UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-23 17:44
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Conference: Bucharest University Faculty of Physics 2023 Meeting


Section: Nuclear and Elementary Particles Physics


Title:
New aspects on the entropy in relativistic and ultrarelativistic nuclear collisions


Authors:
Murat ABLAI1a, Dănuț ARGINTARU2, Marius CĂLIN1, Tiberiu EȘANU3, Alexandru JIPA1b, Ionel LAZANU1, Oana RISTEA1, Cătălin RISTEA4, Nicolae George ȚUȚURAȘ1


*
Affiliation:
1) University of Bucharest, Faculty of Physics

2) University of Civil Marine Constanta

3) „Horia Hulubei” National Institute of Nuclear Physics and Engineering Bucharest-Măgurele

4) Institute of Space Sciences Bucharest-Măgurele



E-mail
a murat.ablai@gmail.com b jipa@brahms.fizica.unibuc.ro


Keywords:
relativistic nuclear collisions, entropy, collision dynamics, genetic algorithms


Abstract:
In the efforts made for identification of the basic phases of nuclear matter and possible phase transitions, in deep correlations with the thermodynamic and hydrodynamic conditions, many ways and approaches have been considered. Considering the dependence on the thermodynamic equilibrium type for these transitions, many works proposed the entropy evaluation in each relativistic nuclear collisions, as well as the evolution of the entropy from the initial state, with maximum compression and highest temperature, to the final freeze-out state. Therefore, in the present work, authors analyse the situation and propose an analysis of the entropy evolution in a nucleus-nucleus collision at high energy, as well as a method for such analysis based on genetic algorithms and mix structure. The results have been separated in agreement with system types, non-linearity, optimization techniques, taking into account the possible influences of the different mathematical and processing operations. All these could influence the execution time and the presence of some false minima during the simulation. The main results obtained during these efforts are related to the necessity to consider a larger number of generations and introduction of some heuristic components to prevent the local minima. The study is still in work.


Acknowledgement:
This work was performed in the frame of the grant nr. FAIR_08/17.11.2020 „Strangeness, nuclear matter flow and possible connections with cosmological scenarios at CBM”/STRAFLOW@CBM. Many thanks for this opportunity.