3D mesh calculations for covariant density functional theory

In contrast to non-relativistic approaches, 3Dmesh calculations with a relativistic energy density functional have met with difficulties because of the challenges of variational collapse and fermion doubling.We overcome these difficulties by developing a novel method based on the ideas of the Wilson fermion as well as the variational principle for the inverse Hamiltonian.We demonstrate the applicability of this method by applying it to ¹⁶O, ²⁴Mg, and ²⁸Si nuclei, providing a detailed explanation of the formalism and verification of numerical implementation.