Q-balls and the chiral vortical effect
Zakhar Khaidukov
本文考虑了由于Q球的存在而产生的沿旋转轴方向的轴向电流存在的可能性。
The paper considers the possibility of the existence of the axial current, that is directed along the axis of rotation and arises due to the presence of the Q-ball.
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Contribution of the thermal mass to the chiral vortical effect and magnetobaryogenesis
本研究利用费米子有效热质量证明热平衡非手征电弱等离子体中可存在手征涡旋效应，指出汤川相互作用贡献不抵消，小瞬态涡旋涨落可激活该效应并在早期宇宙产生超磁场与正反物质不对称。
We study the contribution of temperature-dependent chiral vortical effect to the generation and evolution of the hypermagnetic fields and the matter-antimatter asymmetries, in the symmetric phase of the early Universe, in the temperature range $100\mbox{GeV} \le T\le 10\mbox{TeV}$. Our most important result is that, due to the chiral vortical effect, small overlapping transient fluctuations in the vorticity field in the plasma and temperature of matter degrees of freedom can lead to the generation of strong hypermagnetic fields and matter-antimatter asymmetries, all starting from zero initial …
We study collective excitations in rotating chiral media in presence of magnetic field both in hydrodynamic framework and in kinetic theory. We find that the velocity of the mixed Chiral Magnetic-Vortical Wave is a vector sum of velocities of pure Magnetic and Vortical waves which do not exist separately under these conditions. We also use relaxation time approximation to prove that this wave itself is a non-dissipative phenomenon.
We revisit the evaluation of the chiral vortical effect in the accelerated matter. To first order in the acceleration the corresponding matrix element of the axial current can be reconstructed from the flat-space limit. A crucial point is the existence in the this case of an extra conservation law of fluid helicity. As a result, the chirality of the microscopic degrees of freedom and helicity of the macroscopic motion are separately conserved. This separation persists also in presence of gravity. Implications for the thermal chiral vortical effect are discussed.
We consider the system of relativistic rotating fermions in the presence of rotation. The rotation is set up as an enhancement of the angular momentum. In this approach the angular velocity for the angular momentum plays the same role as the chemical potential for density. We calculate the axial current using the direct solutions of the Dirac equation with the MIT bag boundary conditions. Next, we consider the alternative way of the rotation description, in which the local velocity of the substance multiplied by the chemical potential serves as the effective gauge field. In this approach this …
The vortical susceptibility of chiral condensate is derived in two ways. First we obtain this using the spectrum of the Dirac operator in a metric of a curved space-time, which corresponds to rotation. Second we come to the expression for the susceptibility via the holographic approach to QCD.
Chiral Vortical Transport under Minimal-Length Deformations in Rotating Relativistic Matter
本文研究最小长度形变对手征涡旋效应的影响，发现各向同性态密度修正不改变领头反常相关响应，但通过高阶热和化学势贡献改变涡旋输运，且正最小长度参数减小电导率。
We perform an explicit calculation of the axial current at finite rotation and temperature in curved space. We find that finite curvature and mass corrections to the chiral vortical effect satisfy a relation of the chiral gap effect, that is, a fermion mass-shift by a scalar curvature. We also point out that a product term of the angular velocity and the scalar curvature shares the same coefficient as the mixed gravitational chiral anomaly. We discuss possible applications of the curvature induced chiral vortical effect to rotating astrophysical compact objects described by the Kerr metric. In…
