Chiral drag force

Rajagopal, Krishna; Sadofyev, Andrey V.

doi:10.1007/JHEP10(2015)018

Title: Chiral drag force

Abstract

Here, we provide a holographic evaluation of novel contributions to the drag force acting on a heavy quark moving through strongly interacting plasma. The new contributions are chiral in the sense that they act in opposite directions in plasmas containing an excess of left- or right-handed quarks. The new contributions are proportional to the coefficient of the axial anomaly, and in this sense also are chiral. These new contributions to the drag force act either parallel to or antiparallel to an external magnetic field or to the vorticity of the fluid plasma. In all these respects, these contributions to the drag force felt by a heavy quark are analogous to the chiral magnetic effect (CME) on light quarks. However, the new contribution to the drag force is independent of the electric charge of the heavy quark and is the same for heavy quarks and antiquarks, meaning that these novel effects do not in fact contribute to the CME current. We show that although the chiral drag force can be non-vanishing for heavy quarks that are at rest in the local fluid rest frame, it does vanish for heavy quarks that are at rest in a suitably chosen frame. In thismore »« less

Authors:

Rajagopal, Krishna ^[1]; Sadofyev, Andrey V. ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); ITEP, Moscow (Russia)

Publication Date:: 2015-10-05

Research Org.:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1435622

Grant/Contract Number:: SC0011090

Resource Type:: Accepted Manuscript

Journal Name:: Journal of High Energy Physics (Online)

Additional Journal Information:: Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2015; Journal Issue: 10; Journal ID: ISSN 1029-8479

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Quark-Gluon Plasma; Holography and quark-gluon plasmas; Anomalies in Field and String Theories

Citation Formats


                    Rajagopal, Krishna, and Sadofyev, Andrey V. Chiral drag force.  United States: N. p., 2015. 
Web.  doi:10.1007/JHEP10(2015)018.

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                    Rajagopal, Krishna, & Sadofyev, Andrey V. Chiral drag force.  United States.  https://doi.org/10.1007/JHEP10(2015)018

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                    Rajagopal, Krishna, and Sadofyev, Andrey V. Mon .  
"Chiral drag force".  United States.  https://doi.org/10.1007/JHEP10(2015)018.  https://www.osti.gov/servlets/purl/1435622.

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@article{osti_1435622,

  title        = {Chiral drag force},

  author       = {Rajagopal, Krishna and Sadofyev, Andrey V.},

  abstractNote = {Here, we provide a holographic evaluation of novel contributions to the drag force acting on a heavy quark moving through strongly interacting plasma. The new contributions are chiral in the sense that they act in opposite directions in plasmas containing an excess of left- or right-handed quarks. The new contributions are proportional to the coefficient of the axial anomaly, and in this sense also are chiral. These new contributions to the drag force act either parallel to or antiparallel to an external magnetic field or to the vorticity of the fluid plasma. In all these respects, these contributions to the drag force felt by a heavy quark are analogous to the chiral magnetic effect (CME) on light quarks. However, the new contribution to the drag force is independent of the electric charge of the heavy quark and is the same for heavy quarks and antiquarks, meaning that these novel effects do not in fact contribute to the CME current. We show that although the chiral drag force can be non-vanishing for heavy quarks that are at rest in the local fluid rest frame, it does vanish for heavy quarks that are at rest in a suitably chosen frame. In this frame, the heavy quark at rest sees counterpropagating momentum and charge currents, both proportional to the axial anomaly coefficient, but feels no drag force. This provides strong concrete evidence for the absence of dissipation in chiral transport, something that has been predicted previously via consideration of symmetries. Along the way to our principal results, we provide a general calculation of the corrections to the drag force due to the presence of gradients in the flowing fluid in the presence of a nonzero chemical potential. We close with a consequence of our result that is at least in principle observable in heavy ion collisions, namely an anticorrelation between the direction of the CME current for light quarks in a given event and the direction of the kick given to the momentum of all the heavy quarks and antiquarks in that event.},

  doi          = {10.1007/JHEP10(2015)018},

  journal      = {Journal of High Energy Physics (Online)},

  number       = 10,

  volume       = 2015,

  place        = {United States},

  year         = {2015},

  month        = {10}

}

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