An Introduction to AdS/CFT Correspondence for Phenomenologists

We give a brief introduction to the AdS/CFT correspondence and its application to QCD physics,especiallyits application in the study of quark-gluon-plasma (QGP)formed in the relativistic heavy ion collision (RHIC).Thisreview is based on the talks given in several schools and programs for the phenomenologists working on nuclear physicsand particle physics.

How to Explicitly Calculate Feynman and Wheeler Propagators in the ADS/CFT Correspondence

We discuss, giving all necessary details, the boundary-bulk propagators. We do it for a scalar field, with and without mass, for both the Feynman and the Wheeler cases. Contrary to standard procedure, we do not need here to appeal to any unfounded conjecture (as done by other authors). Emphasize that we do not try to modify standard ADS/CFT procedures, but use them to evaluate the corresponding Feynman and Wheeler propagators. Our present calculations are original in the sense of being the first ones undertaken explicitly using distributions theory (DT). They are carried out in two instances: 1) when the boundary is a Euclidean space and 2) when it is of Minkowskian nature. In this last case we compute also three propagators: Feynman’s, Anti-Feynman’s, and Wheeler’s (half advanced plus half retarded). For an operator corresponding to a scalar field we explicitly obtain, for the first time ever, the two points’ correlations functions in the three instances above mentioned. To repeat, it is not our intention here to improve on ADS/CFT theory but only to employ it for evaluating the corresponding Wheeler’s propagators.

Hua operator on vector bundle: Application to AdS/CFT correspondence of Dirac fields

Hua's theory of harmonic functions on classical domains is generalized to the theory on holomorphic vector bundles over classical domains and further on vector bundles over the real classical domains and quaternion classical domains. In case of the simplest quaternion classical domain there is a relation between Hua operator and Dirac operator,by which an AdS/CFT correspondence of Dirac fields is established.

Surface growth approach for bulk reconstruction in the AdS/BCFT correspondence

In this study,we extend the surface growth approach for bulk reconstruction into the Ad S spacetime with a boundary in the Ad S/BCFT correspondence.We show that the geometry in the entanglement wedge with a boundary can be constructed from the direct growth of bulk extremal surfaces layer by layer.Furthermore,we observe that the surface growth configuration in BCFT can be connected with the defect multi scale entanglement renormalization ansatz(MERA)tensor network.Additionally,we investigate the entanglement of purification within the surface growth process,which not only reveals more refined structure of entanglement entropy in the entanglement wedge but also suggests a selection rule for surface growth in the bulk reconstruction.

Moduli Space of IIB Superstring and SUYM in AdS5 × S^5

这篇论文由二部分组成。部分地Ⅰ，我们以嵌入 inAdS_5 的 chiral 在 AdS_5 x S~5 上解释 IIB 超弦的 moduli 空间的隐藏的对称，它结果是 CP~3 保角的仿射的 Toda 模型。我们考察怎么在在仿射的代数学的顶点操作符处理转变和循环参数μ的值的 Riemann-Hilbert 明确的表达的杆的位置μ决定 soliton 解决方案的 moduli 空格，它描述 Green-Schwarz 超弦的 moduli 空格。我们也显示出怎么，并且 soliton 绳怎么与扭曲和扭合器的膨胀旋转系数μ对应于 Robinson 一致这 affineSU (4 ) 对称 affinizes 在扭合器空间的保角的对称。Inpart Ⅱ，由扩大调味品在 AdS_5 的 IIB 绳的对称的行动， x S~5 到 D_3 brane，我们发现 Higgs Yang 工厂地包括的一个计量 WZW 行动向轴的方向的 2-cocycle 异例。进 ambitwistor 的左和正确α - 飞机胶水的左、正确的扭合器结构。Nahm 方程的 Thesymmetry 组集中地被递一个仿射的组，因此，我们解释为什么光谱曲线被仿射的 Toda 给。

A Solution to the Cosmological Constant Problem Using the Holographic Principle (A Brief Note)

This paper integrates a quantum conception of the Planck epoch early universe with FSC model formulae and the holographic principle, to offer a reasonable explanation and solution of the cosmological constant problem. Such a solution does not appear to be achievable in cosmological models which do not integrate black hole formulae with quantum formulae such as the Stephan-Boltzmann law. As demonstrated herein, assuming a constant value of Lambda over the great span of cosmic time appears to have been a mistake. It appears that Einstein’s assumption of a constant, in terms of vacuum energy density, was not only a mistake for a statically-balanced universe, but also a mistake for a dynamically-expanding universe.

