Speaker
Dr
Kristian Petrik
(Institute of Physics, Slovak Academy of Sciences)
Description
Modern and accurate observations of compact stars are invaluable sources of very important information about dense nuclear matter. One of the biggest breakthroughs in this field is definitely an experimental confirmation of the existence of very massive pulsars that brought new and very powerful constraints on all model descriptions. Our aim is to develop a relativistic energy density functional in the framework of the density dependent mean-field theory (MFT), which could be applied to dense nuclear matter as well as to compact star physics. Since a basic MFT does not take into account an exact momentum dependence and operates on the Hartree level only, we derived an advanced MFT that addresses these issues. In the first step, we extracted a momentum corrected parametrizations from the microscopic Dirac-Brueckner-Hartree-Fock (DBHF) data using our 2-parametric class of density functions and calculated properties of symmetric and asymmetric nuclear matter. In the second step, we created a model that reflects and properly comprises the Fock (exchange) part of the energy density of nuclear matter. This was done by mapping the Fock contributions, defined by the linear Dirac-Hartree-Fock theory, onto a density dependent MFT in a closed parameter-free form, expressed as a density functional. Preliminary calculations show promising improvements of results for the dense nuclear matter.
Primary author
Dr
Kristian Petrik
(Institute of Physics, Slovak Academy of Sciences)
