University of Coimbra

most citedAnalysis of U

_{A}

(1) symmetry-breaking and restoration effects on the scalar-pseudoscalar spectrum

65 citations

6 papers

hep-lat2005★ 27 cited

Pion mass dependence of the nucleon mass in the chiral quark soliton model

K. Goeke, J. Ossmann, P. Schweitzer +1

The dependence of the nucleon mass on the mass of the pion is studied in the framework of the chiral quark-soliton model. A remarkable agreement is observed with lattice data from…

physics.ed-ph2005★ 2 cited

Images in Christmas Balls

Eef van Beveren, Frieder Kleefeld, George Rupp

We describe light-reflection properties of spherically curved mirrors, like balls in the Christmas tree. In particular, we study the position of the image which is formed somewhere…

hep-ph2005★ 65 cited

Analysis of U $_{A}$ (1) symmetry-breaking and restoration effects on the scalar-pseudoscalar spectrum

Pedro Costa, M. C. Ruivo, C. A. de Sousa +1

We explore patterns of effective restoration of the chiral U $_{A}$ (1) symmetry using an extended three-flavor Nambu-Jona-Lasinio model that incorporates explicitly the axial anomaly…

hep-ph2005★ 17 cited

The Role of hidden ambiguities in the Linear Sigma Model with fermions

Brigitte Hiller, A. L. Mota, M. C. Nemes +2

The $U_{L} (3) \times U_{R} (3)$ Linear Sigma Model (LSM) with quark degrees of freedom is used to show that radiative corrections generate undetermined finite contributions. Their origin…

nucl-th2005

On Parametric Resonance in Quantum Many-Body System

Y. Tsue, J. da Providencia, A. Kuriyama +1

The dynamics governed by a requantized collective Hamiltonian in the coupled Lipkin model is investigated in the time-dependent variational approach with squeezed state. It is poin…

hep-ph2005★ 3 cited

Restoration of U $_{A}$ (1) symmetry and meson spectrum in hot or dense matter