Speaker
Mr
Tigran Kalaydzhyan
(DESY)
Description
We study some properties of the non-Abelian vacuum in the presence of external magnetic field. Orders of magnitude of the field have been chosen to be relevant for the recent experiments with heavy ion collisions.
As a framework we used the quenched SU(3) lattice gauge theory with tadpole-improved Luescher-Weisz action and chirally invariant lattice Dirac operator. Within this approach the following results have been obtained:
* The strong enough magnetic field turns the vacuum into an anisotropic conductor with some finite conductivity along the field.
* The chiral symmetry breaking is enhanced by the magnetic field. The corresponding chiral condensate has been calculated as a function of the field.
* There are non-zero local fluctuations of both electric/chiral charge and electromagnetic current in direction of the magnetic field. These fluctuations can be recognized as an evidence of the Chiral Magnetic Effect (CME), which is observed by the STAR Collaboration in heavy ion collisions at RHIC.
* There is a paramagnetic polarization of the vacuum. The corresponding chiral magnetization as well as susceptibility has been calculated and compared with other theoretical estimations.
We have found a good coincidence of the numerics and existing experimental numbers, which is an argument in favour of validity of the quenched approximation at least for this kind of problems.
Primary author
Mr
Tigran Kalaydzhyan
(DESY)
