scholarly journals Passage of heavy quarks through the fluctuating hot QCD medium

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
Mohammad Yousuf Jamal ◽  
Bedangadas Mohanty
Keyword(s):  
Chemical Potential ◽  
Equations Of State ◽  
Collision Frequency ◽  
Heavy Quarks ◽  
Baryon Density ◽  
Momentum Dependence ◽  
Theory Approach ◽  
Gain Energy ◽  
Field Fluctuations ◽  
Experimental Facilities

AbstractThe change in the energy of the moving heavy (charm and bottom) quarks due to field fluctuations present in the hot QCD medium has been studied. A finite quark chemical potential has been considered while modeling the hot QCD medium counting the fact that the upcoming experimental facilities such as Facility for Anti-proton and Ion Research (FAIR) and Nuclotron-based Ion Collider fAcility (NICA) are expected to operate at finite baryon density and moderate temperature. The effective kinetic theory approach has been adopted where the collisions have been incorporated using the well-defined collisional kernel, known as Bhatnagar–Gross–Krook (BGK). To incorporate the non-ideal equations of state (EoSs) effects/medium interaction effects, an extended effective fugacity model has been adopted. The momentum dependence of the energy change due to fluctuation for the charm and bottom quark has been investigated at different values of collision frequency and chemical potential. The results are exciting as the heavy quarks are found to gain energy due to fluctuations while moving through the produced medium at finite chemical potential and collision frequency.

scholarly journals Locating the critical end point using the linear sigma model coupled to quarks.

2018 ◽  
Vol 172 ◽  
pp. 02003
Author(s):  
Alejandro Ayala ◽  
J. A. Flores ◽  
L. A. Hernández ◽  
S. Hernández-Ortiz
Keyword(s):  
Sigma Model ◽  
Chemical Potential ◽  
Potential Temperature ◽  
Mean Field ◽  
Field Approximation ◽  
Baryon Density ◽  
Linear Sigma Model ◽  
Mean Field Approximation ◽  
End Point ◽  
The Mean

We use the linear sigma model coupled to quarks to compute the effective potential beyond the mean field approximation, including the contribution of the ring diagrams at finite temperature and baryon density. We determine the model couplings and use them to study the phase diagram in the baryon chemical potential-temperature plane and to locate the Critical End Point.

scholarly journals Spectrum of QCD at Finite Isospin Density

2018 ◽  
Vol 175 ◽  
pp. 07042 ◽  
Author(s):  
Philipp Scior ◽  
Lorenz von Smekal ◽  
Dominik Smith
Keyword(s):  
Phase Diagram ◽  
Low Temperature ◽  
Temperature Region ◽  
Chemical Potential ◽  
Phase Diagram Of Qcd ◽  
Baryon Density ◽  
Polyakov Loop ◽  
High Chemical ◽  
Pion Condensation

We study the phase diagram of QCD at finite isospin density using two flavors of staggered quarks. We investigate the low temperature region of the phase diagram where we find a pion condensation phase at high chemical potential. We started a basic analysis of the spectrum at finite isospin density. In particular, we measured pion, rho and nucleon masses inside and outside of the pion condensation phase. In agreement with previous studies in two-color QCD at finite baryon density we find that the Polyakov loop does not depend on the density in the staggered formulation.

scholarly journals Lattice QCD-based equations of state at vanishing net-baryon density

2014 ◽  
Vol 929 ◽  
pp. 157-168 ◽  
Author(s):  
M. Bluhm ◽  
P. Alba ◽  
W. Alberico ◽  
A. Beraudo ◽  
C. Ratti
Keyword(s):  
Lattice Qcd ◽  
Equations Of State ◽  
Baryon Density

Topological phase transition in effective model of QCD with chiral nonrestoration

2015 ◽  
Vol 24 (03) ◽  
pp. 1550021
Author(s):  
Tran Huu Phat ◽  
Nguyen Tuan Anh ◽  
Phung Thi Thu Ha
Keyword(s):  
Phase Transition ◽  
Liquid State ◽  
Chemical Potential ◽  
Equations Of State ◽  
Effective Model ◽  
Topological Phase ◽  
Baryon Chemical Potential ◽  
Fermi Sphere ◽  
Topological Phase Transition ◽  
First Order Transition

