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Print version ISSN 0103-9733On-line version ISSN 1678-4448
Braz. J. Phys. vol.35 no.2b São Paulo June 2005
Second internatinal workshop dice 2004 - contributed papers
These proceedings are based on the Invited Lectures and Contributed Papers of the Second International Workshop on Decoherence, Information, Complexity and Entropy - DICE 2004, which was held at Castello di Piombino (Tuscany), September 1-4, 2004.
The aim of these proceedings is to document the stimulating exchange of ideas at this interdisciplinary workshop and to share it with the wider physics community. It successfully continued where DICE 2002 left . This time, there were united more than sixty participants from more than a dozen different countries. Discussions under the wider theme "From Emergent Classicality to Emergent Quantum Mechanics" took place in a very pleasant and productive atmosphere, concerning the diverse yet strongly overlapping topics
Quantum Information, Decoherence and the Quantum-to-Classical Transition
Gravity, Cosmology and the ''Problems of Time'' - Implications for Quantum Theory
Interpretations and Extension of Quantum Theory
Emergent Quantum Theory
The, by now, traditional public opening lecture was given by M. Maggiore (Université Genève), ''L'esplorazione dell'Universo con le onde gravitazionali: dai buchi neri al Big Bang'', keeping the enthusiastic audience captivated during the first evening, and the speaker busy in the following question-and-answer session. This lecture, as well as those by J. B. Hartle (University of California and ITP, Santa Barbara), ''Generalizing quantum mechanics for quantum gravity'', and by K. V. Kuchar (University of Utah), ''Spacetime diffeomorphisms and history action in general relativity'', unfortunately, cannot be reproduced here. However, the invited lecture by T. Padmanabhan (IUCAA, India), which could not be given, is fortunately fully included.
Co-organizers of this workshop have been S. Boccaletti (Firenze), H.-T. Elze (Rio de Janeiro, chair), J. Halliwell (London), L. Diosi (Budapest), L. Fronzoni (Pisa), and G. Vitiello (Salerno). Our excellent conference secretary has been M. Pesce-Rollins (Pisa).
Several institutions and sponsors generously supported the workshop and their representatives are deeply thanked: Dott. G. Anselmi (Sindaco della città di Piombino), Dott. O. Dell'Omodarme (Assessore alle Politiche Culturali del Comune di Piombino), Avv. L. Barsotti (Presidente della Fondazione Cassa di Risparmi di Livorno), Dott. G. Magnoni (Consigliere della Fondazione Cassa di Risparmi di Livorno), and L. Pesce (Vitrium Galleria, Populonia). Funds made available by Universitá di Pisa (Centro Interdisciplinare per lo Studio dei Sistemi Complessi - CISSC, and Domus Galilaeana) and Universitá di Salerno (Dipartimento di Fisica, and INFN - INFM) are gratefully acknowledged.
Above all, we must thank the citizens and the Comune di Piombino for hosting with wonderful hospitality also the second workshop in this series. Support by Associazione ''Amici di Populonia'' and Idearte-Cooperativa di Servizi Culturali is acknowledged. For most essential help with the local arrangements and excellent collaboration on the infrastructure, we thank Servizio Promozione Culturale di Piombino, particularly Dott. A. Falchi, Dott.ssa M. Gianfranchi, C. Boggero, L. Grilli, P. Venturi, and Arch. L. Giannoni and T. Ghini (Ufficio Beni Culturali del Comune).
The research presented at the workshop, including further developments since then, is collected in two separate volumes of the Brazilian Journal of Physics, the Contributed Papers here and separately the Invited Lectures. In the name of all participants, I would like to express our gratitude to Professor S. Salinas, chief editor, for encouraging and strongly supporting this interdisciplinary project, which reflects the latest developments in the area covered by the DICE meetings. Senhora N. M. Martin of the Brazilian Physical Society we thank warmly for her experienced advice and help with the editing process.
Rio de Janeiro and Campiglia Marittima, January 2005
 Decoherence and Entropy in Complex Systems, H.-T. Elze (ed.), Lecture Notes in Physics, Vol. 633 (Springer, Berlin, 2004).