Chiral Magnetic and Vortical Effects in Higher Dimensions at Weak Coupling
手征磁效应和手征涡效应是起源于手征反常的宇称奇输运现象，并推广到四维以上的所有偶维时空。本文利用实时微扰理论的图解方法，计算了偶维手征费米子理论在弱耦合极限下的P-奇延迟响应函数。我们还澄清了必要的Kubo公式计算的P-奇延迟关联函数和相关的反常输运系数。我们推测的8倍分类的拓扑相位。
Non-perturbative Suppression of Chiral Vortical Effect in Hot (s)QGP for Hyperons Spin Polarization in Heavy Ion Collisions
本研究利用QCD的场关联子方法，揭示非微扰相互作用会修正热(s)QGP中的手征涡旋效应，其数值抑制程度与RHIC-STAR超子自旋极化数据的唯象抑制相当，参数范围可覆盖ALICE和RHIC数据。
We study coefficients of axial chiral vortical effect and chiral separation effect at finite temperature and vector chemical potential in massive theories. We present two independent methods of calculating the coefficients: one from field theory and the other using the mass term in axial anomaly equation. An ambiguity in the integration constant similar to hydrodynamic approach to axial chiral vortical effect exists in the latter, but can be fixed naturally in the presence of mass. We obtain perfect agreement between the methods. The results of axial chiral vortical effect and chiral separatio…
Axial Magnetic Effect and Chiral Vortical Effect with free lattice chiral fermions
根据Braguta等人最近的工作，通过测量能流对恒定轴向磁场的响应，间接计算了具有自由晶格重叠费米子的手征涡旋电导率。我们发现，测量污染非常大的有限体积文物。然而，有限温度在手征涡导（T^2/12）的贡献的连续性结果仍然重现在无限体积在固定温度的限制。
We discuss the type of the general macroscopic parity-violating effects, when there is the current along the vortex, which is concentrated in the vortex core. We consider vortices in superfluids, which contain the Weyl points. In the vortex core the positions of the Weyl points form the skyrmion structure. We show that the mass current concentrated in such a core is provided by the spectral flow through the Weyl points according to the Adler-Bell-Jackiw equation for chiral anomaly.
In this paper, we study the contribution of the chiral vortical effect, in addition to that of the chiral magnetic effect, to the evolution of the hypermagnetic field and the matter-antimatter asymmetry in the symmetric phase of the early Universe in the temperature range 100GeV < T < 10TeV. We choose a fully helical Chern-Simons wave configuration for the velocity and the hypermagnetic vector potential fields. The latter makes the plasma force-free in the absence of viscosity. We show that the most pronounced effect of the chiral vorticity is the production and initial growth of the hypermagn…
On the temperature dependence of the chiral vortical effects
我们讨论了轴向涡旋效应的温度依赖性的起源，即在旋转的手征介质中沿旋转轴产生轴向电流。我们表明，相应的输运系数取决于，在一般情况下，在一些轻弱相互作用的自由度，而不是在引力异常。我们还评论了低维缺陷在旋转介质中的作用，以及由于它们而出现的手征涡旋效应。
A Possible Higher Order Correction to the chiral Vortical Conductivity in a Gauge Field Plasma
两个环路的贡献的手征涡电导率被认为是。Kubo公式与轴向矢量电流的反常沃德恒等式一起表明，电导率的$T^2$项的系数可能存在非零修正。
In certain circumstances, chiral (parity-violating) medium can be described hydrodynamically as a chiral fluid with microscopic quantum anomalies. Possible examples of such systems include strongly coupled quark-gluon plasma, liquid helium 3He-A, neutron stars and the Early Universe. We study first-order hydrodynamics of a chiral fluid on a vortex background and in an external magnetic field. We show that there are two previously undiscovered modes describing heat waves propagating along the vortex and magnetic field. We call them the Thermal Chiral Vortical Wave and Thermal Chiral Magnetic Wa…
We employ a 3+1D anomalous hydrodynamics with initial condition generated by HIJING to simulate the chiral vortical effect and the chiral magnetic effect in heavy-ion collisions. This allows us to calculate the charge-dependent two-particle correlations with respect to the reaction plane at different collision energies and centralities. We then compare the computed results with the experimental data and give discussions on the possible background effects.
