scholarly journals Cluster expansion model for QCD baryon number fluctuations: No phase transition at μB/T<π

2018 ◽  
Vol 97 (11) ◽  
Author(s):  
Volodymyr Vovchenko ◽  
Jan Steinheimer ◽  
Owe Philipsen ◽  
Horst Stoecker
Keyword(s):  
Phase Transition ◽  
Cluster Expansion ◽  
Baryon Number ◽  
Expansion Model

scholarly journals Quark Cluster Expansion Model for Interpreting Finite-T Lattice QCD Thermodynamics

Symmetry ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 514
Author(s):  
David Blaschke ◽  
Kirill A. Devyatyarov ◽  
Olaf Kaczmarek
Keyword(s):  
Lattice Qcd ◽  
Cluster Expansion ◽  
Quark Gluon Plasma ◽  
Degrees Of Freedom ◽  
Gluon Plasma ◽  
Polyakov Loop ◽  
Unified Approach ◽  
Narrow Temperature Interval ◽  
Levinson Theorem ◽  
Expansion Model

In this work, we present a unified approach to the thermodynamics of hadron–quark–gluon matter at finite temperatures on the basis of a quark cluster expansion in the form of a generalized Beth–Uhlenbeck approach with a generic ansatz for the hadronic phase shifts that fulfills the Levinson theorem. The change in the composition of the system from a hadron resonance gas to a quark–gluon plasma takes place in the narrow temperature interval of 150–190 MeV, where the Mott dissociation of hadrons is triggered by the dropping quark mass as a result of the restoration of chiral symmetry. The deconfinement of quark and gluon degrees of freedom is regulated by the Polyakov loop variable that signals the breaking of the Z(3) center symmetry of the color SU(3) group of QCD. We suggest a Polyakov-loop quark–gluon plasma model with O(αs) virial correction and solve the stationarity condition of the thermodynamic potential (gap equation) for the Polyakov loop. The resulting pressure is in excellent agreement with lattice QCD simulations up to high temperatures.

scholarly journals Lattice-based QCD equation of state at finite baryon density: Cluster Expansion Model

2019 ◽  
Vol 982 ◽  
pp. 859-862 ◽  
Author(s):  
V. Vovchenko ◽  
J. Steinheimer ◽  
O. Philipsen ◽  
A. Pásztor ◽  
Z. Fodor ◽  
...  
Keyword(s):  
Equation Of State ◽  
Cluster Expansion ◽  
Baryon Density ◽  
Expansion Model

scholarly journals Baryon Symmetric Big Bang Cosmology

1974 ◽  
Vol 63 ◽  
pp. 335-339
Author(s):  
R. Omnès ◽  
J. L. Puget
Keyword(s):  
Phase Transition ◽  
Thermal Radiation ◽  
Baryon Number ◽  
Big Bang ◽  
Intermediate Energy ◽  
Baryon Density ◽  
Photon Density ◽  
X Rays ◽  
Nuclear Forces ◽  
Two Phases

In a big bang cosmology in which the Universe is initially filled with thermal radiation at a very high temperature the number of nucleon-antinucleon pairs decreases exponentially with temperature when the latter falls below a value such that kT ~ 1 GeV. To explain the observed ratio η = N/Nph ~ 10-9 where N is the average baryon density and Nph the photon density, nucleons and antinucleons must have been separated in the thermal radiation at a temperature greater than 30 MeV. A mechanism has been suggested which would lead to a phase transition in thermal radiation for kT > 300 MeV resulting in two phases with opposite non zero baryon number. The interaction between nucleons and antinucleons at intermediate energy is repulsive according to the mesonic theory of nuclear forces. This can be checked experimentally by measuring with enough precision the energy of X-rays emitted by the protonium atom and this experiment is now under way at CERN. Different models have been made to investigate their consequences and in each case a phase transition has been found above a temperature of the order of 300 MeV (Omnes, 1972; Aldrovandi and Caser, 1973; Cisneros, 1973).

scholarly journals Upper limit on first-order electroweak phase transition strength

2021 ◽  
Vol 36 (05) ◽  
pp. 2150024
Author(s):  
Shehu AbdusSalam ◽  
Mohammad Javad Kazemi ◽  
Layla Kalhor
Keyword(s):  
Phase Transition ◽  
Particle Physics ◽  
Baryon Number ◽  
Transition Strength ◽  
Bubble Wall ◽  
Electroweak Phase Transition ◽  
First Order ◽  
First Order Phase Transition ◽  
The Standard Model ◽  
First Order Phase

For a cosmological first-order electroweak phase transition, requiring no sphaleron washout of baryon number violating processes leads to a lower bound on the strength of the transition. The velocity of the boundary between the phases, the so-called bubble wall, can become ultrarelativistic if the friction due to the plasma of particles is not sufficient to retard the wall’s acceleration. This bubble “runaway” should not occur if a successful baryon asymmetry generation due to the transition is required. Using Boedeker–Moore criterion for bubble wall runaway, within the context of an extension of the Standard Model of particle physics with a real gauge-single scalar field, we show that a nonrunaway transition requirement puts an upper bound on the strength of the first-order phase transition.

scholarly journals Fourier coefficients of the net baryon number density and their scaling properties near a phase transition

2019 ◽  
Vol 793 ◽  
pp. 19-25 ◽  
Author(s):  
Gábor András Almási ◽  
Bengt Friman ◽  
Kenji Morita ◽  
Krzysztof Redlich
Keyword(s):  
Phase Transition ◽  
Fourier Coefficients ◽  
Baryon Number ◽  
Number Density ◽  
Scaling Properties

ON THE CONFINED–DECONFINED PHASE TRANSITION IN NUCLEAR MATTER AND NEUTRON STARS

2010 ◽  
Vol 19 (08n10) ◽  
pp. 1563-1568 ◽  
Author(s):  
L. N. BURIGO ◽  
B. E. J. BODMANN ◽  
R. B. JACOBSEN ◽  
C. A. Z. VASCONCELLOS ◽  
F. FERNÁNDEZ
Keyword(s):  
Phase Transition ◽  
Neutron Stars ◽  
Baryon Number ◽  
Local Conservation ◽  
Independent Components ◽  
First Order ◽  
Mit Bag Model ◽  
Effective Theories ◽  
Quark Phase ◽  
Hadronic Model

In this work we focus our study on the transition from hadron to deconfined quark matter, and we shall assume that the phase transition is first-order with two independent components, which are related to the local conservation of baryon number and the global conservation of electric charge. Relativistic effective theories are employed to describe the hadron and quark phase. Two different hadronic models are adopted: an adjustable model and the well known Boguta–Bodmer model. Deconfined phase is described employing the MIT bag model. Previous studies showed that the choice of the hadronic model as well as its parameters (including nucleon effective mass and hyperonic coupling schemes) have influence on phase transition properties. Our aim is to analyze if such results on phase transition play an important role on the modeling of neutron stars. To carry out such analysis, the Tolman–Oppenheimer–Volkoff equations are employed to determine the maximum mass for each combination of hadronic model and parameters.

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