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Scalar field theory under Robin boundary conditions: two-point function and energy-momentum tensor 罗宾边界条件下的标量场理论:两点函数和能动张量
Pub Date : 2024-09-11 DOI: arxiv-2409.07060
David Dudal, Aaron Gobeyn, Bruno W. Mintz, Thomas Oosthuyse, Sebbe Stouten
We reconsider four-dimensional scalar field theory in presence of Robinboundary conditions on two parallel plates. These boundary conditions aredirectly imposed in the path integral definition of the theory via auxiliaryfields living on the plates. We discuss how this leads to boundary correctionsto the standard energy momentum tensor operator. Via a dimensional reduction toan effective three-dimensional boundary theory, we compute the Casimir energyin terms of the plate separation and the two Robin parameters, as well as thescalar field propagator in the presence of the plates. Coincidentally, theboundary contribution vanishes in the expectation value for the vacuum energy,thereby giving results in full accordance with other energy expressions in theliterature for the same setup. We also discuss for which values of the Robinparameters this energy is real-valued.
我们重新考虑了在两个平行板上存在罗宾边界条件的四维标量场理论。这些边界条件通过生活在板上的辅助场直接强加在理论的路径积分定义中。我们将讨论这如何导致对标准能量动量张量算子的边界修正。通过对有效三维边界理论的维度还原,我们计算了板块分离和两个罗宾参数的卡西米尔能,以及板块存在时的标量场传播者。巧合的是,边界贡献在真空能的期望值中消失了,因此得出的结果与文献中针对相同设置的其他能量表达式完全一致。我们还讨论了这种能量在哪些罗宾参数值下是实值。
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引用次数: 0
Poincare Invariance in Discrete Gravity 离散引力中的庞加莱不变性
Pub Date : 2024-09-11 DOI: arxiv-2409.07536
Ali H. Chamseddine, Mariam Khaldieh
A formulation of discrete gravity was recently proposed based on defining alattice and a shift operator connecting the cells. Spinors on such a space willhave rotational SO(d) invariance which is taken as the fundamental symmetry.Inspired by lattice QCD, discrete analogues of curvature and torsion weredefined that go smoothly to the corresponding tensors in the continuous limit.In this paper, we show that the absence of diffeomorphism invariance could bereplaced by requiring translational invariance in the tangent space byenlarging the tangent space from SO(d) to the inhomogeneous Lorentz groupISO(d) to include translations. We obtain the ISO(d) symmetry by taking insteadthe Lie group SO(d + 1) and to perform on it Inonu-Wigner contraction. We showthat, just as for continuous spaces, the zero torsion constraint converts thetranslational parameter to a diffeomorphism parameter, thus explaining theeffectiveness of this formulation.
最近,有人提出了一种离散引力公式,它基于定义晶格和连接晶格的移位算子。受格子 QCD 的启发,我们定义了曲率和扭转的离散类似物,它们在连续极限中与相应的张量平滑地对应。在本文中,我们证明了通过将切线空间从 SO(d) 扩大到不均匀洛伦兹群 ISO(d)以包括平移,可以通过要求切线空间的平移不变性来替代衍射不变性的缺失。我们通过取代列群 SO(d+1)并对其进行伊诺努-维格纳收缩来获得 ISO(d) 对称性。我们证明,与连续空间一样,零扭转约束将平移参数转换为衍射参数,从而解释了这种表述的有效性。
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引用次数: 0
Unmixing sub-leading Regge trajectories of $mathcal{N} = 4$ Super-Yang-Mills 解除 $mathcal{N} = 4$ 超级杨-米尔斯的次引导雷格轨迹
Pub Date : 2024-09-11 DOI: arxiv-2409.07529
Julius Julius, Nika Sergeevna Sokolova
We study the conformal field theory data (CFT-data) of planar 4D $mathcal{N}= 4$ Super-Yang-Mills theory in the strong 't Hooft coupling limit. This regimeexplores the physics of massive short strings in the flat-space limit of thedual AdS. We focus on the CFT-data of the massive short strings exchanged inthe operator product expansion (OPE) of the four-point function dual to theVirasoro-Shapiro amplitude. This CFT-data arranges itself into Reggetrajectories in the flat-space limit. Using inputs from recent advances in thecomputation of the AdS Virasoro-Shapiro amplitude, integrability, and astipulation based on analyticity of the CFT-data in spin, we are able to fixall the CFT-data on the four unique sub-leading Regge trajectories, at leadingnon-trivial order, as a function of the string-mass level. One of ourpredictions is that one of the four unique sub-leading Regge trajectoriesdecouples from the OPE in the flat-space limit. This hints at an emergentselection rule in the flat-space limit, similar to our previous results inarXiv:2310.06041. Our procedure should be applicable in a variety of similarsetups like for the AdS Veneziano amplitude or in ABJM.
