Zur Beschreibung relativistischer Teilchen höheren Spins im elektromagnetischen Feld / The Description of Relativistic Particles with Arbitrary Spin in the Electromagnetic Field,

1972 ◽  
Vol 27 (2) ◽  
pp. 339-362
Author(s):  
Wolfgang Ulrici
Keyword(s):  
Electromagnetic Field ◽  
Wave Equation ◽  
Center Of Mass ◽  
Arbitrary Spin ◽  
Canonical Representation ◽  
Mass Motion ◽  
Homogeneous Electromagnetic Field ◽  
Spinor Representations ◽  
Special Case ◽  
Relativistic Particles

AbstractStarting with the equations of the center-of-mass motion and spin motion of a particle in a homogeneous electromagnetic field, we derive the Hamiltonian and the wave equation of a relativistic particle with arbitrary spin and arbitrary magnetic moment in this field. We change from the canonical representation to spinor representations with convenient transformation properties, and we find a form of the wave equation which, for the special case of spin 1/2, coincides with the Dirac equation (in the form first given by Feynman). The problems and limitations of this derivation are extensively discussed.

ATOMIC VELOCITY SELECTION BY INTERFERENCE IN TWO-PHOTON IONIZATION

1996 ◽  
Vol 05 (04) ◽  
pp. 911-919
Author(s):  
J.C. GARREAU ◽  
D. WILKOWSKI ◽  
D. HENNEQUIN ◽  
V. ZEHNLÉ
Keyword(s):  
Electromagnetic Field ◽  
Quantum Interference ◽  
Quantum Coherence ◽  
Degrees Of Freedom ◽  
Internal State ◽  
Center Of Mass ◽  
Mass Motion ◽  
Two Photon ◽  
Selective Ionization ◽  
Velocity Selection

This paper discusses a new scheme for generating quantum coherence between different degrees of freedom of an atom interacting with two modes of the electromagnetic field. The presence of quantum interference in a two-photon coupling between the ground state of the atom and the continuum through two quasi-resonant intermediate states induces selective ionization of the atoms for particular combinations of the different parameters characterizing the degrees of freedom of the system, leading to quantum coherence between the internal state, the center-of-mass motion of the atom, and the electromagnetic field. The application of this method to the selection of an atomic velocity class is discussed.

NUCLEON IN NUCLEAR MEDIUM

2009 ◽  
Vol 18 (05n06) ◽  
pp. 1166-1175
Author(s):  
SHASHIKANT C. PHATAK
Keyword(s):  
Standard Procedure ◽  
Center Of Mass ◽  
Critical Density ◽  
Magnetic Interaction ◽  
Nuclear Medium ◽  
Mass Motion ◽  
Field Equations ◽  
Dielectric Model ◽  
Chiral Color Dielectric Model

The behavior of a nucleon in nuclear medium is discussed in Chiral Color Dielectric Model. It is assumed that the nucleons in nuclear medium produces a background dielectric field and the quark and dielectric field equations are solved self consistantly in presence of the dielectric field. A nucleon in nuclear medium is then constructed by means of standard procedure followed in chiral bag models. The corrections due to center of mass motion, color magnetic interaction and meson interaction are included. The calculations show that the nucleon becomes bigger in the medium but its mass does not change much. It is found that beyond a certian density, bound solutions in which quarks are bound in self-generated dielectric field are not possible. Thus, the calculations indicate that there is a critical density beyond which the matter consists of deconfined quarks.

Observables for Massive Relativistic Particles of Arbitrary Spin

1969 ◽  
Vol 10 (10) ◽  
pp. 1869-1874 ◽  
Author(s):  
J. A. de Azcárraga ◽  
L. Oliver
Keyword(s):  
Arbitrary Spin ◽  
Relativistic Particles

Spontaneous emission in a standing-wave cavity: Classical center-of-mass motion

1992 ◽  
Vol 46 (11) ◽  
pp. 7162-7178 ◽  
Author(s):  
W. Ren ◽  
J. D. Cresser ◽  
H. J. Carmichael
Keyword(s):  
Standing Wave ◽  
Spontaneous Emission ◽  
Center Of Mass ◽  
Mass Motion
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