Comparing AdS/CFT dipole model to HERA F_2 data

We apply an AdS/CFT-inspired color-dipole model which contains only three free parameters to describe the HERA data for the inclusive structure function F 2 at small Bjorken-x and virtuality.We found that the saturation scale in our AdS/CFT-based parameterization varies in the range of 1 ÷ 3 GeV becoming independent of energy/Bjorken-x at very small x.This leads to the prediction of x-independence of the structure functions at very small x.With the fitted parameters in our model,the predictions for F 2,longitudinal structure function,charm structure function and total photo-production cross-sections in the kinematic regions of future experiments can be given.

量子纠缠与时空结构

众所周知,自然界中存在着四种基本相互作用,分别为强相互作用、弱相互作用、电磁相互作用与引力相互作用。然而,前三者可以在量子力学的框架下自洽,只有特殊的引力相互作用尚未与其他相互作用统一。因此,追求引力的量子化是现代物理学最迫切和首要的目标。物理学家们发现,可以利用量子场论的方法来研究引力理论。在这过程中,我们发现量子纠缠、几何以及时空定域性之间的关系,这似乎暗示了通往量子引力的研究方向。通过量子纠缠,我们希望进一步探索量子引力领域,为引力的量子化找到一个突破口,从而发现时空的本质。文章简要回顾量子纠缠熵的历史发展,并讨论纠缠熵与几何之间的关系。

高等教育增值评价的现实挑战与因应策略

增值评价作为深化新时代高等教育评价改革的一个重要方向,既受到经济社会发展需求和国家教育政策调整的外部推动,同时也是高等教育评价改革发展的内在必然要求。开展高等教育增值评价是适应日渐多元的高等教育生态的迫切需要,是改进和发展教育评价科学的迫切需要,也是实现国家高等教育战略目标的迫切需要。目前,我国高等教育增值评价面临着系统性基础理论欠缺、理想数据较难获得、计算方法和模型难达共识、与大学文化存在较多抵触等障碍,需要进一步深耕高等教育增值评价理论、重视评价数据库建设、改进评价方法和技术、开展大量实证检验、坚守评价基本原则。

五维Gauss-Bonnet纯时空下全息纠缠熵解析约束方程

引力/规范场论对偶作为研究黑洞以及量子引力性质的一种有力工具,其各种修正模式也得到越来越多的研究.Gauss-Bonnet修正描述了量子或者弦效应对时空本身的高阶曲率修正,对理解量子引力具有重要作用.由于其度规的复杂性,研究Gauss-Bonnet时空与规范场论对偶时,一般采用数值计算的方法得到全息纠缠熵的一些性质,利用反德西特时空/共形场论(AdS/CFT)对偶理论推导了五维Gauss-Bonnet纯时空下全息纠缠熵所对应的极值面应该满足的解析约束方程,为更进一步推导Gauss-Bonnet黑洞时空下全息纠缠熵的解析演化提供了新的基础.

Static Dielectric Function and Interaction Potential in Strong Coupling with AdS/CFT

In this paper, we study the static dielectric function and interaction potential in strong coupling limit with AdS/CFT correspondence. The dielectric function is depressed compared with that in weak coupling. The interaction potential then presents a weaker screening characteristics in strong coupling, which indicates a smaller Debye mass compared with weak coupling.

Charm structure functions and gluon shadowing effects with the AdS/CFT model

By means of the UGD function extracted from an AdS/CFT inspired saturation model, the charm and bottom structure functions are studied in fixed-order perturbation theory. It is shown that the theoretical results are in good agreement with the recent HERA data. Then, this UGD function is also used to investigate net-kaon rapidity distribution in Au＋Au collisions at RHIC energies and the theoretical results fit well to the BRAHMS data. In the end of this paper, we give the predicted results for nuclear charm structure function at very small x where the popular shadowing parameterizations are invalid.