我们研究强't Hooft耦合极限下平面4D $mathcal{N}= 4$ 超级杨-米尔斯理论的共形场论数据(CFT-数据)。这个体系探索了双 AdS 平空间极限下的大质量短弦物理。我们重点研究了与维拉索罗-沙皮罗振幅对偶的四点函数的算子乘积展开(OPE)中交换的大质量短弦的 CFT 数据。这种 CFT 数据在平空间极限中排列成雷格轨迹。利用 AdS 维拉索罗-夏皮罗振幅计算的最新进展、可积分性,以及基于自旋 CFT 数据解析性的分析,我们能够将所有 CFT 数据固定在四条独特的亚领导雷格轨迹上,作为弦质量水平的函数,达到领导非难阶。我们的预测之一是,在平空间极限中,四条独特的亚领导雷格轨迹中的一条会与 OPE 解耦。这暗示了平空间极限中的新兴选择规则,类似于我们之前在arXiv:2310.06041中的结果。我们的程序应该适用于各种类似的设置,如 AdS Veneziano 振幅或 ABJM。
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引用次数: 0
Ellipsoidal Universe and Cosmic Shear 椭圆宇宙和宇宙剪切力
Pub Date : 2024-09-11 DOI: arxiv-2409.07509
Luigi Tedesco
We consider a Bianchi I geometry of the Universe. We obtain a cosmic shearexpression related with the eccentricity of the Universe. In particular westudy the connection among cosmic shear, eccentricity and CMB. The equation areself-contained with only two parameters.
我们考虑宇宙的比安奇 I 几何结构。我们得到了与宇宙偏心率相关的宇宙剪切力表达式。我们特别研究了宇宙剪切力、偏心率和 CMB 之间的联系。方程自含两个参数。
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引用次数: 0
The effect of resummation on retarded Green's function and greybody factor in $AdS$ black holes 重和对 $AdS$ 黑洞中迟滞格林函数和灰体因子的影响
Pub Date : 2024-09-11 DOI: arxiv-2409.07370
Julián Barragán Amado, Shankhadeep Chakrabortty, Arpit Maurya
We investigate the retarded Green's function and the greybody factor inasymptotically AdS black holes. Using the connection coefficients of the Heunequation, expressed in terms of the Nekrasov-Shatashvili (NS) free energy of an$SU(2)$ supersymmetric gauge theory with four fundamental hypermultiplets, wederive asymptotic expansions for both the retarded Green's function and thegreybody factor in the small horizon limit. Furthermore, we compute thecorrections to these asymptotic expansions resulting from the resummationprocedure of the instanton part of the NS function.
我们研究了渐近 AdS 黑洞中的迟滞格林函数和灰体因子。我们使用 Heunequation 的连接系数(以具有四个基本超多重子的$SU(2)$超对称规理论的 Nekrasov-Shatashvili(NS)自由能表示),对小视界极限中的迟滞格林函数和灰体因子进行了渐近展开。此外,我们还计算了NS函数瞬子部分的求和过程对这些渐近展开的修正。
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引用次数: 0
Flat space gravity at finite cutoff 有限截止时的平面空间引力
Pub Date : 2024-09-11 DOI: arxiv-2409.07643
Batoul Banihashemi, Edgar Shaghoulian, Sanjit Shashi
We study the thermodynamics of Einstein gravity with vanishing cosmologicalconstant subjected to conformal boundary conditions. Our focus is on comparingthe series of subextensive terms to predictions from thermal effective fieldtheory, with which we find agreement for the boundary theory on a spatialsphere, hyperbolic space, and flat space. We calculate the leading Wilsoncoefficients and observe that the first subextensive correction to the freeenergy is negative. This violates a conjectured bound on this coefficient inquantum field theory, which we interpret as a signal that gravity does notfully decouple in the putative boundary dual.