Gluon interaction introduces remarkable corrections to the magnetic polarization effects on the chiral fermions, which is known as the inverse magnetic catalysis. It is a natural speculation that the vorticity, which has many similar properties as magnetic field, would bring non-negligible contribution to the chiral rotational suppression. Using the intuitive semi-classical background field method we studied the rotation dependence of the effective strong interaction coupling. Contrary to the magnetic field case the rotation increases the effective coupling which leads to slowing down the cond…
We argue that the enhancement in the spin polarization of anti-hyperons compared to the polarization of the hyperons in noncentral relativistic heavy-ion collisions arises as a result of an interplay between the chiral and helical vortical effects. The chiral vortical effect generates the axial current of quarks along the vorticity axis while the recently found helical vortical effect generates the helicity flow -- the projection of the quark's polarization vector onto its momentum -- along the same axis. For massless fermions, the helical charge corresponds to a difference in the contribution…
(Non)-Renormalization of the Chiral Vortical Effect Coefficient
我们表明，在某些（但不是所有）情况下，手征涡效应系数的温度依赖部分是独立的耦合常数使用的参数。在有效的3维陈-西蒙斯理论的量子化的这一结果的解释也给出。在三维降维理论的语言中，手征涡旋系数的值与公式$\sum_{n=1}^\infty n=-1/12$有关。我们还表明，在动力学规范场的存在下，CVE系数不保护重整化，即使在大的$N$限制。
The generation of baryon asymmetry and hypermagnetic field by the chiral vortical effect in the presence of sphalerons
本文研究早期宇宙对称相中温度依赖的手征涡旋效应如何在 sphaleron 存在下，通过温度涨落与涡旋叠加产生手征涡旋流，从而从零初值生成强超磁场和物质-反物质不对称性，并在电弱相变开始时得到与观测一致的重子不对称性。
Chiral vortical wave and induced flavor charge transport in a rotating quark-gluon plasma
我们证明了在含有手征费米子的旋转流体系统中存在一种新的无隙集体激发，称为手征涡旋波（CVW）。CVW的微观起源于量子反常，宏观起因于涡旋效应引起的矢量和轴向电荷涨落之间的相互作用。从流体动力学方程和手征动力学理论得到的波动方程，其解决方案显示从不同的初始条件的非平凡CVW诱导的电荷输运。以重离子碰撞中的旋转夸克-胶子等离子体为例，给出了QGP中诱导味四极的形成，并估计了实验上可以测量到的λ重子的椭圆流分裂效应.
The rotation of polarization occurs for light interacting with chiral materials. It requires the light states with opposite chiralities interact differently with the materials. We demonstrate analogous rotation of polarization also exists for chiral fermions interacting with quantum electrodynamics plasma with vorticity using chiral kinetic theory. We find that the rotation of polarization is perpendicular both to vorticity and fermion momentum. The effect also exists for chiral fermions in quantum chromodynamics plasma with vorticity. It could lead to generation of a vector current when the p…
Holographic Gravitational Anomaly and Chiral Vortical Effect
我们分析了一个在作用量中含有纯规范项和混合规范-引力Chern-Simons项的全息模型。这些是手征费米子四维场论中常见的手征反常和规范-引力混合反常的全息实现。我们讨论了全息重整化，并表明规范引力陈-西蒙斯项不会引起新的分歧。然而，为了抵消在有限距离处的边界处的非本征曲率的贡献，必须添加一种新类型的反项。当规范场强度在边界上消失时，这个反项也可以使狄利克雷问题得到很好的定义。一个荷电渐近AdS黑洞是理论的一个解，作为应用，我们通过久保公式计算手征磁和手征涡导。我们发现，与T^2成比例的特征项在强耦合时也存在，并且与弱耦合结果相比，其数值没有重整化。
We consider chiral fluids, with (nearly) massless fermionic constituents, in the confining phase. Chiral vortical effect (CVE) is the flow of axial current along the axis of rotation of the fluid while the spin alignment is a non-vanishing correlation of polarizations of baryons with the axis of rotation. As the theoretical framework we use the model of pionic superfluidity induced by a non-vanishing isotopic chemical potential. We note that the average value of spin of virtual baryons reproduces the CVE. The role of defects, or vortices is crucial. The model does not apply directly to the qua…
