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1. Introduction
Strongly interacting matter under extreme conditions is characterized by different phases and different types of phase transitions [1]. The hadronic phase, where stable baryons build up a great part of the Universe and the entire everyday life, is a well known phase. At high temperatures and/or densities, other phases appear. For instance, at temperatures of a few MeV, chiral symmetry restoration and deconfinement transition take place, where quarks and gluons are conjectured to move almost freely within a colored phase known as the quark-gluon plasma (QGP) [2]. At low temperatures but large densities, hadronic (baryonic) matter forming compact interstellar objects such as neutron stars is indubitably observed in a conventional way, and very recently, gravitational waves from neutron star mergers have been detected, as well [3]. At higher densities, extreme interstellar objects such as quark stars are also speculated [4]. In lattice quantum chromodynamics (QCD), different orders of chiral and deconfinement transitions have be characterized, especially at low baryon densities.
The program of heavy-ion collision experiments dates back to early 1980s. Past (AGS, SIS, and SPS), current (RHIC and LHC), and future facilities (FAIR and NICA) help in answering essential questions about the thermodynamics of the strongly interacting matter and in mapping out the temperature-baryon density plane [2]. The unambiguous evidence on the formation of QGP is an example of a great empirical achievement [5, 6]. The colliding nuclei are conjectured to form a fireball that cools down by rapid expansion and finally hadronizes into individual uncorrelated hadrons. The present script focuses on the temperature-baryon density plane, concretely near the hadron-QGP boundaries, in the framework of the equilibrium thermal model [7]. To this end, we put forward a basic assumption that both directions, the hadron-QGP and QGP-hadron phases are quantum-mechanically allowed [8]. In other words, the picture drawn so far seems in fundamental conflict with the time arrow. The concept of an arrow of time prevents the reverse direction, especially if the change in the degrees of freedom or entropies aren’t following the causality principle, the second law of thermodynamics. The statistical thermal approaches work well near both deconfinement and chemical freezeout boundaries [2, 9]. This could be understood in the light of the thermal nature of an arbitrary small part of the highly entangled fireball states. Following the Eigenstate Thermalization Hypothesis [8, 10], the corresponding probability distribution of the projection of these states remains thermal. We follow the line that the thermal models reproduce well the particle yields and the thermodynamic properties of the hadronic matter including the chiral and freezeout temperatures. We compare our calculations with reliable lattice QCD simulations, an effective QCD-like approach, and available experimental results.
The present script is organized as follows. In Section 2, approaches for deconfinement and freezeout boundaries in equilibrium thermal models are introduced. The results are discussed in Section 3. Section 4 is devoted to the conclusions and outlook.
2. Equilibrium Thermal Models
It was conjectured that the formation of the hadron resonances follows the bootstrap picture, i.e., the hadron resonances or the fireballs are composed of further resonances or fireballs, which in turn are consistent of lighter resonances or smaller fireballs, and so on [11, 12]. The thermodynamic quantities of such a system can be deduced from the partition function
Likewise, the entropy and other thermodynamic quantities can be derived straightforwardly.
Both temperature
This research intends to distinguish between deconfinement and freezeout boundaries in equilibrium thermal models. The latter is characterized by
3. Results
Figure 1 depicts the freezeout and deconfinement parameters
With the experimental results, we mean the parameters obtained when measured particle yields and/or ratios are fitted to calculations based on statistical thermal models, in which the parameters
It is obvious that both sets of freezeout parameters seem identical, for instance, at low
The coexistence of different QCD phases was discussed in the literature, for instance in Refs. [55, 56]. The mixed QCD phases can be formed in macroscopic, mesoscopic, and microscopic mixtures. As shown in Figure 1, these mixed phases start being produced at
For the freezeout parameters, it is apparent that the agreement between the thermal model calculations and the experimental results is very convincing. This covers the entire
In the present calculations, full quantum statistics [13–17] and hadron resonances with masses up to 2.5 GeV [19] are taken into account. The strangeness degrees of freedom play an important role, especially at low
For the sake of completeness, we have also checked the same calculations but with the inclusion of a large number of possible missing states [57, 58]. We found that the thermodynamic quantities, especially the ones to which the present script is limited, show sensitivity to these missing states [59]. They are entering our calculations in the same manner as done for the PDG hadrons and resonances.
