In the simplest theory, the Higgs particle should be a lot heavier than it is. A new theory solves this problem with a "relaxion" field, whose value determines the Higgs mass. As the relaxion field changed its strength during the early Universe, the Higgs went from very massive to the 125 GeV mass we observe today.
A theoretical proposal ties the puzzling light mass of the Higgs particle to a hypothetical new particle that plays an important role during the big bang.
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