Alfonso Queijeiro

Creation and annihilation operators, symmetry and supersymmetry of the 3D isotropic harmonic oscillator

We show that the supersymmetric radial ladder operators of the three-dimensional isotropic harmonic oscillator are contained in the spherical components of the creation and annihilation operators of the system. Also, we show that the constants of motion of the problem, written in terms of these spherical components, lead us to second-order radial operators. Further, we show that these operators change the orbital angular momentum quantum number by two units and are equal to those obtained by the Infeld–Hull factorization method.

Constants of motion, ladder operators and supersymmetry of the two-dimensional isotropic harmonic oscillator

For the quantum two-dimensional isotropic harmonic oscillator we show that the Infeld–Hull radial operators, as well as those of the supersymmetric approach for the radial equation, are contained in the constants of motion of the problem.

The general addition theorem and ladder operators

We establish a condition for obtaining differential ladder operators of functions that satisfy the general addition theorem. We show that trigonometric and hyperbolic functions fulfill this condition and give some properties and applications of these operators.

Superconducting hybrid extended objects

The equations of motion for a relativistic extended object loaded with a superconducting edge are found in terms of geometrical quantities defined on the worldsheet. The results are applied to the study of a domain wall bounded by a superconducting string. Several cases for attaining equilibrium configurations are discussed.

Effect of the W-Boson electric dipole moment in γe± → W±v

Abstract We study the possibility of observing CP -violation through the existence of an electric dipole moment of the W-boson in the process γe ± → W ± v. Such an electric dipole moment could be detected in the backward direction, without interference of magnetic and electric quadrupole moments of the W.

An equation of state for purely kinetic k-essence inspired by cosmic topological defects

We investigate the physical properties of a purely kinetic k-essence model with an equation of state motivated in superconducting membranes. We compute the equation of state parameter w and discuss its physical evolution via a nonlinear equation of state. Using the adiabatic speed of sound and energy density, we restrict the range of parameters of the model in order to have an acceptable physical behavior. We study the evolution of the scale factor and address the question of the possible existence of finite-time future singularities. Furthermore, we analyze the evolution of the luminosity distance

Effects of gauge boson compositeness in\(e\bar v_e \to W^ - Z^0 \)

\mathrm{d}_{L}

K‐essence with a Polynomial Equation of State

dL with redshift z by comparing (normalizing) it with the