Chiral magnetic effect at low temperature
- Department of Physics, Chung-Yuan Christian University (CYCU), Chung-Li 32023, Taiwan (China)
We investigate the chiral magnetic effect (CME) under a strong magnetic field B=B{sub 0}x-circumflex{sub 3} at low temperature T < or approx. T{sub c}{sup {chi}}. For this purpose, we employ the instanton vacuum configuration with the finite instanton-number fluctuation {delta}, which relates to the nontrivial topological charge Q{sub t}. We compute the vacuum expectation values of the local chiral density <{rho}{sub {chi}}>, chiral charge density <n{sub {chi}}>, and induced electromagnetic current <j{sub {mu}}>, which signal the CME, as functions of T and B{sub 0}. We observed that the longitudinal electromagnetic current is much larger than the transverse one, |j{sub perpendicular}/j{sub |||}{approx}Q{sub t}, and <n{sub {chi}}> is equal to |<j{sub 3,4}>|. It also turns out that the CME becomes insensitive to the magnetic field as T increases, since the instanton effect decreases. Within our framework, the instanton contribution to the CME becomes almost negligible beyond T{approx_equal}300 MeV.
- OSTI ID:
- 21313480
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 80, Issue 11; Other Information: DOI: 10.1103/PhysRevD.80.114025; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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