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16 papers · 1 filter
Wigner transformation for the determinant of Dirac operators
L. L. Salcedo, E. Ruiz Arriola
We use the -function regularization and an integral representation of the complex power of a pseudo differential operator, to give an unambiguous definition of the determinant o…
Effective Chiral Lagrangians with an SU(3)-Broken Vector-Meson Sector
A. Bramon, A. Grau, G. Pancheri
The accuracy of effective chiral lagrangians including vector-mesons as (hidden symmetry) gauge fields is shown to be improved by taking into account SU(3)-breaking in the vector-m…
Continuum limit of field theories regularized on a random lattice
B. Alles, M. Beccaria, L. Del Debbio +1
The continuum limit and scaling properties of an asymptotically free field theory regularized on a random lattice are compared with those on a regular square lattice. We work on ra…
Semiclassical expansions up to -order in relativistic nuclear physics
J. Caro, E. Ruiz Arriola, L. L. Salcedo
We present the first calculation of the -Wigner--Kirkwood corrections to a relativistic system of fermions in the presence of external scalar and vector potentials. The me…
Finite-Difference Equations in Relativistic Quantum Mechanics
V. Aldaya, J. Guerrero
Relativistic Quantum Mechanics suffers from structural problems which are traced back to the lack of a position operator , satisfying wit…
Pion Cloud Contribution to K+ Nucleus Scattering
C. Garcia-Recio, J. Nieves, E. Oset
A careful reanalysis is done of the contribution to nucleus scattering from the interaction of the kaon with the virtual pion cloud. The usual approximations made in the ev…