Energy-momentum tensor of a hydrogen atom: stability, D-term, and the Lamb shift

2023/09/20 by Czarnecki, Andrzej, Liu, Yizhuang, Reza, Syed Navid · 6 citations
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2309.10994

Abstract

We clarify two issues related to the so-called D-term in matrix elements of the energy-momentum tensor. First, we show that in a stable system, the D-term can have either sign, contrary to claims that it must be negative. Second, we demonstrate a logarithmic enhancement of the \mathcalα correction to the D-term in any state of the hydrogen atom. We contrast this enhancement with the Lamb shift where it is present only in S-states.

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