Speaker
Description
The electric dipole polarizability of finite nuclei constitutes a sensitive low-energy probe of the isovector sector of the nuclear equation of state. In this contribution, we discuss its role in constraining neutron-rich matter across nuclear and astrophysical scales. High-precision measurements of dipole polarizability in neutron-rich nuclei provide access to the density dependence of the symmetry energy, thereby constraining its slope parameter and key neutron-star observables, including radii and tidal deformabilities. When considered in conjunction with multimessenger information from pulsars and binary neutron-star mergers, these nuclear constraints contribute to a more coherent description of the equation of state over a broad range of densities. We further present a complementary universal-relation framework in which dipole polarizability is connected to the compactness of canonical neutron stars through the dimensionless quantity $\zeta = \beta_{1.4}\tilde{L}^{-1}$. Within this framework, finite-nucleus dipole information can be mapped onto equation-of-state-insensitive constraints on the neutron-star radius $R_{1.4}$ and the symmetry-energy slope parameter $L$. Consequently, electric dipole polarizability emerges as a key nuclear observable with direct relevance for neutron-star structure and dense-matter constraints in the multimessenger era.