The concept of correlated density and its application

TL;DR

This paper explores the concept of correlated density across various physical systems, its role in phenomena like superconductivity, and how it can be measured through bulk experiments such as NMR, supported by a nonlocal kinetic theory.

Contribution

It introduces a unified view of correlated density in different systems and demonstrates how bulk measurements can access this property, supported by a quantum statistical nonlocal kinetic theory.

Findings

Correlated density influences the Bernoulli potential in superconductors.

Bulk NMR measurements can access the correlated density.

Recent experimental results are explained and new experiments are proposed.

Abstract

The correlated density appears in many physical systems ranging from dense interacting gases up to Fermi liquids which develop a coherent state at low temperatures, the superconductivity. One consequence of the correlated density is the Bernoulli potential in superconductors which compensates forces from dielectric currents. This Bernoulli potential allows to access material parameters. Though within the surface potential these contributions are largely canceled, the bulk measurements with NMR can access this potential. Recent experiments are explained and new ones suggested. The underlying quantum statistical theory in nonequilibrium is the nonlocal kinetic theory developed earlier.