Quark condensate in a magnetic field
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We study the dependence of quark condensate $Σ$ on an external magnetic field. For weak fields, it rises linearly with the field. Pion mass and residue are also shifted so that the Gell-Mann - Oakes - Renner relation is satisfied. In the strong field region, $Σ(H) \propto (eH)^{3/2}$.
13 pages LaTeX, 5 postscript files for figures
13 pages LaTeX, 5 postscript files for figures