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Interpretation of Dark Matter and quark-gluon Plasma: The Generation of the Periodic Table Elements and Its Phase Diagram: A Novel Millennium Power Plant

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Natural Science 2015年第9期7卷 438-458页

作者： Murad Al Shibli Autonomous Systems Engineering Technology Department Head Senior Faculty Abu Dhabi Polytechnic Institute of Applied Technology Abu Dhabi UAE

This paper presents a novel physical interpretation of the state of matter of the quark-gluon as the most fundamental building blocks in nature. Such a model is derived based on the assumption that dark matter and dark energy behave as a perfect ideal fluid at extremely high temperature. By the virtue of Boltzmann constant of the ideal gas law and NASA’s Cosmic Microwave Background Explorer (CMB) which estimate that the space has an average temperature close to 2.7251 Kelvin, then the equivalent mass-energy of the fundamental particle of the dark matter/dark energy is determined. Moreover, assuming a uniform space dark energy/dark matter density, then the critical temperature at which the dark matter has a unity entity per volume is identified as 64 × 1012 K. The calculated critical temperature of the quark-gluon plasma is found to be proportional to the temperature generated by colliding heavy ions at the Relativistic Heavy Ion Collider (RHIC) and European Organization for Nuclear Research (CERN). Moreover, the individual critical temperatures of the quark-gluon plasma matter at which the elements of the Periodic Table are generated are explicitly determined. The generation temperature trend of the elements of the Periodic Table groups and Periods is then demonstrated. Accordingly, the phase diagram of the quark-gluon state matter is proposed. Finally, a new model of quark-gluon power generation plant is proposed and aims to serve humanity with new energy sources in the new millennium.

关键词： Dark Matter Dark Energy quark-gluon Plasma Equation of State Periodic Table Standard Model

Dilepton Emission at Temperature Dependent Baryonic quark-gluon Plasma

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Journal of Modern Physics 2013年第5期4卷 582-586页

作者： Shougaijam S. Singh Yogesh Kumar Department of Physics and Astrophysics University of Delhi Delhi India

Dilepton emission is calculated from quark-gluon plasma (QGP) with the consideration of temperature dependent chemical potential (TDCP). The model is considered to be quasi-model and hence take the dynamical quark mass as a finite value dependence on temperature. The temperature in quark mass enhances in the growth of dilepton emission rates. The emission rate of dilepton spectrum is shown in the intermediate mass region (IMR) of 1.0 - 4.0 GeV and its rate is observed to be a strong increasing function of the temperature dependent chemical potential for quark and anti-quark annihilation.

关键词： Dilepton quark-gluon Plasma

Photon Emission from quark gluon Plasma at RHIC and LHC

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Journal of Modern Physics 2014年第8期5卷 686-692页

作者： Poonam Jain Yogesh Kumar Department of Physics Sri Aurobindo College University of Delhi New Delhi India

We work on photon production through annihilation and Compton, and annihilation with scattering (AWS) processes through a quark-gluon plasma (QGP) in high energy nuclear collision incorporating the parametrization factors in strong coupling value and thermal dependent quark mass obtained through a coupling value. We find that photon yield increases with the increasing of the temperature and dominated by early times. We also compare the influence of coupling value on the spectrum of thermal photons. The production rate of photons is observed in the range of low and intermediate transverse momentum. The results are compared with other work.

关键词： Direct Photon quark-gluon Plasma

quark jet versus gluon jet: fully-connected neural networks with high-level features

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Science China(Physics,Mechanics & Astronomy) 2019年第9期62卷 49-59页

作者： Hui Luo Ming-Xing Luo Kai Wang Tao Xu GuoHuai Zhu Graduate School of China Academy of Engineering Physics Beijing 100193China Zhejiang Institute of Modem Physics and Department of Physics Zhejiang UniversityHangzhou 310027China Institut fiir Theoretische Physik Universitat Hamburg Luruper Chaussee 149Hamburg D- 22761Germany

Jet identification is one of the fields in high energy physics that machine learning has begun to make an impact. More often than not, convolutional neural networks are used to classify jet images with the benefit that essentially no physics input is *** by a recent work by Datta and Larkoski, we study the classification of quark/gluon-initiated jets based on fully-connected neural networks(FNNs), where expert-designed physical variables are taken as input. FNNs are applied in two ways: trained separately on various narrow jet transverse momentum pTJbins;trained on a wide region of pTJ∈[200, 1000] GeV. We find their performances are almost the same. The performance is better when the pTJis larger. Jet discrimination with FNN is studied on both particle and detector level data. The results based on particle level data are comparable with those from deep convolutional neural networks, while the significance improvement characteristic(SIC) from detector level data would at most decrease by 15%.We also test the performance of FNNs with the full set or subsets of jet observables as input features. The FNN with one subset consisting of fourteen observables shows nearly no degradation of performance. This indicates that these fourteen expert-designed observables could have captured the most necessary information for separating quark and gluon jets.

关键词： standard model simulation quark-gluon jets machine learning

Screening and damping effects on the thermodynamic potential in QGP

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Science China(Physics,Mechanics & Astronomy) 2003年第1期46卷 8-16页

作者： WANG Xin(王欣) LI Jiarong(李家荣) Department of Physics Shanghai Jiaotong University Shanghai 200030 China Institute of Particle Physics Huazhong Normal University Wuhan 430079 China Institute of Particle Physics Huazhong Normal University Wuhan 430079 China

By using the spectral functions of gluons, which contain Debye screening and soft damping effects,the effective two-loop thermodynamic potential in quark-gluon plasma was evaluated via real-time temperatureQCD. The result that depends on screening and damping of gluons as physical parameters is obtained. It canbe seen that our analytical result and the recent lattice results are in agreement for T〉～2Tc.

