Chiral drag force

Rajagopal, Krishna; Sadofyev, Andrey V.

doi:10.48550/arxiv.1505.07379

Cited by 10 publications

(24 citation statements)

References 69 publications

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“…The first mode ω 1 denotes the CMW in a chiral charged fluid. Compared to CMW in neutral chiral fluid given in (19), we find a new contribution as the following:…”

Section: B Anomalous Fluid With Finite Chiral Chemical Potentialmentioning

confidence: 81%

“…Apart from explanations based on symmetry [9,18], it has been recently illustrated with an example in the context of gauge-gravity duality. Computing the drag force exerted on a heavy quark moving in a general parity violating fluid [44], the authors of [19] have found a particular setting in which the CME-or CWE-induced current flows past the heavy quark without exerting any drag force on it.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic waves in an anomalous charged fluid

et al. 2016

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We study the collective excitations in a relativistic fluid with an anomalous U (1) current. In 3 + 1 dimensions at zero chemical potential, in addition to ordinary sound modes we find two propagating modes in presence of an external magnetic field. The first one which is a transverse degenerate mode, propagates with a velocity proportional to the coefficient of gravitational anomaly; this is in fact the Chiral Alfvén wave recently found in [1]. Another one is a wave of density perturbation, namely a chiral magnetic wave (CMW). The velocity dependence of CMW on the chiral anomaly coefficient is well known. We compute the dependence of CMW's velocity on the coefficient of gravitational anomaly as well. We also show that the dissipation splits the degeneracy of CAW. At finite chiral charge density we show that in general there may exist five chiral hydrodynamic waves. Of these five waves, one is the CMW while the other four are mixed Modified Sound-Alfvén waves. It turns out that in propagation transverse to the magnetic field no anomaly effect appear while in parallel to the magnetic field we find sound waves become dispersive due to anomaly. arXiv:1509.08878v3 [hep-th]

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“…The first mode ω 1 denotes the CMW in a chiral charged fluid. Compared to CMW in neutral chiral fluid given in (19), we find a new contribution as the following:…”

Section: B Anomalous Fluid With Finite Chiral Chemical Potentialmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Hydrodynamic waves in an anomalous charged fluid

et al. 2016

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“…In ( 9), ( 10), we will use the "no-drag" frame, the frame in which the drag force will be absent if the impurity is at rest, that has been recently discussed in Refs. [9,10].…”

Section: Examplesmentioning

confidence: 99%

“…In the weak magnetic field regime as considered in Refs. [9,10], there will still be a non-dissipative anomalous current but drag force is non-zero in those situations.…”

Section: Introductionmentioning

confidence: 99%

Drag suppression in anomalous chiral media

Sadofyev

Yin

2016

Phys. Rev. D

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We study a heavy impurity moving longitudinal with the direction of an external magnetic field in an anomalous chiral medium. Such system would carry a nondissipative current of chiral magnetic effect associated with the anomaly. We show, by generalizing Landau's criterion for superfluidity, that the "anomalous component" which gives rise to the anomalous transport will not contribute to the drag experienced by an impurity. We argue on a very general basis that those systems with a strong magnetic field would exhibit an interesting transport phenomenon-the motion of the heavy impurity is frictionless, in analogy to the case of a superfluid. We demonstrate and confirm our general results with two complementary examples: weakly coupled chiral fermion gases and strongly interacting chiral liquids.

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“…We propose that a natural way to define the "rest frame" of the normal component is to insert an impu-rity, or an obstacle, obstructing the flow as it is done, e.g., in Ref. [12] for a gauge theory plasma with a heavy quark. In general, the flow will exert force on the obstacle, and if the obstacle is free to move it will accelerate until it reaches a certain velocity at which the drag, and thus acceleration, vanishes.…”

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confidence: 99%

No-Drag Frame for Anomalous Chiral Fluid

Stephanov

Yee

2016

Phys. Rev. Lett.

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We show that for an anomalous fluid carrying dissipationless chiral magnetic and/or vortical currents there is a frame in which a stationary obstacle experiences no drag, but energy and charge currents do not vanish, resembling superfluidity. However, unlike ordinary superfluid flow, the anomalous chiral currents do transport entropy in this frame. We show that the second law of thermodynamics completely determines the amounts of these anomalous non-dissipative currents in the "no-drag frame" as polynomials in temperature and chemical potential with known anomaly coefficients. These general results are illustrated and confirmed by a calculation in the chiral kinetic theory and quark-gluon plasma at high temperature.Introduction -The collective dynamics of a chiral (parity-violating) medium associated with quantum anomalies has become a subject of much attention recently. In particular, currents along the direction of an external magnetic field (chiral magnetic effect, or CME) discussed hypothetically earlier [1] have been recently proposed in Ref. [2,3] as a possible explanation of the charge dependent correlations observed in heavy-ion collisions and of negative magnetoresistance in a Diracsemimetal [4,5]. Currents in the direction of rotation axis (chiral vortical effect, or CVE) also discussed in astrophysical context before [6] have been (re)discovered in strong-coupling gauge-gravity calculations [7,8]. The generality of these effects and their connection to chiral anomaly have been demonstrated in Ref. [9,10] by applying the constraint of the second law of thermodynamics to the hydrodynamic equations for the anomalous chiral fluid.One of the manifestations of the anomalous nature of the CME and CVE currents is that these currents are dissipationless and do not lead to entropy production, in contrast, e.g., to the ordinary Ohmic current driven by electric field, but similar to the persistent superfluid currents. We wish to gain further understanding of the non-dissipative nature of the anomalous transport.How can one distinguish the anomalous CME/CVE currents from the uniform (shearless) inertial motion of the fluid as a whole in the same direction, which also does not generate entropy and carries energy and charge? To do this one needs to determine the "rest frame" of the "normal" component of the flow. This situation appears to be similar to the Landau's two-fluid picture of the superfluid [11]. The superfluid flow is also non-dissipative and carries energy (mass) and charge. Since it carries no entropy, one can define the rest frame of the normal component as the frame where the entropy flow vanishes. It is tempting to use the same criterion in the case of the anomalous CME/CVE flows. We shall show that, in general, this would not be correct, i.e., the CME/CVE currents do carry entropy.We propose that a natural way to define the "rest frame" of the normal component is to insert an impu-

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Chiral drag force

Cited by 10 publications

References 69 publications

Hydrodynamic waves in an anomalous charged fluid

Hydrodynamic waves in an anomalous charged fluid

Drag suppression in anomalous chiral media

No-Drag Frame for Anomalous Chiral Fluid

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