乌梅丸治疗溃疡性结肠炎方证相应的实验研究

目的:研究中医经典名方乌梅丸及加味方治疗UC在抗炎药效机理方面的中医方证相应依据。方法:建立大鼠UC两种类型模型,用研究方干预,取结肠病变组织,用ELISA法测定与抗炎药效密切相关因子IL-6、IL-10、TNFα和PGE2及用Westen Bloting法测定ICAM-1表达程度。结果:大鼠化学性刺激模型中乌梅丸、乌梅丸加味、芍药汤均影响相关因子(P<0.01,P<0.05),具有一定的抗炎药效,但各复方间差异不显著;而在大鼠免疫化学性复合模型中乌梅丸及加味方均明显影响和调节不同因子,其强度有显著性差异(P<0.01,P<0.05),同时ICAM-1表达程度也有差异。结论:乌梅丸及加味方和芍药汤在抗炎药效及机理方面存在一定程度的中医方证相应关系。

Holographic Schwinger effect in a soft wall AdS/QCD model

We perform a potential analysis for the holographic Schwinger effect in a deformed AdS5 model with conformal invariance broken by a background dilaton.We evaluated the static potential by analyzing the classical action of a string attached to a rectangular Wilson loop on a probe D3 brane located at an intermediate position in the bulk AdS space.We observed that the inclusion of the chemical potential tends to enhance the production rate,which is opposite to the effect of the confining scale.In addition,we calculated the critical electric field based on the Dirac-Born-Infeld(DBI)action.

欧盟及成员国应对烟草品牌延伸广告的立法概况及其启示

烟草品牌延伸广告是烟草商规避已有法律禁止性规定,间接为烟草产品做广告的一种手段。在我国已批准世界卫生组织《控制烟草框架公约》的背景下,借鉴欧盟及主要成员国禁止烟草品牌延伸广告的相关立法,以完善我国现有法律法规。

Lifshitz引力中的全息p波超导体

在探子极限下,通过数值方法研究了Lifshitz参数z对超导体相变的影响。具体来说,把带质量的麦克斯韦复矢量场耦合到4维Lifshitz黑洞中构造了p波超导体。发现时空各向异性程度的增加抑制导体/超导体相变和电导率。在临界温度附近,系统经历二阶相变,与平均场论结果一致。在一定程度上,此复矢量场模型是SU(2)Yang-Mills模型带一般质量的推广。

掺杂全息费米系统

构建了包括两个规范场和一个中性标量场的两流体模型.数值得到渐近标量毛AdS黑膜解.模型导入了两个可调节的化学势,从而导入了可控的掺杂参数.研究了特定参数下全息费米系统的性质.研究表明随着赝标量汤川秀树耦合增大,能隙打开,标志着系统衍生出绝缘相.固定赝标量汤川秀树耦合,随着掺杂参数的增大,能隙打开的临界值减少,能隙的形成更容易.并给出了相应的温度-掺杂相图.最后,根据模型参数,将模型分类.

一类新的Stückelberg全息超导模型

本文研究了含Stückelberg机理的黑洞全息超导模型.通过选取标量场新的高阶修正形式,建立了新的Stückelberg黑洞全息超导模型.通过研究模型参数对标量场凝聚的影响,发现了当模型参数大于临界值时,高阶修正可以引起一阶相变.同时本文还考查了反作用对临界值的影响.

高校校园公益广告的发展前景研究

伴随着公益广告的逐步发展,校园公益广告也被更多的人所关注。本文对校园公益广告进行了简要阐述,详细分析了校园公益广告在我国高校的发展现状,指出限制校园公益广告发展的因素,并就此提出对于提高校园公益广告的发展前景的相关建议。

带有高阶修正的全息p波超导体相变

在探子极限下,通过数值方法研究了高阶修正对超导体相变的影响。具体来说,把带质量的麦克斯韦复矢量场和Weyl张量平方修正项耦合到4维AdS黑洞中构造了带有高阶修正的p波超导体模型。结果表明在比较宽的高阶参数范围内仍然可以得到比较合理的超导凝聚行为。在最低朗道能级,磁场可以诱导超导相变,且高阶修正抑制相变。然而,在激发态能级,磁场破坏超导相变,且高阶修正促进相变。