关键词： quark-gluon plasma, thermal field theory.

Chiral criticality and glue dynamics

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Chinese Physics C 2019年第7期43卷 31-36页

作者： Wei-Jie Fu School of Physics Dalian University of Technology

The chiral order-parameter σ field and its higher-order cumulants of fluctuations are calculated within the functional renormalization group approach by adopting the local potential approximation in this study. The influence of glue dynamics on fluctuations of the σ field is investigated, and we find that they are weakly affected. This is in sharp contrast to the baryon number fluctuations, which are sensitive to the glue dynamics and involve information on the color confinement. The implications of our calculated results are discussed from the viewpoint of the theoretical and experimental efforts in the search for the QCD critical end point.

关键词： chiral symmetries renormalization group methods quark-gluon plasma color confinement

Global constraints from RHIC and LHC on transport properties of QCD fluids in CUJET/CIBJET framework

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Chinese Physics C 2019年第4期43卷 69-88页

作者： Shuzhe Shi Jinfeng Liao Miklos Gyulassy Physics Department and Center for Exploration of Energy and Matter Indiana University Nuclear Science Division Lawrence Berkeley National Laboratory Pupin Lab MS-5202 Department of Physics Columbia University Institute of Particle Physics and Key Laboratory of quark &Lepton Physics (MOE) Central China Normal University

We report results of a comprehensive global х~2 analysis of nuclear collision data from RHIC(0.2 ATeV),LHC1(2.76 ATeV), and recent LHC2(5.02 ATeV) energies using the updated CUJET framework. The framework consistently combines viscous hydrodynamic fields predicted by VISHNU2+1(validated with soft p_T﹤2 GeV bulk observables) and the DGLV theory of jet elastic and inelastic energy loss generalized to QGP fluids with an sQGMP color structure, including effective semi-QGP color electric quark and gluon as well as emergent color magnetic monopole degrees of freedom constrained by lattice QCD data. We vary the two control parameters of the model(the maximum value of the running QCD coupling, c, and the ratio cm of color magnetic to electric screening scales) and calculate the global х~2(α_c,c_m) compared with available jet fragment observables( R_(AA),v_2). A global х~2 minimum is found with α_c≈0.9±0.1 and c_m≈0.25±0.03. Using CIBJET, the event-by-event(ebe) generalization of the CUJET framework, we show that ebe fluctuations in the initial conditions do not significantly alter our conclusions(except for v_3). An important theoretical advantage of the CUJET and CIBJET frameworks is not only its global х~2 consistency with jet fragment observables at RHIC and LHC and with non-perturbative lattice QCD data, but also its internal consistency of the constrained jet transport coefficient, ■(E,T)/T^3, with the near-perfect fluid viscosity to entropy ratio(η/s～T^3/■～0.1-0.2) property of QCD fluids near Tc needed to account for the low p_T﹤2 GeV flow observables. Predictions for future tests at LHC with 5.44 ATeV Xe + Xe and 5.02 ATeV Pb + Pb are also presented.

关键词： jet quenching quark-gluon plasma relativistic heavy-ion collisions heavy flavor physics

Classical model for diffusion and thermalization of heavy quarks in a hot medium: memory and out-of-equilibrium effects

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Chinese Physics C 2019年第9期43卷 90-100页

作者： Marco Ruggieri Marco Frasca Santosh Kumar Das School of Nuclear Science and Technology Lanzhou University222 South Tianshui RoadLanzhou 730000China Via Erasmo Gattamelata Rome 00176Italy School of Physical Science Indian Institute of Technology GoaPonda-403401GoaIndia

We consider a simple model for the diffusion of heavy quarks in a hot bath,modeling the latter by an ensemble of oscillators distributed according to either a thermal distribution or to an out-of-equilibrium distribution with a saturation *** this model it is easy to introduce memory effects by changing the distribution of oscillators:we model them by introducing a Gaussian distribution,dN/dω,which can be deformed continuously from aδ?function,giving a Markov dissipation,to a broad kernel with *** the equation of motion of the heavy quark in the bath,we remark how dissipation comes out naturally as an effect of the back-reaction of the oscillators on the ***,the exact solution of this equation allows to define the thermalization time as the time necessary to remove any memory of the initial *** find that the broadening of the dissipative kernel,while keeping the coupling fixed,lowers the thermalization *** also derive the fluctuation-dissipation theorem for the bath,and use it to estimate the kinematic regime in which momentum diffusion of the heavy quark dominates over *** find that diffusion is more important as long as K0/E is small,where K0 and E denote the initial energy of the heavy quark and the average energy of the bath,respectively.

关键词： relativistic heavy ion collisions heavy quarks Brownian motion memory effect quark-gluon plasma

quark Transport Properties in the Region of Coexistence of Both Hadronic and QGP Phases

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Communications in Theoretical Physics 2001年第7期36卷 47-52页

作者： CHEN Xiang-Jun LI Hong WANG Gang ZHANG Wei-Ning HUO Lei Department of Physics Harbin Institute of Technology Harbin 150001 China Department of Physics Harbin Institute of Technology Harbin 150001 China Department of Physics Harbin Institute of Technology Harbin 150001 China Department of Physics Harbin Institute of Technology Harbin 150001 China Department of Physics Harbin Institute of Technology Harbin 150001 China

The physical picture of coexistence of both hadronic and QGP phases is given by Friedberg and T.D. Lee's nontopology soliton model. The transport properties of quark in color space and spin space in a system of two-ph... 详细信息

关键词： hadron, quark-gluon plasma, soliton, transport property