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In the standard model of particle physics, the strong force is characterized by the theory of quantum chromodynamics (QCD). It is commonly understood from QCD properties that hadrons, at sufficiently high temperatures or densities, melt…

Nuclear Theory · Physics 2023-11-23 Gao-Chan Yong

The cosmological evolution can be described in terms of directly measurable cosmological scalar parameters (deceleration $q$, jerk $j$, snap $s$, etc...) constructed out of high order derivatives of the scale factor. Their behavior at the…

High Energy Physics - Phenomenology · Physics 2018-07-18 P. Castorina , D. Lanteri , S. Mancani

We study the dynamics of first-order phase transition in the early Universe when it was $10-50 \mu s$ old with quarks and gluons condensing into hadrons. We look at how the Universe evolved through the phase transition in small as well as…

High Energy Physics - Phenomenology · Physics 2009-10-31 Deepak Chandra , Ashok Goyal

Particle and photon production is analyzed in the presence of transverse flow using two approximations to describe the properties of the hadronic medium, one containing only $\pi, \rho, \omega$, and $\eta$ mesons (simplified equation of…

Nuclear Theory · Physics 2008-11-26 J. Cleymans , K. Redlich , D. Srivastava

Using the grand canonical ensemble formulation of a multi-particle statistical system, the thermodynamical description of the dual QCD has been presented in terms of the bag model of hadrons and analyzed for the quark-gluon plasma phase of…

High Energy Physics - Phenomenology · Physics 2015-05-19 H. C. Chandola , Garima Punetha , H. Dehnen

Hagedorn states (HS) are a tool to model the hadronization process which occurs in the phase transition phase between the quark gluon plasma (QGP) and the hadron resonance gas (HRG). Their abundance is believed to appear near the Hagedorn…

High Energy Physics - Phenomenology · Physics 2015-06-22 M. Beitel , K. Gallmeister , C. Greiner

Pre-existing density of states for a Quark-Gluon Phase, based on Thomas-Fermi and Bethe mode, is expanded by incorporation of new variables. Results from recent study indicate that perturbations in the form of a finite non-zero chemical…

High Energy Physics - Phenomenology · Physics 2024-06-21 Agam K. Jha , Aviral Srivastava

In the context of the Hagedorn temperature half-centenary I describe our understanding of the hot phases of hadronic matter both below and above the Hagedorn temperature. The first part of the review addresses many frequently posed…

Nuclear Theory · Physics 2015-09-21 Johann Rafelski

We analyze the equation of state of 2+1 flavor lattice QCD at zero baryon density by constructing the simple quark-hadron hybrid model that has both quark and hadron components simultaneously. We calculate hadron and quark contribution…

High Energy Physics - Phenomenology · Physics 2016-08-03 Akihisa Miyahara , Yuhei Torigoe , Hiroaki Kouno , Masanobu Yahiro

A method is developed to consistently satisfy the Gibbs equilibrium conditions between the quark-gluon and hadronic phase, although each phase has been formulated in separate grand canonical partition functions containing three quark…

High Energy Physics - Phenomenology · Physics 2009-11-11 A. S. Kapoyannis

A qualitative analysis of the chiral phase transition in QCD with two massless quarks and non--zero baryon density is performed. It is assumed that at zero baryonic density, \rho=0, the temperature phase transition is of the second order.…

High Energy Physics - Phenomenology · Physics 2009-11-10 M. N. Chernodub , B. L. Ioffe

We study the quark hadron phase transition in the framework of massive gravity. We show that the modification of the FRW cosmological equations leads to the quark hadron phase transition in the early massive Universe. Using numerical…

General Relativity and Quantum Cosmology · Physics 2016-09-01 K. Atazadeh

In the early Universe, strongly interacting matter was a quark-gluon plasma. Both lattice computations and heavy ion collision experiments however tell us that, in the absence of chemical potentials, no plasma survives at $T <\sim 150$ MeV.…

Cosmology and Nongalactic Astrophysics · Physics 2016-12-19 Silvio A. Bonometto , Roberto Mainini

Nuclear matter at finite temperature and barion density exhibits several phase transitions that could happen at the early stages of the Universe evolution and could be realized in heavy-ion or hadron-hadron collisions. Microscopic…

High Energy Physics - Phenomenology · Physics 2015-02-26 V. I. Yukalov , E. P. Yukalova

Based on the assumptions of the standard model of cosmology, a phase transition associated with chiral symmetry breaking after the electroweak transition has occurred at approximately $10\mu$ seconds after the Big Bang to convert a plasma…

General Relativity and Quantum Cosmology · Physics 2015-06-19 F. Kheyri , M. Khodadi , H. R. Sepangi

The effect of subcritical hadron bubbles on a first-order quark-hadron phase transition is studied. These subcritical hadron bubbles are created due to thermal fluctuations, and can introduce a finite amount of phase mixing (quark phase…

High Energy Physics - Phenomenology · Physics 2008-11-26 P. Shukla , A. K. Mohanty , S. K. Gupta , Marcelo Gleiser

A qualitative analysis of the chiral phase transition in QCD with two massless quarks and non-zero baryon density is performed. It is assumed that at zero baryonic density, $\rho=0$, the temperature phase transition is of the second order…

High Energy Physics - Phenomenology · Physics 2007-05-23 B. L. Ioffe

We study the nucleation of a quark gluon plasma (QGP) phase in a hadron gas at low temperatures and high baryon densities. This kind of process will presumably happen very often in nuclear collisions at FAIR and NICA. When the appropriate…

High Energy Physics - Phenomenology · Physics 2016-05-18 D. A. Fogaça , S. M. Sanches , R. Fariello , F. S. Navarra

A qualitative analysis of the chiral phase transition in QCD at non--zero baryon density is performed. It is assumed that at zero baryonic density, $\rho=0$, the temperature phase transition is of the second order and quark condesate $\eta=…

High Energy Physics - Phenomenology · Physics 2007-05-23 B. L. Ioffe

Based on the assumption that the QCD phase diagram gives a realistic picture of hadronic and quark matter under different regimes, it is possible to claim that a quark core may be present inside compact objects commonly named hybrid neutron…

Nuclear Theory · Physics 2022-09-28 M. R. Pelicer , D. P. Menezes