arXiv subjects

S. L. Lebedev

Publications and source records attributed to S. L. Lebedev.

4 recordsLinked to original sources

arXiv2005

The Radiation Reaction Effects in the BMT Model of Spinning Charge and the Radiation Polarization Phenomenon

The effect of radiation polarization attended with the motion of spinning charge in the magnetic field could be viewed through the classical theory of self-interaction. The quantum expression for the polarization time follows from the semiclassical relation $T_{QED}\sim \hbar c^{3}/μ_{B}^2ω_{c}^3$, and needs quantum explanation neither for the orbit nor for the spin motion. In our approach the polarization emerges as a result of natural selection in the ensenmble of elastically scattered electrons among which the group of particles that bear their spins in the 'right' directions has the smaller probability of radiation. The evidence of non-complete polarization degree is also obtained.

hep-th↗

arXiv2005

Self-Action Effects In the Theory of Classical Spinning Charge

The back-reaction effects for the spinning charge moving through the constant homogeneous electromagnetic field are studied in the context of the mass-shift (MS) method. For the g=2 magnetic moment case we find the (complex) addition to the classical action. Its dependence on the integrals of the unperturbed motion proves to be important in determination of the orbital radiation effects and could assist in understanding the radiation polarization (RP) phenomenon.

hep-th↗

arXiv2002

The Mass-shift Method and the Self-action of Classical Charge

The complex non-local action functional is used in classical electrodynamics to describe the back-reaction effects for the charge moving in the constant homogeneous electromagnetic field. We apply the mass-shift method to obtain the higher order radiation effects in the non-relativistic cyclotron motion and generalize the method to the case of Bargmann-Michel-Telegdi particle.

hep-th↗

arXiv2000

Vacuum Energy and Casimir Force in a Presence of Skin-depth Dependent Boundary Condition

The vacuum energy-momentum tensor (EMT) and the vacuum energy corresponding to massive scalar field on $\Re_{t}\times [0,l] \times \Re^{D-2}$ space-time with boundary condition involving a dimensional parameter ($δ$) are found. The dependent on the cavity size $l$ Casimir energy $\wt E_{C}$ is a uniquely determinable function of mass $m$, size $l$ and "skin-depth" $δ$. This energy includes the "bulk" and the surface (potential energy) contributions. The latter dominates when $l \sim δ$. Taking the surface potential energy into account is crucial for the coincidence between the derivative $-\d \wt E_{C}/\d l$ and the $ll$-component of the vacuum EMT. Casimir energy $\wt E_C$ and the bulk contribution to it are interconnected through Legendre transformation, in which the quantity $δ^{-1}$ is conjugate to the vacuum surface energy multiplied by $δ$. The surface singularities of the vacuum EMT do not depend on $l$ and, for even $D$, $δ=0$ or $\infty$, possess finite interpretation. The corresponding vacuum energy is finite and retains known analytical dependence on the dimension $D$.

hep-th↗