Among the topics are probability concepts in physics as the path to statistical mechanics, atoms in molecules, density-functional approximations for exchange and correlation, electron density and molecular similarity, probing electron dynamics with the Laplacian of the momentum density
, and applications of modern density functional theory to surfaces and interfaces.
This is made in terms of the electromagnetic momentum density
The asymptotic behavior of the components of the momentum density (7) then becomes
As a further consequence of this symmetry breaking, the electromagnetic wave solutions result in photon models having nonzero angular momentum (spin), not being deducible from conventional theory, and being due to the current density j in equations (14) and (15) which gives a contribution to the momentum density (7).
Field quantities such as mass density, momentum density
, angular momentum density
, and energy density are defined on the mesoscopic space.
From the aforementioned E-L equations the configurational material stress and the configurational material momentum density
can be derived .
Reconstruction of Momentum Density
Distribution from 2D ACAR Data via Maximum Entropy
can be interpreted as a local electromagnetic momentum density of the radiation field, with [?
Further turning to the momentum density (8) of the radiation field, relations (13)-(17) give
can be interpreted as an electromagnetic momentum density
with S denoting the Poynting vector, and
projections of the energy-momentum tensor of time density fields, which are physically observable characteristics of such fields--the energy density q (69), the momentum density [J.
Its energy density and the momentum density take quantum numerical values which, in accordance with the quantization of electron orbits, in n-th stationary orbit are