Browsing Física by Author "Castanos, O"

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Energy surfaces of algebraic models

Castanos, O; LópezMoreno, E (1996)

A procedure to study shapes and stability of algebraic models introduced by Gilmore is presented. According to the time dependent variational principle the coherent states, for algebraic models, are appropriate trial ...
Phase transitions and accidental degeneracy in nonlinear spin systems

Castanos, O; Hirsch, JG; López-Pena, R; López-Moreno, E (2005)

A characterization of phase transitions and related accidental degeneracies is presented for a general spin Hamiltonian containing linear and quadratic terms. The existence of first-, second-, and third-order phase transitions ...
Shapes and stability within the interacting boson model: effective Hamiltonians

Castanos, O; López-Moreno, E (1998)

For even-even isotope and isotone nuclei described by the interacting boson model a geometric description is found. This geometric interpretation is made in the essential parameter space determined by the catastrophe ...

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