24–29 Aug 2014
Hamburg University
Europe/Berlin timezone

Nuclear Enthalpies

Not scheduled
Main Building (Hamburg University)

Main Building

Hamburg University

Edmund-Siemers-Allee 1 Hamburg <a href="https://www.google.com/maps/place/Edmund-Siemers-Allee+1/@53.56303,9.98782,17z/data=!3m1!4b1!4m2!3m1!1s0x47b18f3cbed7b4f1:0xffb72ee7b0f3c774">PANIC14 venue at University Hamburg</a>
Poster 1) Quarks and gluons in hot and dense matter

Speaker

Dr Jacek Rozynek (NCNS - Warsaw, Poland)

Description

We propose to benefit from a concept of the enthalpy in order to include volume corrections to a nucleon rest energy, which are proportional to pressure and absent in a standard Relativistic Mean Field (RMF) with point-like nucleons. As a result a nucleon mass can decrease with Nuclear Matter (NM) density, making an Equation of State (EoS) softer. It is shown, how the EOS depends from nucleon sizes inside NM. The course of the EoS in our RMF model agrees with a semi-empirical estimate and is close to results obtained from extensive DBHF calculations with Bonn potential, which produce the EoS stiff enough to describe neutron star properties (mass-radius constraint) especially the masses of ``PSR J1614–2230'' and ``PSR J0348+0432'', most massiveknown neutron stars. The presented model has proper saturation properties. In particular we have shown, how nucleon volumes in compressed NM affect the nuclear compressibility at equilibrium, reducing the nucleon mass and stiffness of the EoS. The compressibility is lowered in the linear scalar-vector model to an acceptable value. The nucleon mass occurred to be pressure functional, what complements the expression for a nuclear energy in our model. It effectively corresponds to nonlinear, pressure dependent modifications of a scalar potential. Not accidentally, in the widely used standard RMF model with point-like nucleons the good compressibility is fit by nonlinear modifications of a scalar mean field with the help of two additional parameters. Thus, our results suggest to reconsider these mean field parameters. A full text in arXiv: nucl-th/1311.3591

Primary author

Dr Jacek Rozynek (NCNS - Warsaw, Poland)

Presentation materials

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