The missing states are resonances predicted theoretically but not yet confirmed experimentally. Their quantum numbers and physical characteristics are theoretically well known [60]. Basically, they are conjectured to greatly contribute to the fluctuations and the correlations, i.e., higher derivatives of the partition function, estimated in recent lattice QCD simulations [60]. These are the occasions where their contributions becomes unavoidable [57]. Another reason for adding the missing states is that they come up with additional degrees of freedom and considerable decay channels even to the hadrons and resonances which are subject of this present study.
For
We also find an excellent agreement between the thermal model calculations for the chemical freezeout parameters and the predictions deduced from the Polyakov linear-sigma model, especially at
This observed agreement would be taken as an evidence supporting the conclusion that the first-principle calculations likely result in the
It is in order now to highlight a few details of the linear-sigma model, which is much simpler than QCD, but based on QCD symmetries as well [63, 65–70]. Originally, it wasintended to describe the pion-nucleon interactions and the chiral degrees of freedom. A spinless scalar field
With the incorporation of the Polyakov-loop potential, the Lagrangian of the PLSM reads
The questions which arise now are why PLSM reproduces well the nonperturbative lattice QCD simulations and why the PLSM agrees well with the thermal model calculations, especially for the freezeout boundary? The first question can be directly answered. PLSM incorporates both chiral and deconfinement QCD symmetries. On the other hand, it seems that both types of transitions are nearly coincident, especially at vanishing or small baryon chemical potentials. Within this region, both calculations are in excellent agreement with each other. At high temperatures, both chiral symmetry restoration and deconfinement transition produce almost free quarks and gluons, e.g., QGP. The reliability of the chiral effective model, PLSM, seems crucial, especially where lattice field theory is unavailable or the experimental results are not accessible yet.
The second question about the reasons why PLSM agrees well with the freezeout parameters deduced from the thermal model calculations can be answered as follows. First, at
Now, it is in order to summarize some details about the two lattice QCD calculations (yellow and grey bands). [61, 62]. In Ref. [61], the crossover boundary separating the hadron gas from the quark gluon plasma phases at small baryon chemical potentials was calculated using a four times stout smeared staggered fermion action with dynamical up, down, strange, and charm quarks (
In Ref. [62], the critical temperatures of chiral crossovers at vanishing and finite values of baryon (
4. Conclusions and Outlook
Among the various phases which take place in the strongly interacting matter under extreme conditions, we focused on the deconfinement and chemical freezeout boundaries. The authors compared results on
Based on the fact that the Polyakov linear-sigma model agrees well with the lattice QCD simulations, at least within the
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Copyright © 2020 Abdel Nasser Tawfik et al. This is an open access article distributed under the Creative Commons Attribution License (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP 3 . Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. http://creativecommons.org/licenses/by/4.0/
Abstract
In different approaches, the temperature-baryon density plane of QCD matter is studied for deconfinement and chemical freezeout boundaries. Results from various heavy-ion experiments are compared with the recent lattice simulations, the effective QCD-like Polyakov linear-sigma model, and the equilibrium thermal models. Along the entire freezeout boundary, there is an excellent agreement between the thermal model calculations and the experiments. Also, the thermal model calculations agree well with the estimations deduced from the Polyakov linear-sigma model (PLSM). At low baryonic density or high energies, both deconfinement and chemical freezeout boundaries are likely coincident, and therefore, the agreement with the lattice simulations becomes excellent as well, while at large baryonic density, the two boundaries become distinguishable forming a phase where hadrons and quark-gluon plasma likely coexist.
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1 Nile University, Egyptian Center for Theoretical Physics (ECTP), Juhayna Square of 26th-July-Corridor, 12588 Giza, Egypt; Goethe University, Institute for Theoretical Physics (ITP), Max-von-Laue-Str. 1, D-60438 Frankfurt am Main, Germany
2 Faculty of Science, Physics Department, Helwan University, 11795 Ain Helwan, Egypt