Speaker
Description
In the framework of Einstein's General Relativity coupled with the Weinberg-Salam electroweak theory, we construct static, axially symmetric, and magnetically charged hairy black holes. Near the horizon, the strong magnetic field changes the structure of the electroweak vacuum, creating a ring-shaped condensate of massive W, Z and Higgs fields $-$ an electroweak "hair". The condensate supports up to 22% of the total magnetic charge and contains loops of electric current. In the extremal limit, the horizon is surrounded in addition by a region where the Higgs field approaches zero, restoring the full electroweak symmetry. The mass of extremal solutions is less than the total charge, $M<|Q|$, which makes them energetically favored compared to the Reissner-Nordström solution with same charge, for which $M=|Q|$. As the charge increases, we observe a phase transition where the horizon geometry changes from spherical to oblate. At this point, the extremal black holes reach a size of the order of centimeters with an approximately terrestrial mass. They may have originated from primordial black holes created in the early Universe and acquired a magnetic charge from the fluctuating ambient plasma. These black holes are appealing candidates for magnetic monopoles which do not require any new physics beyond the Standard Model and they should survive till today.
