Mario Castagnino

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Olimpia Lombardi CONICETUniversidad de Buenos Aires C. Larralde 3440, 6D, 1430, Buenos Aires, Argentina. Abstract In several previous papers we have argued for a global and non-entropic approach to the problem of the arrow of time, according to which the ”arrow” is only a metaphorical way of expressing the geometrical time-asymmetry of the universe. We have(More)
In this paper we argue that the formalisms for decoherence originally devised to deal just with closed or open systems can be subsumed under a general conceptual framework, in such a way that they cooperate in the understanding of the same physical phenomenon. This new perspective dissolves certain conceptual difficulties of the einselection program but, at(More)
The term ‘decoherence’ usually refers to the quantum process that supposedly turns a pure state into a mixed state, which is diagonal in a well-defined basis. The orthodox explanation of the phenomenon is given by the so-called environment-induced decoherence (EID) approach (Zurek 1982, 1993, 2003; Paz and Zurek 2002), according to which decoherence results(More)
We introduce a ‘proper time’ formalism to study the instability of the vacuum in a uniform external electric field due to particle production. This formalism allows us to reduce a quantum field theoretical problem to a quantum-mechanical one in a higher dimension. The instability results from the inverted oscillator structure which appears in the(More)
The paper addresses the quantization of minisuperspace cosmological models by studying a possible solution to the problem of time and time asymmetries in quantum cosmology. Since General Relativity does not have a privileged time variable of the newtonian type, it is necessary, in order to have a dynamical evolution, to select a physical clock. This choice(More)