Some wonder about the Higgs Field that is said to give mass to all of the massless particles that it encounters (except for photons and neutrinos etc.?). I wondered where the Higgs field comes from and what powers it, if it continues to have energy go in to it, if it is subject to general relativity and sundry other questions the least of which was not 'does it continue to expand if the space-time of the Universe is expanding at an increasing pace.
Some of course say that the metrics of the mass of the Universe are changing instead of space actually increasing, because the idea is that since space is non-existence it cannot expand; it already must be everywhere infinitely except where there is mass, massless particles or fields present.
The Higgs field reportedly started existing early in the history of the big bang; some say just before inflation and some say after. The time was t ≃ 10−11 s, and the source of the energy for the Higgs Field was in the electroweak epoch when that force separated from the strong force in a symmetry breaking event.
There are some fairly exotic theories and explanations for the Higgs field. It became an low energy phenomena.
Vincent Hsu has a good, mildly technical account of the way gravity seperated first followed by the strong force from the electroweak force and how the electroweak yielded the Higgs Field
https://www.quora.com/Why-did-strong-force-split-away-from-weak-force-in-the-early-universe
It is all theory. Apparently the electroweak theory required particles to be massless and Hsu explains the Higgs field was developed theoretically as a way to allow particles to get mass.
Obviously there are myriad questions and points of view one may develop or encounter if one has some cosmology hobby time.
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