Inflationary Big Bang theory was proposed in part due to the lack of these, whose non-existence is supported by Gauss's law of magnetism.
If predictions of some Grand Unified Theories are accurate, loops of superconducting wire a few inches in diameter should detect one of these about every year. Interest in them increased after February 14, 1982, when Blas Cabrera claimed he discovered one in an experiment that has yet to be reproduced. Inflationary Big Bang theory was proposed in part due to the lack of these, whose non-existence is supported by Gauss's law of magnetism. FTP, identify these theoretical particles with net magnetic charge.
If predictions of some Grand Unified Theories are accurate, loops of superconducting wire a few inches in diameter should detect one of these about every year.
{Magnetic monopoles}