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6 papers · 1 filter
Modified instanton profile effects from lattice Green functions
Ph. Boucaud, F. De Soto, A. Le Yaouanc +4
We trace here instantons through the analysis of pure Yang-Mills gluon Green functions in the Landau gauge for a window of IR momenta (0.4 GeV GeV). We present lattice…
Integrability and Quantum Phase Transitions in Interacting Boson Models
J. Dukelsky, J. M. Arias, J. E. Garcia-Ramos +1
The exact solution of the boson pairing hamiltonian given by Richardson in the sixties is used to study the phenomena of level crossings and quantum phase transitions in the integr…
The U(5)-O(6) transition in the Interacting Boson Model and the E(5) critical point symmetry
J. M. Arias, C. E. Alonso, A. Vitturi +3
The relation of the recently proposed E(5) critical point symmetry with the interacting boson model is investigated. The large-N limit of the interacting boson model at the critica…
Quantum Phase Transitions in the Interacting Boson Model: Integrability, level repulsion and level crossing
J. M. Arias, J. Dukelsky, J. E. Garcia-Ramos
We study the quantum phase transition mechanisms that arise in the Interacting Boson Model. We show that the second-order nature of the phase transition from U(5) to O(6) may be at…
Quark propagator and vertex: systematic corrections of hypercubic artifacts from lattice simulations
Ph. Boucaud, F. de Soto, J. P. Leroy +5
This is the first part of a study of the quark propagator and the vertex function of the vector current on the lattice in the Landau gauge and using both Wilson-clover and overlap…
Phase transitions and critical points in the rare-earth region
J. E. Garcia-Ramos, J. M Arias, J. Barea +1
A systematic study of isotope chains in the rare--earth region is presented. For the chains (144-154)Nd, (146-160)Sm, (148-162)Gd, and (150-166)Dy, energy levels, E2 transition rat…