检索结果-南通市图书馆

Properties of quark matter in a new quasiparticle model with QCD running coupling

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2016年第6期59卷 49-57页

作者： Zhen Yan Lu guang xiong peng Jian Feng Xu Shi peng Zhang School of Physical Sciences University of Chinese Academy of Sciences Theoretical Physics Center for Science Facilities Institute of High Energy Physics

The running of the QCD coupling in the effective mass causes thermodynamic inconsistency problem in the conventional quasiparticle model. We provide a novel treatment which removes the inconsistency by an effective bag constant. The chemical potential dependence of the renormalization subtraction point is constrained by the Cauchy condition in the chemical potential space. The stability and microscopic properties of strange quark matter are then studied within the completely self-consistent quasiparticle model, and the obtained equation of state of quark matter is applied to the investigation of strange stars. It is found that our improved model can describe well compact stars with mass about two times the solar mass, which indicates that such massive compact stars could be strange stars.

关键词： quark matter quasiparticle model thermodynamic inconsistency

Strange star candidates revised within a quark model with chiral mass scaling

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2011年第4期11卷 482-490页

作者： Ang Li guang-xiong peng Ju-Fu Lu Department of Physics and Institute of Theoretical Physics and Astrophysics Xiamen University Xiamen 361005 China Department of Physics Graduate University Chinese Academy of Sciences Beijing 100049 China

We calculate the properties of static strange stars using a quark model with chiral mass scaling. The results are characterized by a large maximum mass （-1.6 M⊙） and radius （-10km）. Together with a broad collection of modern neutron star models, we discuss some recent astrophysical observational data that could shed new light on the possible presence of strange quark matter in compact stars. We conclude that none of the present astrophysical observations can prove or confute the existence of strange stars.

关键词： dense matter -- elementary particles -- equation of state -- stars: inte-riors

Effects of non-Newtonian gravity on the properties of strange stars

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2017年第2期17卷 1-6页

作者： Zhen-Yan Lu guang-xiong peng Kai Zhou School of Physical Sciences University of Chinese Academy of Sciences Theoretical Physics Center for Science Facilities Institute of High Energy Physics Synergetic Innovation Center for Quantum Effects and Application Hunan Normal University

The properties of strange star matter are studied in the equivparticle model with inclusion of non-Newtonian gravity. It is found that the inclusion of non-Newtonian gravity makes the equation of state stiffer if Witten＇s conjecture is true. Correspondingly, the maximum mass of strange stars becomes as large as two times the solar mass, and the maximum radius also becomes bigger. The coupling to boson mass ratio has been constrained within the stability range of strange quark matter.

关键词： quark matter -- non-Newtonian gravity -- equation of state -- strange stars

Magnetized strange quark matter in the equivparticle model with both confinement and perturbative interactions

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2016年第4期27卷 158-166页

作者： Cheng peng guang-xiong peng Cheng-Jun Xia Jian-Feng Xu Shi-peng Zhang School of Physics University of Chinese Academy of Sciences Theoretical Physics Center for Science Facilities Institute of High Energy Physics Synergetic Innovation Center for Quantum Effects and Application Hunan Normal University Key Laboratory of Frontiers in Theoretical Physics Institute of Theoretical Physics

We investigated the properties of strange quark matter in an external strong magnetic field with both confinement and leading-order perturbative interactions considered. It was found that the leading-order perturbative interaction can stiffen the equation of state of magnetized quark matter, while the magnetic field lowers the minimum energy per baryon. By solving the Tolman–Oppenheimer–Volkoff equations, we obtain the internal structure of strange stars. The maximum mass of strange stars can be as large as 2 times the solar mass.

关键词：奇异夸克物质微扰磁化 e模型状态方程能量最小奥本海默内部结构

Quark mass scaling and properties of light-quark matter

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2016年第6期27卷 43-48页

作者： Zhen-Yan Lu guang-xiong peng Shi-peng Zhang Marco Ruggieri Vincenzo Greco School of Physical Sciences University of Chinese Academyof SciencesBeijing 100049China Theoretical Physics Center for Science Facilities Institute of High Energy PhysicsBeijing 100049China Synergefic Innovation Center for Quantum Effects and Application Hunan Normal UniversityChangsha 410081China Department of Physics and Astronomy University of CataniaVia S.Sofia 6495125 CataniaItaly Laboratori Nazionali del Sud INFN-LNSVia S.Sofia 6295123 CataniaItaly

We study the properties of two-flavor quark matter in the equivparticle model.A new quark mass scaling at finite temperature is proposed and applied to the thermodynamics of two-flavor quark *** is found that the perturbative interaction has strong effect on quark matter properties at finite temperature and high *** pressure at the minimum free energy per baryon is exactly *** increasing temperature,the energy per baryon increases,while the free energy per baryon decreases.

