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quintessence Field as a Perfect Cosmic Fluid of Constant Pressure

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Communications in Theoretical Physics 2015年第3期63卷 391-400页

作者：刘文中欧阳君杨焕雄 Interdisciplinary Center for Theoretical Study University of Science and Technology of China

We study the cosmology of a quintessence scalar held which is equivalent to a non-barotropic perfect fluid of constant *** coincidence problem is alleviated by such a quintessence equation-of-state that interpolates between plateau of zero at large redshifts and plateau of minus one as the redshift approaches to *** quintessence Geld is neither a unified dark matter nor a mixture of cosmological constant and cold dark matter,relying on the facts that the quintessence density contrasts of sub-horizon modes would undergo a period of late-time dechne and the squared sound speeds of quintessence perturbations do not *** a role does the quintessence play is dynamic dark energy,its clustering could remarkably reduce the growth rate of the density perturbations of non-relativistic matters.

关键词： dark energy quintessence

quintessence Reconstruction of Interacting HDE in a Non-Flat Universe

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Communications in Theoretical Physics 2014年第6期61卷 773-780页

作者： A.Sheykhi H.Alavirad A.Bagheri E.Ebrahimi Physics Department and Biruni Observatory College of Sciences Shiraz University Research Institute for Astronomy and Astrophysics of Maragha (RIAAM) Institute for Theoretical Physics Karlsruhe Institute of Technology Department of Physics Shahid Bahonar University

In this paper we consider quintessence reconstruction of interacting holographic dark energy in a non-fiat background. As system＇s IR cutoff we choose the radius of the event horizon measured on the sphere of the horizon, defined as L = at（t）. To this end we construct a quintessence model by a real, single scalar field. Evolution of the potential, V（φ）, as well as the dynamics of the scalar field, φ, is obtained according to the respective holographic dark energy. The reconstructed potentials show a cosmological constant behavior for the present time. We constrain the model parameters in a fiat universe by using the observational data, and applying the Monte Carlo Markov chain simulation. We obtain the best fit values of the holographic dark energy model and the interacting parameters as c=1.0576-0.6632-0.6632^＋0.3010＋0.3052 and ζ =0.2433-0.2251-.2251^＋0.6373＋0.6373 , respectively. From the data fitting results we also find that the model can cross the phantom line in the present universe where the best fit value of the dark energy equation of state is WD=-1.2429.

关键词： quintessence holographic dark energy data fitting

Some characteristics of three exact solutions of Einstein equations minimally coupled to a quintessence field

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Chinese Physics B 2009年第8期18卷 3115-3121页

作者：周晓华 Department of Mathematics and Physics Fourth Military Medical University

We show some characteristics of three exact solutions to Einstein＇s gravity equation minimally coupled to a quintessence field. Besides eternal inflation, several other interesting inflationary processes, such as tra... 详细信息

关键词： inflation quintessence solution singularity

Uplifting of AdS type to quintessence-like potential induced by frozen large-scale Lorentz violation

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Chinese Physics C 2020年第8期44卷 180-192页

作者： Hanyu Zhai Jiayin Shen Xun Xue Department of Physics East China Normal UniversityShanghai 200241China Center for Theoretical Physics Xinjiang UniversityUrumqi 830046China

The quintessence-like potential of vacuum energy can meet the requirements from both quantum gravity and the accelerating expansion of the *** anti-de Sitter(AdS)vacuum in string theory must be lifted to the meta-stable dS vacuum with a positive vacuum energy density to explain the accelerating expansion of the *** on possible large-scale Lorentz violation,we define an effective cosmological constant that depends not only on the bare cosmological constant but also on the Lorentz violation *** find that the evolution of the effective cosmological constant exhibits the behavior of the quintessence potential when the bare cosmological constant originates from the string landscape,in contrast to the existence of a local minimum during evolution when the bare cosmological constant is supplied by the *** critical value of the bare cosmological constant is approximately zero for the behavior *** frozen large-scale Lorentz violation can uplift the AdS vacua to an effective quintessence-like one in this sense.

