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Anomalous transport from holography
2017-05-25  【 】【打印】【关闭

Institute of Theoretical Physics

Chinese Academy of Sciences

 Key Laboratory of Theoretical Physics

Seminar

Title

题目

Anomalous transport from holography

Speaker

报告人

卜严严

Affiliation

所在单位

哈尔滨工业大学

Date

日期

2017年5月25日(周四)上午10:00

Venue

地点

ITP NEW BUILDING 6420

Abstract

摘要

We revisit the transport properties induced by the chiral anomaly in a charged plasma holographically dual to anomalous U(1)_V*U(1)_A Maxwell theory in Schwarzschild-AdS_5. Off-shell constitutive relations for vector and axial currents are derived using various approximations. a) In a weak external field approximation, the constitutive relations have all-order derivatives resummed into six momenta-dependent transport coefficient functions: the diffusion, the electric/magnetic conductivity, and three anomaly induced functions. The latter generalise the chiral magnetic and chiral separation effects. b) Nonlinear transport is studied assuming presence of constant background external fields. The chiral magnetic effect, including all order nonlinearity in magnetic field, is proven to be exact when the magnetic field is the only external field that is turned on. Non-linear corrections to the constitutive relations due to electric and axial external fields are computed. c) For a static spatially-inhomogeneous external magnetic field, gradient corrections to CME/CSE are analytically evaluated up to third order in the derivative expansion. Some of the third order gradient corrections lead to an anomaly-induced B^2-correction to the diffusion constant. We also find non-linear in B modifications to the chiral magnetic wave (CMW).

Contact person

所内联系人

杨金民
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