2 papers
physics.atom-ph2026
Resolution of the hyperfine puzzle and its significance for two fermion Dirac atoms
Gordon Baym, Glennys Farrar
The hyperfine interaction in the ground state of a hydrogen atom of assumed radius is proportional to , raising the question of why the hyperfine interaction does not l…
nucl-th2025
Generalized Beth--Uhlenbeck entropy formula from the derivable approach
David Blaschke, Gerd Röpke, Gordon Baym
We derive a generalized Beth-Uhlenbeck formula for the entropy of a dense fermion system with strong two-particle correlations, including scattering states and bound states. We wor…