The Electroweak Phase Transition in a Magnetic Field
نویسنده
چکیده
We study the finite temperature electroweak phase transition in an external hypercharge U(1) magnetic field HY , using lattice Monte Carlo simulations. For sufficiently small fields, HY /T 2 <∼ 0.3, the magnetic field makes the first order transition stronger, but it still turns into a crossover for Higgs massesmH <∼ 80 GeV. For larger fields, we observe a mixed phase analogous to a type I superconductor, where a single macroscopic tube of the symmetric phase, parallel to HY , penetrates through the broken phase. For the magnetic fields and Higgs masses studied, we did not see indications of the expected Ambjørn-Olesen phase, which should be similar to a type II superconductor. CERN-TH/98-281 NORDITA-98/56HE November 1998 [email protected] [email protected] [email protected] [email protected] [email protected]
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