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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) ‏. Strong Magnetic Fields in QCD Lattice Calculations. NICA Roundtable Workshop IV.

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Strong Magnetic Fields in QCD Lattice Calculations

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

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

  3. Overview • n Lattice simulations with magnetic fields • nChiral symmetry breaking: Diraceigenmodes and their localization • n Magnetization of the vacuum: first lattice results • n Chiral Magnetic Effect • nQuark electric dipole moment

  4. 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

  5. We calculate in the external magnetic field and in the presence of the vacuum gluon fields 3 2 1 0 T

  6. We consider SU(2) gauge fields and quenching approximation 3 2 1 0 T

  7. Effects observed at very strong magnetic fields on the lattice • 1. Enhancement of the chiral condensate(arXiv:0812.1740) + talk of E.V. Luschevskaya • 2. Magnetization of the QCD vacuum(arXiv:0906.0488) • 3. Chiral Magnetic Effect (arXiv:0907.0494) + talk of P.V. Buividovich • 4. We observe very large correlation between quark electric dipole moment and chirality (not yet published)

  8. 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!

  9. Magnetic susceptibility - results

  10. 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

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

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

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

  14. 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

  15. Magnetic fields in non-central collisions Instanton 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

  16. 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

  17. Electric dipole moment of quark yLarge correlation between square of the electric dipole moment and chirality

  18. Effects observed at very strong magnetic fields on the lattice • 1. Enhancement of the chiral condensate(arXiv:0812.1740) + talk of E.V. Luschevskaya • 2. Magnetization of the QCD vacuum(arXiv:0906.0488) • 3. Chiral Magnetic Effect (arXiv:0907.0494) + talk of P.V. Buividovich • 4. We observe very large correlation between quark electric dipole moment and chirality (not yet published)

  19. 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)

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