We consider photonic vortical effect, i.e. the difference of the flows of left- and right-handed photons along the vector of angular velocity in rotating photonic medium. Two alternative frameworks to evaluate the effect are considered, both of which have already been tried in the literature. First, the standard thermal fied theory and, alternatively, Hawking-radiation-type derivation. In our earlier attempt to compare the two approaches, we found a crucial factor of two difference. Here we revisit the problem, paying more attention to details of infrared regularizations. We find out that intr…
Frequency dependence of the Chiral Vortical Effect
本文研究了自由手征费米子的相对论气体和具有全息对偶的四维强耦合共形场论的所有手征涡导和磁导率的频率依赖性。这两个系统都有规范和重力异常，我们计算它们对电导率的贡献。在能量流中的手征涡导率和手征磁导率表现出以零频率为中心的δ形式的频率依赖性。这种高度不连续的行为是包含能量动量张量的沃德恒等式的自然结果。我们讨论了这一结果的物理解释及其可能的影响，夸克-胶子等离子体离子体中产生的重离子碰撞。在附录中，我们讨论了为什么手征磁效应在轴向化学势的特定实现的一致电流中似乎消失了。
We study the effect of hotter or colder particles on the evolution of the chiral magnetic field in the early universe. We are interested in the temperature dependent term in the chiral vortical effect. There are no changes in the magnetic energy spectrum at large lengthscales but in the Kolmogorov regime we do find a difference. Our numerical results show that the Gaussian peak in the magnetic spectrum becomes negatively skewed. The negatively skewed peak can be fitted with a beta distribution. Analytically one can relate the non-Gaussianity of the distribution to the temperature dependent vor…
Chiral Vortical Instability
该研究在二阶手征流体力学框架下发现手征剪切波在高动量下可产生手征涡旋不稳定性（CVI），其能将微观手征性转化为宏观螺旋度，相关静态流是流体非线性方程的解，在重离子碰撞QCD物质、早期宇宙原初等离子体等系统中具有潜在应用价值。
We study the chiral vortical effect far from equilibrium in a strongly coupled holographic field theory. Rotation is represented as a perturbation via a gravito-magnetic field on top of a five-dimensional charged AdS Vaidya metric. We also introduce a momentum relaxation mechanism by linear scalar field backgrounds and study the CVE dynamics as function of the charges, temperature and momentum relaxation. The far from equilibrium behavior shows that the CVE builds up with a significant delay in time compared to the quasi instantaneous equilibration of the background metric. We also pay special…
Testing the chiral magnetic and chiral vortical effects in heavy ion collisions
我们设计了一个相对论性重离子碰撞中手征磁场和手征涡旋效应（CME和CVE）的测试，它只依赖于三角形反常的一般性质。结果表明，CME的电荷流$J_E$与重子流$J_B$之比$R_{EB}=J_E/J_B$对三种轻夸克（$N_f =3$）为$R^{\rm CME}_{EB} \to \infty$，对$N_f =2$为$R^{\rm CME}_{EB} = 5$;而对CVE，$R^{\rm CVE}_{EB} =0$对$N_f =3$为$R^{\rm CVE}_{EB} =0$，对$N_f =2$为$R^{\rm CME}_{EB} = 1/2$.具有轻$u,d$夸克和重$s$夸克的物理世界介于$N_f =2$和$N_f =3$情况之间;因此，CME和CVE的比率$R_{EB}$应该相差一个数量级以上。由于电荷和重子不对称性的比值与$R_{EB}$成正比，因此测量重子和电荷不对称性的涨落可以清楚地分离CME和CVE的贡献。在这两种情况下，电荷和重子数不对称性之间必须存在正相关，这可以在逐个事件的基础上进行测试。在较低的碰撞能量下，随着重子数密度的增加和CVE的潜在作用，我们预期重子数不对称性的出现。
Chiral vortical conductivities and the moment of inertia of a rigidly rotating Fermi gas
该研究基于转动与有限轴矢化学势下的Dirac方程解，用Fock-Schwinger方法推导费米子传播子，计算了刚性旋转手征费米气体的手征涡旋电导率及自旋、轨道转动惯量，证实自由费米子气体轨道转动惯量为零。
Based on a holographic model incorporating both chiral anomaly and gravitational anomaly, we study the effect of magneto-vortical coupling on transport properties of a strongly coupled plasma. The focus of present work is on the generation of a vector charge density and an axial current, as response to vorticity in a magnetized plasma. The transport coefficients parameterising the vector charge density and axial current are calculated both analytically (in the weak magnetic field limit) and also numerically (for general values of the magnetic field). We find the generation of vector charge rec…
Chiral vortical catalysis constrained by LQCD simulations
