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http://hdl.handle.net/20.500.12386/28059
Titolo: | Covariant and 3+1 Equations for Dynamo-Chiral General Relativistic Magnetohydrodynamics | Autori: | Luca Del Zanna BUCCIANTINI, NICCOLO' |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 479 | Fascicolo: | 1 | Da pagina:: | 657 | Abstract: | The exponential amplification of initial seed magnetic fields in relativistic plasmas is a very important topic in astrophysics, from the conditions in the early Universe to the interior of neutron stars. While dynamo action in a turbulent plasma is often invoked, in the last years a novel mechanism of quantum origin has gained increasingly more attention, namely the Chiral Magnetic Effect (CME). This has been recognized in semi-metals and it is most likely at work in the quark-gluon plasma formed in heavy-ion collision experiments, where the highest magnetic fields in nature, up to B~10^18 G, are produced. This effect is expected to survive even at large hydrodynamical/MHD scales and it is based on the chiral anomaly due to an imbalance between left- and right-handed relativistic fermions in the constituent plasma. Such imbalance leads to an electric current parallel to an external magnetic field, which is precisely the same mechanism of an alpha-dynamo action in classical MHD. Here we extend the close parallelism between the chiral and the dynamo effects to relativistic plasmas and we propose a unified, fully covariant formulation of the generalized Ohm's law. Moreover, we derive for the first time the 3+1 general relativistic MHD equations for a chiral plasma both in flat and curved spacetimes, in view of numerical investigation of the CME in compact objects, especially magnetars, or of the interplay among the non-ideal magnetic effects of dynamo, the CME and reconnection. | URI: | http://hdl.handle.net/20.500.12386/28059 | URL: | http://arxiv.org/abs/1806.07114v1 https://ui.adsabs.harvard.edu/abs/2018MNRAS.479..657D https://academic.oup.com/mnras/article/479/1/657/5042289 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty1633 | Bibcode ADS: | 2018MNRAS.479..657D | Fulltext: | open |
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