Microscopic understanding of the in-medium axial coupling g_A^*

Determine whether the intrinsic in-medium axial coupling g_A^* can be understood directly as a property of how QCD symmetries are realized in dense nuclear matter.

Background

The paper discusses the longstanding quenching of the effective axial coupling in nuclear Gamow–Teller transitions, where phenomenology often indicates an effective value near 1 rather than the free-space value g_A ≃ 1.27. Modern calculations can account for much of this quenching through short-range dynamics, correlations, and consistent two-body currents, but the paper distinguishes this phenomenological accounting from a deeper explanation in terms of an intrinsic in-medium constant g_A^*. The unresolved issue is whether this quantity has a direct interpretation rooted in the realization of QCD symmetries in dense matter.