针对转动系统夸克模型缺胶子导致手征相变温度预测与格点QCD不符的问题，本研究引入角速度依赖的有效耦合修正两味Nambu--Jona-Lasinio模型，验证了手征涡旋催化效应并修正了相图临界端点位置。
Rotating photon gas exhibits a chirality separation along the angular velocity which is manifested through a generation of helicity and zilch currents. In this paper we study this system using the corresponding Wigner function and construct elements of the covariant chiral kinetic theory for photons from first principles. The Wigner function is solved order-by-order in $\hbar$ and the unconstrained terms are fixed by matching with quantum field theory results. We further consider the zilch and helicity currents and show that both manifestations of the chirality transport originate in the Berry…
We consider the notion of zilch current that was recently discussed in the literature as an alternative helicity measure for photons. Developing this idea, we suggest the generalization of the zilch for the systems of fermions. We start with the definition of the photonic zilch current in chiral kinetic theory framework and work out field-theoretical definition of the fermionic zilch using the Wigner function formalism. This object has similar properties to the photonic zilch and is conserved in the non-interacting theory. We also show that, in full analogy with a case of photons, the fermioni…
Chiral magnetovortical instability
本研究揭示外磁场下手征等离子体中由手征涡旋效应诱发的新型磁流体动力学不稳定性，其通过手征性向交叉螺旋度的转化快速放大磁场。
We develop covariant chiral kinetic theory with Landau level basis. We use it to investigate a magnetized plasma with a transverse electric field and a steady vorticity as perturbations. After taking into account vacuum shift in the latter case, we find the resulting current and stress tensor in both cases can be matched consistently with constitutive equations of magnetohydrodynamics. We find the solution in the vorticity case contains both shifts in temperature and chemical potential as well as excitations of the lowest Landau level states. The solution gives rise to an vector charge density…
The interplay of quantum anomalies with magnetic field and vorticity results in a variety of novel non-dissipative transport phenomena in systems with chiral fermions, including the quark-gluon plasma. Among them is the Chiral Magnetic Effect (CME) -- the generation of electric current along an external magnetic field induced by chirality imbalance. Because the chirality imbalance is related to the global topology of gauge fields, the CME current is topologically protected and hence non-dissipative even in the presence of strong interactions. As a result, the CME and related quantum phenomena …
We generalize the gravitational form factor for chiral fermion in vacuum, which reproduces the well-known spin-vorticity coupling. We also calculate radiative correction to the gravitational form factors in quantum electrodynamics plasma. We find two structures in the form factors contributing to the scattering amplitude of fermion in vorticity field, one is from the fermion self-energy correction, pointing to suppression of spin-vorticity coupling in medium; the other structure comes from graviton-fermion vertex correction, which does not adopt potential interpretation, but corresponds to tra…
Gravitational Anomaly and Transport
量子反常引起新的输运现象。特别地，磁场可以通过手征磁效应感生反常电流，并且相对论性流体中的涡旋也可以通过手征涡旋效应感生电流。相关的输运系数可以通过Kubo公式计算。我们评估的库博公式的异常涡传导率在弱耦合，并表明，它收到的贡献成正比的重力异常系数。重力异常引起的异常涡旋效应，即使是不带电的流体。
Chiral anomaly and local polarization effect from quantum kinetic approach
建立了一个幂展开方案来确定自旋为1/2的带电费米子在背景电磁场中满足量子动力学方程的Wigner函数。由Wigner函数同时得到了由磁场和涡量引起的矢量流和轴向矢量流。手征磁效应、手征涡旋效应和手征反常是量子动力学方程的自然结果。在重离子碰撞中，由涡度引起的轴向矢量流导致了沿涡度方向的局部极化效应。