关键词： Lorentz violation dark energy inflation quintessence landscape

Cosmological evolution of quintessence with a sign-changing interaction in dark sector

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Science China(Physics,Mechanics & Astronomy) 2014年第9期57卷 1805-1808页

作者： ZHANG Ming SUN ChengYi YANG ZhanYing YUE RuiHong Department of Physics Northwest University Institute of Modern Physics Northwest University Faculty of Science Ningbo University

Dark energy and dark matter are only indirectly measured though their gravitational *** is possibie that there is some direct,non-gravitational interaction between DE and DM,which can be used to solve(or,at least alleviate)several important theoretical *** the present work,by analysing the cosmological dynamical system with a dark-sector interaction which changes its sign during the cosmological evolution,we find a scaling attractor to help to alleviate the cosmic-coincidence *** result shows that this interaction can bring new features to the cosmology.

关键词： cosmological evolution scaling attractor dark sector quintessence

Shadows of magnetically charged rotating black holes surrounded by quintessence

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Chinese Physics C 2022年第6期46卷 246-256页

作者： Chengxiang Sun Yunqi Liu Wei-Liang Qian Ruihong Yue Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China Escola de Engenharia de Lorena Universidade de Sao Paulo12602-810LorenaSPBrazil School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China Faculdade de Engenharia de Guaratingueta Universidade Estadual Paulista12516-410GuaratingueiaSPBrazil

In this work,we study the optical properties of a class of magnetically charged rotating black hole *** black holes in question are assumed to be immersed in the quintessence field,and subsequently,the resulting black hole shadows are expected to be modified by the presence of dark *** investigate the photon region and the black hole shadow,especially their dependence on the relevant physical conditions,such as the quintessence state parameter,angular momentum,and magnetic charge *** photon regions depend sensitively on the horizon structure and possess intricate ***,from the viewpoint of a static observer,we explore a few observables,especially those associated with the distortion of the observed black hole shadows.

关键词： black hole shadow quintessence magnetically charged rotating black hole

Hawking-Page phase transitions of charged AdS black holes surrounded by quintessence

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Chinese Physics C 2021年第1期45卷 355-365页

作者： Da-Wei Yan Ze-Rong Huang Nan Li Department of Physics College of SciencesNortheastern UniversityShenyang 110819China Department of Material Physics School of Material Sciences and EngineeringNortheastern UniversityShenyang 110819China

Hawking-Page phase transitions between the thermal anti-de Sitter vacuum and charged black holes surrounded by quintessence are studied in the extended phase *** quintessence field,with the state parameter-1 详细信息

关键词： Hawking-Page phase transition quintessence extended phase space

Holographic p-Wave Superconductors in quintessence AdS Black Hole Spacetime

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Communications in Theoretical Physics 2013年第10期60卷 471-478页

作者：陈松柏潘启沅 Institute of Physics and Department of Physics Hunan Normal University Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education Hunan Normal University

We construct a holographic p-wave superconductor model in the background of quintessence AdS black hole with an SU（2） Yang-Mills gauge field and then probe the effects of quintessence on the holographic p-wave superconduc- tor. We investigate the relation between the critical temperature and the state parameter of quintessence, and present the numerical results for electric conductivity. It is shown that the condensation of the vector field becomes harder as the absolute value of the state parameter increases. Unlike the scalar condensate in the s-wave model, the condensation of the vector field in p-wave model can occur in the total value range of the state parameter wq of quintessence. These results could help us know more about holographic superconductor and dark energy.

关键词： holographic superconductors quintessence AdS/CFT correspondence

Anisotropic stellar structures in the f(T)theory of gravity with quintessence via embedding approach

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Chinese Physics C 2021年第4期45卷 426-439页

作者： Allah Ditta Mushtaq Ahmad Ibrar Hussain G.Mustafa Department of Mathematics COMSATS University IslamabadLabore CampusPakistan National University of Computer and Emerging Sciences Chiniot-Faisalabad CampusPakistan School of Electrical Engineering and Computer Science National University of Sciences and TechnologyH-12IslanpabadPakistan Department of Mathematics Shanghai UniversityShanghai 200444China

This work suggests a new model for anisotropic compact stars with quintessence in f(T)gravity by us-ing the off-diagonal tetrad and the power-law as f(T)=βT^(n),where T is the scalar torsion andβand n are real *** acquired field equations incorporating the anisotropic matter source along with the quintessence field,in f(T)gravity,are investigated by making use of the specific character of the scalar torsion T for the observed stars PSRJ1614-2230,***-3,EXO1785-248,and *** is suggested that all the stellar struc-tures under examination are advantageously independent of any central singularity and are *** graphical analysis shows that various physical features which are crucially important for the emergence of the stellar structures are conferred.

关键词： quintessence power-law model f(T)gravity anisotropic compact stars