关键词：物质性质夸克质量轻夸克标度最小自由能有限温度夸克物质相互作用

From strangelets to strange stars:a unified description

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2016年第2期61卷 172-177页

作者： Cheng-Jun Xia guang-xiong peng En-guang Zhao Shan-Gui Zhou State Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences Theoretical Physics Center for Science Facilities Institute of High Energy Physics Synergetic Innovation Center for Quantum Effects and Application Hunan Normal University Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator

The conventionally separated treatments for strangelets and strange stars are now unified with a more comprehensive theoretical description for objects ranging from strangelets to strange stars. After constraining the model parameter according to the Witten–Bodmer hypothesis and observational mass–radius probability distribution of pulsars, we investigate the properties of this kind of objects. It is found that the energy per baryon decreases monotonically with increasing baryon number and reaches its minimum at the maximum baryon number, corresponding to the most massive strange star. Due to the quark depletion,an electric potential well is formed on the surface of the quarkpart. For a rotational bare strange star, a magnetic field with the typical strength in pulsars is generated.

关键词： Strangelets Strange stars Strangequark matter Unified description Witten-Bodmerhypothesis

Symmetry energy of strange quark matter and tidal deformability of strange quark stars

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2022年第11期33卷 89-100页

作者： Jian-Feng Xu Cheng-Jun Xia Zhen-Yan Lu guang-xiong peng Ya-peng Zhao College of Information Engineering Suqian UniversitySuqian 223800China School of Physics and Electrical Engineering AnYang Normal UniversityAnyang 455000China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials School of Physics and ElectronicsHunan University of Science and TechnologyXiangtan 411201China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Institute of High-Energy Physics Chinese Academy of SciencesBeijing 100049China School of Mathematics and Physics Henan Urban Construction UniversityPingdingshan 467036China

Research performed during the past decade revealed an important role of symmetry energy in the equation of state(EOS)of strange quark matter(SQM).By introducing an isospin-dependent term into the quark mass scaling,the SQM stability window in the equivparticle model was *** results show that a sufficiently strong isospin dependence C_(I)can significantly widen the SQM region of absolute stability,yielding results that simultaneously satisfy the constraints of the astrophysical observations of PSR J1614-2230 with 1.928±0.017 Mand tidal deformability 70≤Λ_(1:4)≤580 measured in the event *** increasing C_(I),the difference between the u,d,and s quark fractions for the SQM inβ-equilibrium becomes inconspicuous for C>0,leading to small isospin asymmetryδ,and further resulting in similar EOS and structures of strange quark stars(SQSs).Moreover,unlike the behavior of the maximum mass of ud QSs,which varies with C_(I)depending on the sign of the parameter C,the maximum mass of the SQSs decreases monotonously with increasing CI.

关键词： Symmetry energy Strange quark matter Strange stars Tidal deformability

Gravitational wave echoes from strange quark stars in the equation of state with density-dependent quark masses

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2023年第11期34卷 112-119页

作者： Jian‑Feng Xu Lei Cui Zhen‑Yan Lu Cheng‑Jun Xia guang‑xiong peng School of arts and sciences Suqian UniversitySuqian 223800China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials School of Physics and ElectronicsHunan University of Science and TechnologyXiangtan 411201China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

According to the recent studies,the gravitational wave(GW)echoes are expected to be generated by quark stars composed of ultrastiff quark *** ultrastiff equations of state(EOS)for quark matter were usually obtained either by a simple bag model with artificially assigned sound velocity or by employing interacting strange quark matter(SQM)depicted by simple reparameterization and *** this study,we investigate GW echoes with EOSs for SQM in the framework of the equivparticle model with density-dependent quark masses and pairing *** conclude that strange quark stars(SQSs)can be sufficiently compact to possess a photon sphere capable of generating GW echoes with frequencies in the range of approximately 20 ***,SQSs cannot account for the observed 72 Hz signal in GW170817 ***,we determined that quark-pairing effects play a crucial role in enabling SQSs to satisfy the necessary conditions for producing these types of echoes.

关键词： Strange quark star Gravitational wave echoes Color-flavour-locked phase Strange quark matter

Strange quark matter and proto-strange stars in a baryon density-dependent quark mass model

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2022年第5期46卷 171-179页

作者： Huai-Min Chen Cheng-Jun Xia guang-xiong peng School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China Theoretical Physics Center for Science Facilities Institute of High Energy PhysicsBeijing 100049China Synergetic Innovation Center for Quantum Effects and Application Hunan Normal UniversityChangsha 410081China

The properties of strange quark matter and the structures of(proto-)strange stars are studied within the framework of a baryon density-dependent quark mass model,where a novel quark mass scaling and self-consistent thermodynamic treatment are *** results indicate that the perturbative interaction has a significant impact on the properties of strange quark *** is determined that the energy per baryon increases with temperature,while the free energy decreases and eventually becomes *** fixed temperatures,the pressure at the minimum free energy per baryon is zero,suggesting that the thermodynamic self-consistency is ***,the sound velocity v in quark matter approaches the extreme relativistic limit(c/√3)as the density *** increasing the strengths of the confinement parameter D and perturbation parameter C,the tendency for v to approach the extreme relativistic limit at high density is slightly ***(proto-)strange stars,the novel quark mass scaling can accommodate massive proto-strange stars with their maximum mass surpassing twice the solar mass by considering the isentropic stages along the star evolution line,where the entropy per baryon of the star matter is set to be 0.5 and 1 with the lepton fraction Y_(l)=0.4.

关键词： strange quark matter temperature thermodynamic