The Higgs boson doomsday theory is a speculative idea that suggests that the Higgs boson, which is responsible for giving other particles mass, could also trigger a catastrophic event known as a “vacuum instability” if its mass is too high. This vacuum instability could theoretically cause the universe to rapidly expand, destroying everything in its path. However, it should be noted that this theory is considered unlikely by most scientists, and there is currently no experimental evidence to support it. Additionally, more recent research has provided some calculations that suggest that the Higgs boson mass is lower than the range where vacuum instability can happen.