Members

  • Mario A. Castagnino
  • Ignacio Gómez

Description

We developed the so called 'Self Induced Decoherence' to study the classical limit for closed quantum systems. It starts with a Hamiltonian with continuous spectrum and make used of the destructive interference appealing to the Riemann-Lebesgue theorem.

Selected papers

  • M. Castagnino and I. Gómez: "Towards a definition of the quantum ergodic hierarchy: Kolmogorov and Bernouilli system, en prensa, Chaos, Solitons and Fractals 2014.
  • I. Gómes and M. Catagnino ."On the classical limit of quantum mechanics, fundamental graininess and compatibility of chaos with the correspondence principle" Chapreos, Solitons and Fractals., en prensa, Chaos, Solitons and Fractals,. 2014.

Members

  • Roberto Laura
  • Marcelo Losada

Description

In the standard formulation of quantum mechanics each physical system has an associated Hilbert space and the porperties of the system are represented by subspaces which are closed. This makes it possible to calculate probabilities of conjunctions and probabilities of disjunctions of some properties. However, as all the properties are referring to the same time, it is not possible to form conjunctions or disjunctions of properties at different times. With the goal to overcome this difficulty; a theory of consistent stories had been developed. This theory defined a sequence of properties at different times. Our research group has been developing a research agenda on these issues. We have shown for example, that the so-called collapse postulate can be deduced from the calculation of probabilities for a composite quantum system of three parts. We also developed a formalism called Generalized Contexts (GC), which allows assigning probabilities to the combination of quantum properties that occur at different times. The GC formalism is applied to the description of physical situations of interest. The group aims to analyze the measurement process in the GC formalism.

Members

  • Rodolfo M. Id Betan
  • Carlos E. Repetto

Description

This line of research is dedicated to the study of the structure in unstable nuclei. The unstable nuclei with very short life time are rare compared the well bound nuclei that surround us. This short-live nuceli have exotic properties. These exotic nuclei are produced naturally in celestial bodies like neutron stars and they are now artificially produced in laboratories. The theoretical analysis of such systems seek to understand their properties and predict their behavior. We develop new formalisms to study such exotic nuclei.

Selected papers

  • R. M. Id Betan. Coupled-channel continuum eigenchannel basis. Phys. Lett. B 730, 18 (2014).
  • R. Id Betan, W. Nazarewicz. Alpha decay in the complex-energy shell model. Phys. Rev. C 86, 034338 (2012).
  • R. Id Betan. Exact Eigenvalues of the Pairing Hamiltonian Using Continuum Level Density. Phys. Rev. C 85, 064309 (2012).
  • R. Id Betan. Using Continuum Level Density in the Pairing Hamiltonian: BCS and Exact Solutions. Nuclear Physics A 879, 14, 2012.
  • G. G. Dussel, R. Id Betan, R. Liotta, T. Vertse. Collective excitations in the continuum. Physical Review C 80, 64311, 2009.