Classical Physics and Quantum Loops

TL;DR

This paper explores how classical physics phenomena can emerge from quantum loop effects, challenging the traditional view that loops are purely quantum and highlighting their role in long-range interactions involving massless particles.

Contribution

It demonstrates that classical effects can originate from quantum loop contributions, clarifying the connection between classical physics and quantum field theory.

Findings

Classical effects can arise from loop diagrams in quantum field theory.

Long-range interactions involving massless particles can be explained through loop contributions.

Abstract

The standard picture of the loop expansion associates a factor of h-bar with each loop, suggesting that the tree diagrams are to be associated with classical physics, while loop effects are quantum mechanical in nature. We discuss examples wherein classical effects arise from loop contributions and display the relationship between the classical terms and the long range effects of massless particles.