Chiral magnetic response to arbitrary axial imbalance
| Autor: | Hai-cang Ren, Jinfeng Liao, De-fu Hou, Miklós Horváth |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
High Energy Physics - Theory
Nuclear Theory High Energy Physics::Lattice media_common.quotation_subject FOS: Physical sciences 01 natural sciences Asymmetry Nuclear Theory (nucl-th) Condensed Matter - Strongly Correlated Electrons High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences 010306 general physics media_common Physics Chiral anomaly Condensed Matter::Quantum Gases Charge conservation Strongly Correlated Electrons (cond-mat.str-el) Spacetime 010308 nuclear & particles physics Fermion Plasma Magnetic field High Energy Physics - Phenomenology High Energy Physics - Theory (hep-th) Quantum electrodynamics Regularization (physics) |
| Zdroj: | Physical Review |
| Popis: | The response of chiral fermions to time and space dependent axial imbalance & constant magnetic field is analyzed. The axialvector-vector-vector (AVV) three-point function is studied using a real-time approach at finite temperature in the weak external field approximation. The chiral magnetic conductivity is given analytically for noninteracting fermions. It is pointed out that local charge conservation plays an important role when the axial imbalance is inhomogeneous. Proper regularization is needed which makes the constant axial imbalance limit delicate: for static but spatially oscillating chiral charge the current of the chiral magnetic effect (CME) vanishes. In the homogeneous (but possible time-dependent) limit of the axial imbalance the CME current is determined solely by the chiral anomaly. As a phenomenological consequence, the observability of the charge asymmetry caused by the CME turns out to be a matter of interplay between various scales of the system. Possible plasma instabilities resulting from the gradient corrections to the CME current are also pointed out. 21 pages, 5 figures. v2: substantial changes of text, fig. 3 updated, practically matches journal version |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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