We study a photonic analog of the chiral magnetic (vortical) effect. We discuss that the vector component of magnetoelectric tensors plays a role of "vector potential," and its rotation is understood as "magnetic field" of a light. Using the geometrical optics approximation, we show that "magnetic fields" cause an anomalous shift of a wave packet of a light through an interplay with the Berry curvature of photons. The mechanism is the same as that of the chiral magnetic (vortical) effect of a chiral fermion, so that we term the anomalous shift "chiral magnetic effect of a light." We further st…
Anomalous transport coefficients are known to be universal in the absence of dynamical gauge fields. We calculate the corrections to these universal values due to dynamical gluon fields at strong coupling, at finite temperature and finite density, using the holographic duality. We show that the consistent chiral magnetic and chiral vortical currents receive no corrections, while we derive a semi-analytic formula for the chiral separation conductivity. We determine these corrections in the large color, large flavor limit, in terms of a series expansion in the anomalous dimension $Δ$ of the axia…
We propose the new nondissipative transport effect - the appearance of axial current of thermal quasiparticles in the presence of background gravity with torsion. For the non-interacting model of massless Dirac fermions the response of the axial current to torsion is derived. The chiral vortical effect appears to be the particular case of the chiral torsional effect. The proposed effect may be observed in the condensed matter systems with emergent relativistic invariance (Weyl/Dirac semimetals and the $^3$He-A superfluid).
Anomaly related transport of Weyl fermions for Weyl semi-metals
本文提出了外尔半金属反常输运的场论模型。我们计算了电场、轴向（谷）流和能流中的手征磁场和手征涡旋效应。我们的研究结果与最近在大部分材料中使用动力学理论的分析结果一致。指出在量子场论中，动力学流必须等同于协变流。这些电流是异常的，CME表现为外尔半金属边缘的异常电荷产生/湮灭。我们讨论了一个可能的同时实验测试的手征磁和手征涡效应敏感的温度依赖性引起的重力贡献的轴向异常。
Anomalies and Transport Coefficients: The Chiral Gravito-Magnetic Effect
轴向异常引起有趣的新的输运现象，如“手征磁效应”。我们讨论了如何通过Kubo公式在弱耦合和强耦合，后者通过规范引力对偶性的相关输运系数可以研究。我们认为一个新的“手征重力磁”（或涡旋）效应敏感的混合规范重力异常的存在。
We discuss the spin, the angular momentum, and the magnetic moment of rotating chiral fermions using a kinetic theory. We find that, in addition to the chiral vortical contribution along the rotation axis, finite circular spin polarization is induced by the spin-momentum correlation of chiral fermions, which is canceled by a change in the orbital angular momentum. We point out that the eddy magnetic moment is nonvanishing due to the $g$-factors, exhibiting the chiral Barnett effect.
An anomalous hydrodynamics for chiral superfluid
本文从低能有效手征拉格朗日量出发，引入规范Wess-Zumino Witten项，导出了手征超流体的流体力学理论。它是一个零温非阿贝尔流体力学，只有超流成分。在外加电磁场和重子化学势以及轴向重子化学势的作用下，我们可以识别出正常流体力学中各种反常诱导项的类似物，包括手征涡旋效应、手征磁效应和手征电效应。作为一个例子，我们求解了基态的流体力学方程，观察到了在受限相中的手性磁效应和手性分离。
We present a novel perspective to characterize the chiral magnetic and related effects in terms of angular decomposed modes. We find that the vector current and the chirality density are connected through a surprisingly simple relation for all the modes and any mass, which defines the mode decomposed chiral magnetic effect in such a way free from the chiral chemical potential. The mode decomposed formulation is useful also to investigate properties of rotating fermions. For demonstration we give an intuitive account for a nonzero density emerging from a combination of rotation and magnetic fie…
Examining the Anomalous Nature of Chiral Effects in Thermodynamics
