https://home.cern/science/physics/higgs-boson/what#:~:text=A%20spontaneously%20broken%20symmetry%20is,upsetting%20the%20symmetry%20of%20physics.&text=The%20way%20this%20works%20for,particle%20properties%20we%20observe%20today.
http://csep10.phys.utk.edu/OJTA2dev/ojta/c2c/early/inflationary/cosmology_tl.html#:~:text=Unified%20Theories&text=Only%20when%20the%20temperature%20dropped,see%20in%20our%20present%20Universe.
https://www.futurelearn.com/info/courses/mysteries-of-the-universe/0/steps/216503
Physics in the Scalar Era
https://ippog.org/node/624