7 research outputs found
Relativistic Landau levels for a fermion-antifermion pair interacting through Dirac oscillator interaction
We introduce a unique model for a fermion antifermion pair interacting
through Dirac oscillator interaction in the presence of external uniform
magnetic field. In order to acquire a non perturbative energy spectrum for such
a system we solve the corresponding form of a fully covariant two body Dirac
equation. The dynamic symmetry of the system allows to study in three
dimensions and the corresponding equation leads a dimensional matrix
equation for such a static and spinless composite system. We can obtain an
exact solution of the matrix equation and arrive at a spectrum (in closed form)
in energy domain. The obtained energy spectrum shows that the composite system
that under scrutiny behaves like a single relativistic quantum oscillator. As a
result, we obtain relativistic Landau levels of a fermion antifermion pair
interacting through Dirac oscillator interaction and determine the components
of the corresponding bi-spinor. We think that our results can provide
enlightening informations about the quark antiquark systems and thus mass
formula for mesons.Comment: 1 figur
The relativistic dynamics of oppositely charged two fermions interacting with external uniform magnetic field
We investigated the relativistic dynamics of oppositely charged two fermions
interacting with an external uniform magnetic field. We chose the interaction
of each fermion with the external magnetic field in the symmetric gauge, and
obtained a precise solution of the corresponding fully-covariant two-body Dirac
equation that derived from Quantum Electrodynamics via Action principle. The
dynamic symmetry of the system we deal with allowed us to determine the
relativistic Landau levels of such a spinless composite system, without using
any group theoretical method. As a result, we determined the eigenfunctions and
eigenvalues of the corresponding two-body Dirac HamiltonianComment: 1 figur
Exact solution of an exciton energy for a monolayer medium
We present exact solutions of an energy spectrum of 2-interacting particles
in which they seem to be relativistic fermions in 2+1 space-time dimensions.
The 2x2 spinor equations of 2-interacting fermions through general central
potential were separated covariantly into the relative and center of mass
coordinates. First of all, the coupled first order differential equations
depending on radial coordinate were derived from 2x2 spinor equations. Then, a
second order radial differential equation was obtained and solved for Coulomb
interaction potential. We apply our solutions to exciton phenomena for a
free-standing monolayer medium. Since we regard exciton as isolated
2-interacting fermions in our model, any other external effect such as
substrate was eliminated. Our results show that the obtained binding energies
in our model are in agreement with the literature. Moreover, the decay time of
an exciton was found out spontaneously in our calculations.Comment: 5 page
Quasibound states for scalar field under the influence of an external magnetic field in the near-horizon geometry of the BTZ black hole with torsion
We consider a scalar field under the effect of external magnetic field in thenear-horizon geometry of the Banados-Teitelboim-Zanelli black hole with torsionand obtain quasistationary states of the system under consideration by solvingthe corresponding Klein-Gordon equation. We obtain exact solution of theequation and accordingly we arrive at a complex spectra. We observe that thereal oscillation frequency of the modes and their decay time depend on thestrength of external magnetic field besides the parameters of geometricbackground. We see that amplitude of the real oscillation modes decreases anddecay time of the modes becomes longer as the strength of the external magneticfield increases. The results indicate that the geometric background is stableunder such a perturbation field
Quasibound states for a scalar field under the influence of an external magnetic field in the near-horizon geometry of the BTZ black hole with torsion
We consider a charged scalar field under the effect of an external uniform
magnetic field in the near-horizon geometry of the Banados-Teitelboim-Zanelli
black hole with torsion and obtain quasi-stationary states of the system under
consideration through obtaining analytical solution of the corresponding
Klein-Gordon equation. We obtain the solution function of the equation and
accordingly we arrive at complex spectra. We observe that the real oscillation
frequency of the modes and their decay time depend on the strength of the
external magnetic field beside the parameters of geometric background. We see
that the amplitude of the real oscillation modes decreases and the decay time
of the modes becomes longer as the strength of the external magnetic field
increases. The results indicate that the geometric background is stable under
such a perturbation field