SEMCIÊNCIA

Via The Physics ArXiv blog : How to test the many worlds interpretation of quantum mechanics Posted:  07 Oct 2008 12:59 AM CDT The many worlds interpretation of quantum mechanics holds that before a measurement is made, identical copies of the observer exist in parallel universes and that all possible results of a measurement actually take place in these universes. Until now there has been no way to distinguish between this and the Born interpretation. This holds that each outcome of a measurement has a specific probability and that, while an ensemble of measurements will match that distribution, there is no way to determine the outcome of specific measurement. Now Frank Tipler, a physicist at Tulane University in New Orleans says he has hit upon a way in which these interpretations must produce different experimental results. His idea is to measure how quickly individual photons hitting a screen build into a pattern. According to the many worlds interpretation, this pattern should bu...

Há alguns posts atrás eu conjecturei sobre a possibilidade de que a não trivialidade de grande parte dos modelos de Física Estatística em d = 3 tivesse algo a ver com o fato de vivermos em um universo complexo também com d = 3. Este artigo abaixo vai na mesma direção. Statistical mechanics and thermodynamic limit of self-gravitating fermions in D dimensions Authors: Pierre-Henri Chavanis (Submitted on 14 Aug 2007) Abstract: We discuss the statistical mechanics of a system of self-gravitating fermions in a space of dimension $D$. We plot the caloric curves of the self-gravitating Fermi gas giving the temperature as a function of energy and investigate the nature of phase transitions as a function of the dimension of space. We consider stable states (global entropy maxima) as well as metastable states (local entropy maxima). We show that for $D\ge 4$, there exists a critical temperature (for sufficiently large systems) and a critical energy below which the system cannot be found in stati...