432 citations · 472 across the 7 of their papers we have counts for
7 papers
The Stueckelberg Field
Henri Ruegg, Marti Ruiz-Altaba
In 1938, Stueckelberg introduced a scalar field which makes an Abelian gauge theory massive but preserves gauge invariance. The Stueckelberg mechanism is the introduction of new fi…
Pion Scattering Revisited
M. Ruiz-Altaba, J. L. Lucio, M. Napsuciale
Chiral Ward identities lead to consistent accounting for the sigma's width in the linear sigma model's Feynman rules. Reanalysis of pion scattering data at threshold imply a mass f…
The Linear Sigma Model at Work: Succesful Postdictions for Pion Scattering
J. L. Lucio, M. Napsuciale, M. Ruiz-Altaba
We enforce chiral Ward identities on the vertices of the linear sigma model to take into account the width of the scalar sigma, considered as a true physical resonance. We consider…
Noise in Grover's Quantum Search Algorithm
B. Pablo-Norman, M. Ruiz-Altaba
Grover's quantum algorithm improves any classical search algorithm. We show how random Gaussian noise at each step of the algorithm can be modelled easily because of the exact recu…
On the Initial Conditions for Pre-Big-Bang Cosmology
M. Borunda, M. Ruiz-Altaba
The beautiful scenario of pre-big-bang cosmology is appealling not only because it is more or less derived from string theory, but also because it separates clearly the problem of…
Comment on "Duality of x and psi in quantum mechanics" by Faraggi and Matone
J. L. Lucio, M. Ruiz-Altaba
The dual Schrodinger equation for x in terms of psi derived by Faraggi and Matone [hep-th/9606063] with techniques inspired by field theory duality can be derived almost trivially…
The q-deformed quark model: quantum isospin and q-hadrons
M. Klein-Kreisler, M. Ruiz-Altaba
We consider the possibility that the SU(2) isospin symmetry, exact in strong interactions but only approximate in nature, is in fact a quantum group. Using a doublet of q-quarks, w…