830 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of Puerto Rico SystemPR61 papers
- Arcetri Astrophysical ObservatoryIT31 papers
- University of TorontoCA28 papers
- University of PennsylvaniaUS27 papers
- University of British ColumbiaCA26 papers
- Brown UniversityUS25 papers
- Cardiff UniversityGB25 papers
- University of MiamiUS25 papers
- California Institute of TechnologyUS24 papers
- Jet Propulsion LaboratoryUS24 papers
- National Institute of Astrophysics, Optics and ElectronicsMX23 papers
- Laboratoire AstroParticule et CosmologieFR22 papers
44 papers · 1 filter
Relativistic spin precession in homogeneous background fields
Yunhua Ding, Alan Kostelecky, Arnaldo J. Vargas
The Bargmann-Michel-Telegdi equation, which describes the precession of the spin of a charged Dirac particle moving in a homogeneous electromagnetic field, is generalized to includ…
Prospects for testing CPT and Lorentz symmetry with deuterium ground-state Zeeman-hyperfine transitions
Arnaldo J. Vargas
This work presents a model for testing Lorentz and CPT symmetry through sidereal-variation studies of the hyperfine-Zeeman deuterium ground-state transition frequencies. It represe…
Kinetic theory formulation of the - and -odd terms in the photon self-energy in a medium
José F. Nieves, John D. Verges
In an optically active medium, such as a plasma that contains a neutrino background, the left-handed and right-handed polarization photon modes acquire different dispersion relatio…
Model for the propagation of fermions in a Bose-Einstein condensate
José F. Nieves, Sarira Sahu
We consider the dispersion relations of fermions that propagate in the background of a scalar Bose-Einstein condensate. Some illustrative examples are discussed using simple Yukawa…
Neutrino effective potential and damping in a fermion and scalar background in the resonance region
Jose F. Nieves, Sarira Sahu
We consider the propagation of a neutrino or an antineutrino in a medium composed of fermions and scalars interacting via a Yukawa-type coupling of the form , for…
Taming the pinch singularities in the two-loop neutrino self-energy in a medium
José F. Nieves, Sarira Sahu
We consider the calculation of the thermal self-energy of a neutrino that propagates in a medium composed of fermions and scalars interacting via a Yukawa-type coupling, in the cas…
Neutrino decoherence in an electron and nucleon background
José F. Nieves, Sarira Sahu
We consider the decoherence effects in the propagation of active neutrinos due to the non-forward neutrino scattering processes in a matter background composed of electrons and nuc…
Neutrino decoherence in a fermion and scalar background
Jose F. Nieves, Sarira Sahu
We consider the decoherence effects in the propagation of neutrinos in a background composed of a scalar particle and a fermion due to the non-forward neutrino scattering processes…
Neutrino damping in a fermion and scalar background
José F. Nieves, Sarira Sahu
We consider the propagation of a neutrino in a background composed of a scalar particle and a fermion using a simple model for the coupling of the form . In the pres…
Neutrino effective potential in a fermion and scalar background
José F. Nieves, Sarira Sahu
We consider the neutrino self-energy in a background composed of a scalar particle and a fermion using a simple model for the coupling of the form . The results are…
Neutrino propagation in an electron background with an inhomogeneous magnetic field
Jose F. Nieves, Sarira Sahu
We study the electromagnetic coupling of a neutrino that propagates in a two-stream electron background medium. Specifically, we calculate the electromagnetic vertex function for a…
Neutrino dispersion relation in a magnetized multi-stream matter background
Jose F. Nieves, Yaithd D. Olivas, Sarira Sahu
We study the propagation of a neutrino in a medium that consists of two or more thermal backgrounds of electrons and nucleons moving with some relative velocity, in the presence of…
Chiral spin-3/2 particles in a medium
José F. Nieves, Sarira Sahu
We consider the propagation of a chiral spin-3/2 particle in a background medium using the Thermal Field Theory (TFT) method, in analogy to the cases of a spin-1/2 fermion (e.g., a…
Electromagnetic annihilation into charged leptons and scattering off nucleons of spin-3/2 Majorana particles
José F. Nieves, Sarira Sahu
We compute the cross section for the electromagnetic annihilation into charged leptons, and the electromagnetic scattering off nucleons, of spin-3/2 self-conjugate (Majorana) parti…
Electromagnetic properties of spin-3/2 Majorana particles
Jose F Nieves
The structure of the electromagnetic vertex function of spin-3/2 particles is analyzed in a general way, for the diagonal and off-diagonal couplings, of charged as well as neutral…
Thermal Field Theory in a layer: Applications of Thermal Field Theory methods to the propagation of photons in a two-dimensional electron sheet
Jos'e F. Nieves
We apply the Thermal Field Theory methods to study the propagation of photons in a plasma layer, that is a plasma in which the electrons are confined to a two-dimensional plane she…
Angular momentum non-conserving decays in isotropic media
José F. Nieves, Palash B. Pal
Various processes that are forbidden in the vacuum due to angular momentum conservation can occur in a medium that is isotropic and does not carry any angular momentum. We illustra…
Lorentz-symmetry violating decays in a medium
José F. Nieves, Palash B. Pal
Various decay processes, such as the decay of a spin-1 particle into two photons or the gravitational decay of a spin-1/2 fermion, are forbidden in the vacuum by a combination of r…
Perturbative vs Schwinger-propagator method for the calculation of amplitudes in a magnetic field
Jose F. Nieves, Palash B. Pal
We consider the calculation of amplitudes for processes that take place in a constant background magnetic field, first using the standard method for the calculation of an amplitude…
Gravitational decay of the Z-boson
Jose F. Nieves, Palash B. Pal
We study the decay process of the Z boson to a photon and a graviton. The most general form of the on-shell amplitude, subject to the constraints due to the conservation of the ele…
Electromagnetic effects of neutrinos in an electron gas
Jose' F. Nieves, Sarira Sahu
We study the electromagnetic properties of a system that consists of an electron background and a neutrino gas that may be moving or at rest, as a whole, relative to the background…
Nucleon contribution to the induced charge of neutrinos in a matter background and a magnetic field
Jose F. Nieves
We study the nucleon contribution to the electromagnetic vertex function of neutrinos that propagate in a matter background in the presence of a magnetic field. Starting from the o…
The electromagnetic vertex of neutrinos in an electron background and a magnetic field
Jose F. Nieves
We study the electromagnetic vertex function of a neutrino that propagates in an electron background in the presence of a static magnetic field. The structure of the vertex functio…
Generalized Fierz identities
Jose F. Nieves, Palash B. Pal
Low energy weak interactions calculations with fermions frequently involve a superposition of quartic products of Dirac spinors, in which the order of the spinors is not the same i…