我们研究了共形边界条件下宇宙常数消失的爱因斯坦引力的热力学。我们的重点是将一系列亚广延项与热有效场理论的预测进行比较,我们发现空间球、双曲空间和平面空间的边界理论与热有效场理论的预测一致。我们计算了前导威尔逊系数,并观察到自由能的第一个次广义修正为负值。这违反了量子场论中对这一系数的猜想约束,我们将其解释为引力在推定边界对偶中没有完全解耦的信号。
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引用次数: 0
From Feynman integrals to quantum algorithms: the Loop-Tree Duality connection 从费曼积分到量子算法:环树对偶关系
Pub Date : 2024-09-11 DOI: arxiv-2409.07252
German Sborlini
In the context of high-energy particle physics, a reliable theory-experimentconfrontation requires precise theoretical predictions. This translates intoaccessing higher-perturbative orders, and when we pursue this objective, weinevitably face the presence of complicated multi-loop Feynman integrals. Thereare serious bottlenecks to compute them with classical tools: the time toexplore novel technologies has arrived. In this work, we study theimplementation of quantum algorithms to optimize the integrands of scatteringamplitudes. Our approach relies on the manifestly causal Loop-Tree Duality(LTD), which re-casts the loop integrand into phase-space integrals and avoidsspurious non-physical singularities. Then, we codify this information in such away that a quantum computer can understand the problem, and build Hamiltonianswhose ground state are directly related to the causal representation. Promisingresults for generic families of multi-loop topologies are presented.
在高能粒子物理学中,可靠的理论-实验对抗需要精确的理论预测。这就意味着要获得更高的微扰阶数,而当我们追求这一目标时,不可避免地要面对复杂的多环费曼积分。用经典工具计算这些积分存在严重瓶颈:探索新技术的时候到了。在这项工作中,我们研究了优化散射振幅积分的量子算法的实现。我们的方法依赖于明显的因果环树对偶性(LTD),它将环路积分重铸成相空间积分,避免了虚假的非物理奇点。然后,我们对这些信息进行编码,使量子计算机能够理解问题,并建立起基态与因果表征直接相关的哈密顿。本文介绍了针对一般多环拓扑族的有希望的结果。
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引用次数: 0
Thermodynamic Extremality in Power-law AdS Black Holes A Universal Perspective 幂律 AdS 黑洞中的热力学极端性 一个普遍的视角
Pub Date : 2024-09-11 DOI: arxiv-2409.07079
Ankit Anand
This study investigates the universal relation between Goon and Penco (GP)proposed within the frameworks of Power-Maxwell, Power-Yang-Mills, andMaxwell-Power-Yang-Mills black holes. We begin by analyzing these black holes'thermodynamics and then calculating the perturbed metric and thermodynamicquantities by perturbing the action. Our objective is to examine theconsistency of the GP relation across various power-law terms in the fieldequations, aiming to gain deeper insights into the nature of these black holes.The GP connection remains robust across different power spacetimes, indicatingthat this relation is a universal feature of black holes.
本研究探讨了在鲍尔-麦克斯韦(Power-Maxwell)、鲍尔-杨-米尔斯(Power-Yang-Mills)和麦克斯韦-鲍尔-杨-米尔斯(Maxwell-Power-Yang-Mills)黑洞框架内提出的古恩与彭科(GP)之间的普遍关系。我们首先分析这些黑洞的热力学,然后通过扰动作用计算扰动度量和热力学量。我们的目标是检验场方程中各种幂律项的GP关系的一致性,旨在更深入地了解这些黑洞的本质。
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引用次数: 0
Spin of Primordial Black Holes from Broad Power Spectrum: Radiation Dominated Universe 从宽功率谱看原始黑洞的自旋:辐射主导的宇宙
Pub Date : 2024-09-10 DOI: arxiv-2409.06494
Indra Kumar Banerjee, Tomohiro Harada
We perform a study to obtain the initial spin or the nondimensional Kerrparameter $a_{*}$ of primordial black holes (PBHs) created during the radiationdominated phase of the universe from not only nearly monochromatic but alsobroad curvature power spectra. Motivated by inflation and first-order phasetransitions, we consider a power law shape for the curvature perturbation.Although we can naturally neglect the contribution from the length scalessmaller than the scale of interest, that from the larger scales may potentiallybe significant for a broad power spectrum, for which the spin is sensitive tothe width of the power spectrum. So, we introduce a width parameter $r_{k}$,the ratio of the largest scale to the length of interest. We find that the rootmean square of $a_{*}$ is largest for PBHs created from locally nearly scaleinvariant curvature power spectra with $r_{k} sim 3.5$. The upper limit is$sim 1times 10^{-4}$ for $M=10^{17}-10^{23}$ g, $sim 1.7times 10^{-4}$ for $M=1-100 M_{odot}$ and $sim 2.5times 10^{-3}$even for an incredibly large mass of $M=10^{50}$ g.
