The electroweak unification, or symmetry, is a mathematical model describing the unification of two of the Four Fundamental Forces, which would take place around roughly $10^15K$.

Electromagnetism is the nature of subatomic particles to possess Charge, which results in an electric field, that can have physical effects if the value of the field is non-zero in some region.

The weak interaction is responsible for the tendency of particles to decay, as a result of interaction between subatomic nuclei. This particular process actually powers the suns Thermonuclear process, leading to the creation of helium. A slight alteration in this would shorten the sun's lifetime drastically, or prevent a sun from forming.