arXiv subjects

R. I. Khrapko

Publications and source records attributed to R. I. Khrapko.

4 recordsLinked to original sources

arXiv2002

True energy-momentum tensors are unique. Electrodynamics spin tensor is not zero

A true energy-momentum tensor is unique and does not admit an addition of a term. The true electrodynamics' energy-momentum tensor is the Maxwell-Minkowski tensor. It cannot be got with the Lagrange formalism. The canonical energy-momentum and spin tensors are out of all relation to the physical reality. The true electrodynamics' spin tensor is not equal to a zero. So, electrodynamics' ponderomotive action comprises a force from the Maxwell stress tensor and a torque from the spin tensor. A gauge non-invariant expression for the spin tensor is presented and is used for a consideration of a circularly polarized standing wave. A circularly polarized light beam carries a spin angular momentum and an orbital angular momentum. So, we double the beams angular momentum. The Beths experiment is considered.

physics.class-ph↗

arXiv2001

Violation of the gauge equivalence

F. V. Gubarev et al. (``On the significance of the vector potential squared'', Phys. Rev. Lett. 86, 2220) have argued that the vector potential itself may have physical meaning, in defiance of the gauge equivalence principle. Earlier R. I. Khrapko proposed a gauge noninvariant electrodynamics spin tensor (``Spin density of electromagnetic waves''). The standard electrodynamics spin tensor is zero. Here we point out that the Biot-Savarat formula uniquely results in a preferred, "true" vector potential field which is generated from a given magnetic field. A similar integral formula uniquely permits to find a "true" scalar potential field generated from a given electric field even in the case of a nonpotential electric field. A conception of differential forms is used. We say that an exterior derivative of a form is the boundary of this form and the integration of a form by the Biot-Savarat-type formula results in a new form named the generation. Generating from a generation yields zero. The boundary of a boundary is zero. A boundary is closed. A generation is sterile. A conjugation is considered. The conjugation converts closed forms to sterile forms and back. It permits to construct chains of forms. The conjunction differs from the Hodge star operation: the conjugation does not imply the dualization. A circularly polarized wave is considered in view of the electrodynamics spin tensor problem. A new anthropic principle is presented.

physics.gen-ph↗

arXiv2001

Rest mass or inertial mass?

Rest mass takes the place of inertial mass in modern physics textbooks. It seems to be wrong. But this phenomenon is hidden away by the facts that rest mass adherents busily call rest mass "mass", not rest mass, and the word "mass" is associated with a measure of inertia. This topic has been considered by the author in the article "What is mass?" [1, 2, 3]. Additional arguments to a confirmation of such a thesis are presented here.

physics.gen-ph↗

arXiv2001

What is mass?

Does the mass of bodies depend on their velocity? Is the mass additive if separate bodies are joined together to form a composite system? Is the mass of an isolated system conserved? Different teachers of physics and specialists give different answers to these questions because there is no general agreement on the definition of mass..We shall show that the notion of the velocity-dependent relativistic mass should be given preference over that of the rest mass.

physics.gen-ph↗