Speaker
Description
Self-consistent Green's function (SCGF) simulations have been capable to provide useful insight into the structure of homogeneous nucleonic matter, in part dure to their ease in handling hard potentials and at finite temperature and in part thanks to the possibility for direct access to physical information such as response and nucleon mean free-path. There exists two different implementations of SCGF that either work directly in the thermodynamic limit or exploit discretised bases with periodic boundary conditions. This talk covers recent advances on both.
Simulations at the thermodynamic limit focus on resolving nucleon-nucleon short range correlations and are typically performed at finite temperature to avoid neutron-proton pairing instability. We proposed a new formulation of SCGF based on Nambu covariant perturbation theory that will allow embed finite temperatures, pairing and superfluidity on the same footing [1,2].
Conversely, discretised bases in periodic boundary conditions allow to exploit the more sophisticated many-body expansions that are normally employed only for finite nuclei. Within this framework, we have implemented the so-called algebraic diagrammatic construction at third order [ADC(3)] and combined it with a Gorkov 1st order pairing [3]. In contrast to previous simulations at the thermodynamic limit, particle-hole response effects can be handled also at zero temperature. A recent benchmark shows consistency of this new approach with other ab initio simulations with the same periodic boundary conditions ansatz [4].
[1] M. Drissi, A. Rios and C. Barbieri, Ann. of Phys. 469, 169729 (2024).
[2] M. Drissi, A. Rios and C. Barbieri, Ann. of Phys. 469, 169730 (2024).
[3] F. Marino, C. Barbieri and G. Colò, in preparation (2025).
[4] F. Marino, W. G. Jiang and S. J. Novario, Phys. Rev. C 110, 054322 (2024).
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