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| Author(s): |
Masayuki Oka Hase
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Física (IF/SBI) |
| Defense date: | 2005-09-21 |
| Examining board members: |
Silvio Roberto de Azevedo Salinas;
Domingos Humberto Urbano Marchetti;
Daniel Adrián Stariolo;
Alba Graciela Rivas de Theumann;
Walter Felipe Wreszinski
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| Advisor: | Silvio Roberto de Azevedo Salinas |
| Abstract | |
Exact results are established for two distinct works. The first of them is an analysis of Langevin dynamics for a mean spherical model with competiting interactions, searching for non-equilibrium phenomena as aging and the violation of the fluctuation-dissipation theorem. The second work is a contribution to the ground state\'s phase diagram of a diluted ferromagnet under a random external field obeying a bimodal distribution; an analytic study, although partial, indicates a stability of the replica-symmetric solution. (AU) | |