Dissipation and fluctuations in elongated bosonic Josephson junctions

We investigate the dynamics of bosonic atoms in elongated Josephson junctions. We find that these systems are characterized by an intrinsic coupling between the Josephson mode of macroscopic quantum tunneling and the sound modes. This coupling of Josephson and sound modes gives rise to a damped and stochastic Langevin dynamics for the Josephson degree of freedom. From a microscopic Lagrangian, we deduce and investigate the damping coefficient and the stochastic noise, which includes thermal and quantum fluctuations. Finally, we study the time evolution of relative-phase and population-imbalance fluctuations of the Josephson mode and their oscillating thermalization to equilibrium.Comment: 9 pages, 5 figures, improved version with more detailed explanations, to be published in Phys. Rev.

Some didactical remarks upon theory of relativity and... the like

I've analized the didactical remarkes around the relativity theory. Particularly I've referred the problem of fallibility of the human knowlege like in epistemological issue of K. Popper and successive extension of the "unified theory of method" by Dario Antiseri

Escola pùblica e privada no mundo: Os sistemas escolares entre a concorrencia e a intervencao do estado

Edizione portoghese dell'omonimo testo italiano, pubblicato dall'editore Armando di Roma, nel 2001. Questo è uno studio comparativo dei sistemi scolastici europei e delle diverse politiche scolastiche che vengono applicate nelle diverse Nazioni