本文通过路径积分直接计算一般弯曲背景与局域热力学条件下的无质量费米子手征反常，发现新的热力学贡献可诱导手征分离与涡旋效应，并证明反常在全球平衡下完全消失。
In this work, we start with chiral kinetic theory and construct the spin hydrodynamic framework for a chiral spinor system. Using the 14-moment expansion formalism, we obtain the equations of motion of second-order dissipative relativistic fluid dynamics with non-trivial spin polarization density. In a chiral spinor system, the spin alignment effect could be treated in the same framework as the Chiral Vortical Effect (CVE). However, the quantum corrections due to fluid vorticity induce not only CVE terms in the vector/axial charge currents but also corrections to the stress tensor. In this fra…
Chiral Magnetic Effect from Q-balls
本文应用线性西格玛模型的一般框架，揭示了夸克-胶子等离子体中手征磁效应这一神秘现象的机制。背景磁场是由具有轴向异常的线性西格玛模型的Q球（非拓扑孤子）引起的，在背景磁场中产生电流。我们发现额外的交流电由于夸克质量项。强子Q球，玻色子婴儿星，可能是在重离子碰撞中产生的。
Relativistic heavy ion collisions represent an arena for the probe of various anomalous transport effects. Those effects, in turn, reveal the correspondence between the solid state physics and the high energy physics, which share the common formalism of quantum field theory. It may be shown that for the wide range of {field-theoretic} models, the response of various nondissipative currents to the external gauge fields is determined by the momentum space topological invariants. Thus, the anomalous transport appears to be related to the investigation of momentum space topology -- the approach de…
Non-perturbative suppression of Chiral Effects in hot QGP for $Λ/\barΛ$-hyperons spin polarization in heavy-ion collisions
本文利用场关联子方法研究了热QGP中非微扰相互作用对奇异夸克手征分离和涡旋效应的抑制，并指出其参数范围可覆盖LHC-ALICE与RHIC-STAR实验数据，为理解Λ/Λ̄超子自旋极化提供理论依据。
The chiral phase transition of QED$_3$ around the critical number of fermion flavors
在零温度和零密度条件下，研究了具有$\textit{N}_{f}$无质量费米子味的QED $_3$中手征相变的性质。为此，在朗道规范下，我们分别数值求解了裸球-邱顶点和简化球-邱顶点内费米子和玻色子传播子的耦合Dyson-Schwinger方程。研究发现，在裸顶点近似下，当费米子味数达到临界数$\textit{N}_{f,c}$时，系统经历了从Nambu-Goldstone相到Wigner相的高阶连续相变，而在简化的Ball-Chiu顶点下，系统表现出典型的二级相变特征.
We consider the question of whether Q-balls can exist in a chiral Lagrangian truncated at leading order when, in addition, the Standard Model Higgs boson couples to the pseudo-Nambu-Golstone bosons (pNGBs). In particular, we consider the so-called thin-wall limit where volume energy dominates over surface energy. It is known that the leading order chiral Lagrangian alone does not support such multi-field solutions. Augmented by the Higgs, however, we do indeed find that such solutions exist. We then study their properties numerically and, in various limits, analytically. Furthermore, since we …
Fluid/gravity model for the chiral magnetic effect
我们把STU模型看作是一个强耦合等离子体的引力对偶，其中有多个反常U（1）电流。在大部分中，我们增加了额外的背景规范场，包括外部电场和磁场对等离子体的影响。将STU模型中的化学势简化为两个，并将其解释为夸克和手征化学势，得到了相对论重离子碰撞中手征磁效应和手征涡旋效应的全息描述.这些效应形式上表现为电磁流中的一阶输运系数。我们使用流体/重力对偶性从我们的模型计算这些系数。我们也发现类似的效果，在轴向电流。最后，我们简要地讨论了我们的模型的一个变体，其中CME/CVE实现在膨胀等离子体的后期动力学。
The anomalous currents of two-flavor chiral nuclear matter in the presence of chiral imbalance are computed, using recently developed methods exploiting generalized transgression, which facilitates the evaluation of both the equilibrium partition function and the covariant currents. The constitutive relations for both the broken and unbroken phase of the theory are studied and the out-of-equilibrium nondissipative transport coefficients determined. In the superfluid phase, the vector covariant currents exhibit nondissipative chiral electric, magnetic, and vortical effects, the latter governed …
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