The topological phase transition is studied systematically within an effective model of Quantum Chromodynamics (QCD) where the chiral symmetry, broken at zero temperature, is not restored at high temperature and/or baryon chemical potential. It is found that during phase transition the system undergoes a first-order transition from the nonFermi liquid state to the Fermi liquid state which is protected by topology of the Fermi sphere. The phase diagram of the transition in the plane of temperature and baryon chemical potential is established. The critical behaviors of various equations of state are determined.

scholarly journals Thermal properties of hot and dense matter: Influence of rapid rotation on protoneutron stars, hot neutron stars, and neutron star merger remnants

2021 ◽  
Vol 252 ◽  
pp. 05004
Author(s):  
Polychronis Koliogiannis ◽  
Charalampos Moustakidis
Keyword(s):  
Neutron Star ◽  
Equation Of State ◽  
Neutron Stars ◽  
Nuclear Matter ◽  
Equations Of State ◽  
Interaction Model ◽  
Dense Matter ◽  
Baryon Density ◽  
Dense Nuclear Matter ◽  
Protoneutron Stars

The knowledge of the equation of state is a key ingredient for many dynamical phenomena that depend sensitively on the hot and dense nuclear matter, such as the formation of protoneutron stars and hot neutron stars. In order to accurately describe them, we construct equations of state at FInite temperature and entropy per baryon for matter with varying proton fractions. This procedure is based on the momentum dependent interaction model and state-of-the-art microscopic data. In addition, we investigate the role of thermal and rotation effects on microscopic and macroscopic properties of neutron stars, including the mass and radius, the frequency, the Kerr parameter, the central baryon density, etc. The latter is also connected to the hot and rapidly rotating remnant after neutron star merger. The interplay between these quantities and data from late observations of neutron stars, both isolated and in matter of merging, could provide useful insight and robust constraints on the equation of state of nuclear matter.

scholarly journals Two Novel Approaches to the Hadron-Quark Mixed Phase in Compact Stars

Universe ◽  
2018 ◽  
Vol 4 (9) ◽  
pp. 94 ◽  
Author(s):  
Vahagn Abgaryan ◽  
David Alvarez-Castillo ◽  
Alexander Ayriyan ◽  
David Blaschke ◽  
Hovik Grigorian
Keyword(s):  
Quark Matter ◽  
Chemical Potential ◽  
Equations Of State ◽  
Polynomial Interpolation ◽  
Compact Star ◽  
Compact Stars ◽  
Weight Functions ◽  
Geometrical Structures ◽  
First Order ◽  
Maxwell Construction

First-order phase transitions, such as the liquid-gas transition, proceed via formation of structures, such as bubbles and droplets. In strongly interacting compact star matter, at the crust-core transition but also the hadron-quark transition in the core, these structures form different shapes dubbed “pasta phases”. We describe two methods to obtain one-parameter families of hybrid equations of state (EoS) substituting the Maxwell construction that mimic the thermodynamic behaviour of pasta phase in between a low-density hadron and a high-density quark matter phase without explicitly computing geometrical structures. Both methods reproduce the Maxwell construction as a limiting case. The first method replaces the behaviour of pressure against chemical potential in a finite region around the critical pressure of the Maxwell construction by a polynomial interpolation. The second method uses extrapolations of the hadronic and quark matter EoS beyond the Maxwell point to define a mixing of both with weight functions bounded by finite limits around the Maxwell point. We apply both methods to the case of a hybrid EoS with a strong first order transition that entails the formation of a third family of compact stars and the corresponding mass twin phenomenon. For both models, we investigate the robustness of this phenomenon against variation of the single parameter: the pressure increment at the critical chemical potential that quantifies the deviation from the Maxwell construction. We also show sets of results for compact star observables other than mass and radius, namely the moment of inertia and the baryon mass.

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