Strong Magnetic Fields in QCD Lattice Calculations P.V.Buividovich ( ITEP, JINR ) ‏, M.N.Chernodub (LMPT, Tours University, ITEP) ‏, E.V.Luschevskaya (ITEP,

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Presentation transcript:

Strong Magnetic Fields in QCD Lattice Calculations P.V.Buividovich ( ITEP, JINR ) ‏, M.N.Chernodub (LMPT, Tours University, ITEP) ‏, E.V.Luschevskaya (ITEP, JINR) ‏, M.I.Polikarpov (ITEP) ‏ NICA Roundtable Workshop IV

Some slides are made by M.N. Chernodub, P.V. Buividovich and by D.E. Kharzeev

Overview Lattice simulations with magnetic fields Chiral symmetry breaking: Dirac eigenmodes and their localization Magnetization of the vacuum: first lattice results Chiral Magnetic Effect Quark electric dipole moment

Magnetic fields in non-central collisions The medium is filled with electrically charged particles Large orbital momentum, perpendicular to the reaction plane Large magnetic field along the direction of the orbital momentum

T We calculate in the external magnetic field and in the presence of the vacuum gluon fields

T We consider SU(2) gauge fields and quenching approximation

Effects observed at very strong magnetic fields on the lattice 1. Enhancement of the chiral condensate (arXiv: ) + talk of E.V. Luschevskaya 2. Magnetization of the QCD vacuum (arXiv: ) 3. Chiral Magnetic Effect (arXiv: ) + talk of P.V. Buividovich 4. We observe very large correlation between quark electric dipole moment and chirality (not yet published)

Chiral condensate vs. field strength We are in agreement with the chiral perturbation theory: the chiral condensate is a linear function of the strength of the magnetic field!

Magnetic susceptibility - results

Chiral Magnetic Effect [Fukushima, Kharzeev, Warringa, McLerran ’07-’08] Electric current appears at regions 1. with non-zero topological charge density 2. exposed to external magnetic field

Chiral Magnetic Effect on the lattice, qualitative picture Density of the electric charge vs. magnetic field

Chiral Magnetic Effect on the lattice, qualitative picture Non-zero field, subsequent time slices

Chiral Magnetic Effect on the lattice, qualitative picture Effect of field increasing

Magnetic fields in non-central collisions The medium is filled with electrically charged particles Large orbital momentum, perpendicular to the reaction plane Large magnetic field along the direction of the orbital momentum

Magnetic fields in non-central collisions The medium is filled with electrically charged particles Large orbital momentum, perpendicular to the reaction plane Large magnetic field along the direction of the orbital momentum Instanton

Chiral Magnetic Effect on the lattice, RESULTS and QUESTIONS D. Leinweber Topological charge density after vacuum cooling S.Morozov, F.Gubarev, M.Polikarpov, V. Zakharov Density of eigenfunctions of the Dirac equation in not cooled vacuum

Electric dipole moment of quark  Large correlation between square of the electric dipole moment and chirality

Effects observed at very strong magnetic fields on the lattice 1. Enhancement of the chiral condensate (arXiv: ) + talk of E.V. Luschevskaya 2. Magnetization of the QCD vacuum (arXiv: ) 3. Chiral Magnetic Effect (arXiv: ) + talk of P.V. Buividovich 4. We observe very large correlation between quark electric dipole moment and chirality (not yet published)

Our plans 1. SU(2) -> SU(3) (in progress) 2. Finite chemical potential m (in progress) 3. Dynamical quarks (fermionic determinant sign problem at finite magnetic field)