我们进行了一项研究,不仅从近乎单色的曲率功率谱,而且还从宽广的曲率功率谱中获得了宇宙辐射主导阶段产生的原始黑洞(PBHs)的初始自旋或二维克尔参数$a_{*}$。虽然我们可以很自然地忽略小于感兴趣尺度的长度尺度的贡献,但对于宽功率谱来说,大尺度的贡献可能会很重要,因为自旋对功率谱的宽度很敏感。因此,我们引入了一个宽度参数 $r_{k}$,即最大尺度与相关长度的比值。我们发现,对于由局部近乎尺度不变的曲率功率谱产生的 PBHs 而言,$a_{*}$ 的均方根最大,其值为 $r_{k} $。sim 3.5$。当质量为$M=10^{17}-10^{23}$ g时,其上限为$1times 10^{-4}$;当质量为$M=1-100 M_{odot}$时,其上限为$1.7times 10^{-4}$;当质量为$M=10^{50}$ g时,其上限为$2.5times 10^{-3}$。
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引用次数: 0
The chiral torsional anomaly and the Nieh-Yan invariant with and without boundaries 有边界和无边界的手性扭转反常和聂扬不变量
Pub Date : 2024-09-10 DOI: arxiv-2409.06766
Johanna Erdmenger, Ioannis Matthaiakakis, René Meyer, Dmitri Vassilevich
There exists a long-standing debate regarding the torsion contribution to the4d chiral anomaly of a Dirac fermion. Central to this debate is the Nieh-Yananomaly, which has been considered ill-defined and a regularization artifact.Using a heat-kernel approach, we examine the relationship between the Diracoperator index, the Nieh-Yan invariant and the torsional anomaly. We show theNieh-Yan invariant vanishes on spacetimes without boundaries, if the Diracindex is well-defined. In the known examples of non-vanishing Nieh--Yaninvariant on manifolds without boundaries, the heat kernel expansion breaksdown, making the index ill-defined. Finally, for finite boundaries we identifyseveral finite bulk and boundary anomaly terms, alongside bulk and boundaryNieh-Yan terms. We construct explicit counterterms that cancel the Nieh-Yanterms and argue that the boundary terms give rise to a torsional anomalous Halleffect. Our results emphasize the importance of renormalization conditions, asthese can affect both the thermal and non-thermal Nieh-Yan anomalycoefficients. In addition, we demonstrate that anomalous torsional transportmay arise even without relying on the Nieh-Yan invariant.
关于狄拉克费米子 4d 手性反常的扭转贡献,存在着长期的争论。利用热核方法,我们研究了狄拉克算子指数、聂-杨不变式和扭转反常之间的关系。我们证明,如果狄拉克指数定义良好,聂-扬不变式在无边界的空间上会消失。在已知的无边界流形上聂-杨不变式不消失的例子中,热核展开破裂,使得指数定义不清。最后,对于有限边界,我们确定了几种有限体和边界异常项,以及体和边界聂-杨项。我们构建了明确的反项来抵消聂-扬项,并认为边界项产生了扭转反常哈勒效应。我们的结果强调了重正化条件的重要性,因为这些条件会影响热和非热聂赫燕反常系数。此外,我们还证明,即使不依赖聂扬不变量,也可能出现反常扭转输运。
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引用次数: 0
期刊
arXiv - PHYS - High Energy Physics - Theory
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