scholarly journals Examination of directed flow as a signal for a phase transition in relativistic nuclear collisions

2014 ◽  
Vol 89 (5) ◽  
Author(s):  
J. Steinheimer ◽  
J. Auvinen ◽  
H. Petersen ◽  
M. Bleicher ◽  
H. Stöcker
Keyword(s):  
Phase Transition ◽  
Directed Flow ◽  
Nuclear Collisions ◽  
Relativistic Nuclear Collisions

Evidence of deconfinement phase transition in multiparticle production in relativistic nuclear collisions

2014 ◽  
Vol 23 (03) ◽  
pp. 1450016 ◽  
Author(s):  
Arshad Kamal ◽  
Shakeel Ahmad ◽  
N. Ahmad ◽  
M. Irfan
Keyword(s):  
Phase Transition ◽  
Monte Carlo ◽  
Simulated Data ◽  
Fractal Dimensions ◽  
Data Sets ◽  
Specific Heats ◽  
Nuclear Collisions ◽  
Deconfinement Phase Transition ◽  
Relativistic Nuclear Collisions ◽  
Generalized Dimensions

This paper presents the results of an investigation pertaining to multifractal structure, degree of multifractality and occurrence of deconfinement phase transition. These results are obtained by carrying out analysis of generalized dimensions and Levy index involving relativistic charged particles produced on 14.5A GeV/c28 Si -nucleus collisions following Takagi's approach. The values of Levy index, μ, generalized fractal dimensions, Dq and degree of multifractality, βq, for different orders of moments are calculated in terms of Takagi moments for the experimental, FRITIOF, HIJING and random Monte Carlo (MC-RAND) generated events. The values of multifractal specific heats for all the above data sets are extracted using generalized dimensions, Dq. The analysis also shows small variations in the degree of multifractality for the experimental, FRITIOF and HIJING simulated events. However, the degree of multifractality is quite larger for the random Monte Carlo 28 Si -nucleus generated events at 14.5A GeV/c. Furthermore, the analyses of multifractal specific heat and Levy index in terms of Takagi moments support the presence of multifractality and occurrence of deconfinement phase transition in the experimental and simulated data sets, but for the uncorrelated Monte Carlo simulated events, occurrence of nonthermal phase transition is revealed.

STRANGENESS PRODUCTION IN RELATIVISTIC NUCLEAR COLLISIONS

2007 ◽  
Vol 16 (07n08) ◽  
pp. 2085-2090
Author(s):  
LIANG LI
Keyword(s):  
Phase Transition ◽  
Phenomenological Model ◽  
Quark Matter ◽  
Strange Quark ◽  
Strangeness Production ◽  
Quark Pairs ◽  
Nuclear Collisions ◽  
Relativistic Nuclear Collisions

Quark matter produced in relativistic nuclear collisions is thermally equilibrated. A phenomenological model is used to calculate the yield of strange quark pairs at AGS, SPS and RHIC, which is comparable to the results from the experiments. In addition, analysis with this model indicates that there is a signal of phase transition where the cms energy is approximately 7.5 GeV.

scholarly journals Tachyons and Solitons in Spontaneous Symmetry Breaking in the Frame of Field Theory

Symmetry ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1358
Author(s):  
Yiannis Contoyiannis ◽  
Michael P. Hanias ◽  
Pericles Papadopoulos ◽  
Stavros G. Stavrinides ◽  
Myron Kampitakis ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Critical Point ◽  
Universality Class ◽  
Lattice Simulation ◽  
Ginzburg Landau ◽  
Spin Lattice ◽  
Nuclear Collisions ◽  
Ising Spin ◽  
Relativistic Nuclear Collisions

This paper presents our study of the presence of the unstable critical point in spontaneous symmetry breaking (SSB) in the framework of Ginzburg–Landau (G-L) free energy. Through a 3D Ising spin lattice simulation, we found a zone of hysteresis where the unstable critical point continued to exist, despite the system having entered the broken symmetry phase. Within the hysteresis zone, the presence of the kink–antikink SSB solitons expands and, therefore, these can be observed. In scalar field theories, such as Higgs fields, the mass of this soliton inside the hysteresis zone could behave as a tachyon mass, namely as an imaginary quantity. Due to the fact that groups Ζ(2) and SU(2) belong to the same universality class, one expects that, in future experiments of ultra-relativistic nuclear collisions, in addition to the expected bosons condensations, structures of tachyon fields could appear.

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