Nonlocal scalar field in an external potential: WKB approximation

非局域引力黑洞的准正规模式

Quasinormal modes of nonlocal gravity black holes

在修订的Deser-Woodard非局域引力中，研究静态球对称黑洞的标量、电磁与轴引力准正规模式，采用WKB加Padé逼近计算频率，并与Schwarzschild结果比较，发现基本模式相对偏差可达约12%，并讨论未来引力波探测约束。

宇宙守护者

Cosmological Daemon

经典版本的大爆炸宇宙学宇宙模型在时间的开始包含一个奇点，因此场方程中的时间变量应该超过半条线。讨论了具有无穷多个导数的非局部弦场论方程，指出了整条实直线上的非局部算子与半条实直线上的非局部算子的一个重要区别。我们使用的热方程方法，并表明，在半行除了通常的初始数据的一个新的任意函数（外部源）发生，我们称之为守护函数。守护函数控制着宇宙的演化，类似于热力学中的麦克斯韦恶魔。宇宙和多元宇宙是与守护进程环境交互的开放系统。在最简单的情况下，非定域标量场简化为通常的与外部源耦合的定域标量场，这在暴胀的随机方法中讨论过。守护进程源代码可以帮助获得具有小标量场的混沌膨胀场景。

Transmutation of nonlocal scale in infinite derivative field theories

In this paper we will show an ultraviolet -infrared connection for ghost-free infinite derivative field theories where the Lagrangians are made up of exponentials of entire functions. In particular, for $N$-point amplitudes a new scale emerges in the infrared from the ultraviolet, i.e. $M_{\rm eff}\sim M_s/N^α,$ where $M_s$ is the fundamental scale beyond the Standard Model, and $α>0$ depends on the specific choice of an entire function and on whether we consider zero or nonzero external momenta. We will illustrate this by first considering a scalar toy model with a cubic interaction, and subs…

非平凡拓扑空间中量子场论的非定域性、自伴性和θ真空

Nonlocality, Self-Adjointness and Theta-Vacuum in Quantum Field Theory in Spaces with Nontrivial Topology

我们考虑了量子场论中Aharonov-Bohm效应的一个类似物：在磁涡旋的背景下，即使在不考虑非零外场强度的空间区域的情况下，费米真空也能达到非平凡的量子数.确定了真空量子数对涡旋通量的依赖关系和排斥区边界条件的选择。

On the photon-pseudoscalar particle mixing in media and external fields

In this work, I study the mixing of photons with pseudoscalar particles and vice-versa in the presence of an external magnetic field and a pseudoscalar field. I solve exactly for the first time in the literature the equations of motion of the electromagnetic field coupled with a pseudoscalar field in the presence of a constant magnetic field with arbitrary direction with respect to the direction of propagation of the fields in vacuum. In addition, I also solve exactly the equations of motion in a magnetized plasma/gas for perpendicular propagation with respect to the external magnetic field. B…

非定域QED中存在非定域诱导规范场action

Nonlocal QED admits a finitely induced gauge field action

这封信重新考虑了结果获得克雷蒂安和Peierls在1954年内nonlocal QED在4D [Proc。Soc.London A 223，468]。从二次量子化费米子开始，费米子受到非定域作用，核$[ i\not\partial_x a(x) - m b(x)]$和规范协变耦合到外部U（1）规范场，他们发现，对于$a = b$，诱导的规范场作用不能是有限的，而与非定域$a$ $(= b)$的选择无关。但是，自然要研究的一般情况$a \neq b$，就像这封信所证明的那样，允许有一个由磁感应引起的规范场作用。

Decoherence of Dirac-particle quantumness for fermionic fields in a dilatonic black hole

The quantumness of Dirac paticles for quantized fields in a dilatonic black hole is estimated by means of quantum channel. We develop a general Bloch vector representation of quantum channel in black hole spacetimes beyond single mode approximation. The nonclassicality of Dirac particles can be measured by the minimization of quantum coherence over all orthonormal basis sets. The quantumness of the channel decreases as the dilaton parameter increases. The interplay between the external reservoir noise and dilaton black hole on the dynamical behavior of quantum coherence and steerability is inv…

Nonlocal vertices and analyticity: Landau equations and general Cutkosky rule

We study the analyticity properties of amplitudes in theories with nonlocal vertices of the type occurring in string field theory and a wide class of nonlocal field theory models. Such vertices are given in momentum space by entire functions of rapid decay in certain (including Euclidean) directions ensuring UV finiteness but are necessarily of rapid increase in others. A parametric representation is obtained by integrating out the loop (Euclidean) momenta after the introduction of generalized Schwinger parameters. Either in the original or parametric representation, the well-defined resulting…

非局部标量场论中的点状电荷与狄利克雷边界条件

Point-Like Charges and Dirichlet Boundary Conditions in a Nonlocal Scalar Field Theory

研究非局部标量场论中外部源和物质边界产生的效应，通过修改的克莱因 - 戈登场论模型，分析点状电荷相互作用、狄利克雷平面相关情况，证明镜像法失效并与其他理论比较结果。

强磁场中嵌入刚性旋转介质的费米子电磁辐射的准经典近似

Quasi-Classical Approximation of Electromagnetic Radiation by Fermions embedded in Rigidly Rotating Medium in Strong Magnetic Field

本文提出强磁场中均匀旋转系统内费米子同步辐射的准经典WKB近似方法，证明其以极低数值成本精确逼近精确解，可用于计算重离子碰撞中夸克-胶子等离子体的电磁辐射。

外电磁场中的非相对论性任意子

Nonrelativistic anyons in external electromagnetic field

我们以前提出的非相对论性任意子（等同于具有非对易坐标的平面中的粒子）的一阶无限分量场方程被推广到适应任意背景电磁场。一致耦合的基本经典系统的任意字段的介绍，在一个临界值的磁场，粒子遵循霍尔运动定律。当磁场不均匀时，相应的量子化系统会表现出隐藏的非定域性。在量子朗道问题中，发现了谱和态结构（有限与无限）的不对称性。被临界磁场相位分开的束缚态和散射态表现为进一步的、不同的相位。