonlin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0b9f3c15f7d0f92ffd99ba2736d1b586
https://doi.org/10.1063/5.0043505
https://doi.org/10.1063/5.0043505
Publikováno v:
Brazilian Journal of Physics. 45:64-71
A procedure, based on exact relations for the spin-spin correlation function and on rigorous correlation inequalities, is presented and used to obtain upper bounds for the critical temperature of the Ising model on the three dimensional pyrochlore la
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1ad92c5a3f635451cdb0bb0869284430
https://doi.org/10.1007/s13538-014-0296-5
https://doi.org/10.1007/s13538-014-0296-5
Autor:
Jussara M. Moreira, Gastão A. Braga
Publikováno v:
Journal of Statistical Physics. 148:280-295
In this paper we use a Renormalization Group (RG) method to study the long-time asymptotics of nonlinear diffusion equations with time-dependent diffusion coefficients and nonlinearities which are marginal (or critical) with respect to the RG operato
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::db45ce7e61d0b08078b0152ef99cf300
https://doi.org/10.1007/s10955-012-0539-1
https://doi.org/10.1007/s10955-012-0539-1
Publikováno v:
Journal of Statistical Physics. 136:195-198
In this short note we present some explicit conditions under which the Theorem of Braga et al. (J. Stat. Phys. 129:587–591, 2007) can be extended to spin-spin correlation functions of mixed short-range/long-range ferromagnetic vector spin models in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2caa5ed724ea9f0ac697180a0bc34d4c
https://doi.org/10.1007/s10955-009-9777-2
https://doi.org/10.1007/s10955-009-9777-2
Autor:
Paulo C. Lima, Gastão A. Braga
Publikováno v:
Journal of Statistical Physics. 131:1189-1193
By means of a transfer matrix method, we show that the residual entropy S of the two-dimensional square lattice antiferromagnetic Ising model in the maximal critical field satisfies (ln λn)/(n+1)≤S≤(ln λn)/n, where λn is the largest eigenvalue
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6cf15fc597fcdaae9af6cfbe5bea77df
https://doi.org/10.1007/s10955-008-9549-4
https://doi.org/10.1007/s10955-008-9549-4
Autor:
Gastão A. Braga, Paulo C. Lima
Publikováno v:
Journal of Statistical Physics. 130:571-578
By means of a transfer matrix method, we show that the residual entropy S of the two dimensional square lattice Blume-Emery-Griffiths model on the antiquadrupolar-disordered and ferromagnetic-antiquadrupolar-disordered phase boundaries satisfies the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b3c65d5c8488a1dd13899b4ebe23504d
https://doi.org/10.1007/s10955-007-9457-z
https://doi.org/10.1007/s10955-007-9457-z
Publikováno v:
Journal of Statistical Physics. 129:587-591
In this short note we consider mixed short-long range independent bond percolation models on $\Z^{k+d}$. Let $p_{uv}$ be the probability that the edge $(u,v)$ will be open. Allowing a $x,y$-dependent length scale and using a multi-scale analysis due
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::017dfbb3c592172871cb4c4f00501501
https://doi.org/10.1007/s10955-007-9347-4
https://doi.org/10.1007/s10955-007-9347-4
Publikováno v:
SIAM Review. 47:349-365
We introduce the model of independent percolation on general graphs with emphasis on the Bethe lattice, for which we prove the existence of a phase transition with the precise calculation of the critical value, and derive the value of the critical ex
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c7f5024a481dded6fe39b9b2ae1820da
https://doi.org/10.1137/s0036144503433685
https://doi.org/10.1137/s0036144503433685