#### Filter Results:

- Full text PDF available (27)

#### Publication Year

1998

2013

- This year (0)
- Last 5 years (1)
- Last 10 years (16)

#### Publication Type

#### Co-author

#### Journals and Conferences

Learn More

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)

Following the idea that the interplay of observables and states is the fundamental ingredient of quantum mechanics 1 we have developed paper [2] where we have studied the relation of the state vectors ρ of a close isolated quantum system (that belong to a convex set of states S), to the observables O within this closed system (that belong to a space of… (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)

In this paper we argue that the emergence of the classical world from the underlying quantum reality involves two elements: self-induced decoherence and macroscopicity. Self-induced decoherence does not require the openness of the system and its interaction with the environment: a single closed system can decohere when its Hamiltonian has continuous… (More)

- Mario Castagnino, Olimpia Lombardi
- Synthese
- 2009

A general method for obtaining the decoherence time in self-induced decoherence is presented. In particular, it is shown that such a time can be computed from the poles of the resolvent or of the initial conditions in the complex extension of the Hamiltonian’s spectrum. Several decoherence times are estimated: 10−13–10−15 s for microscopic systems, and… (More)

- Mario Castagnino
- 2008

The classical-statistical limit of quantum mechanics is studied. It is proved that the limit ~ → 0 is the good limit for the operators algebra but it si not so for the state compact set. In the last case decoherence must be invoked to obtain the classical-statistical limit.

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)

- Fabián H. Gaioli, Edgardo, T. Garcia Alvarez, Mario A. Castagnino
- 2008

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)