Standard Model of Physics
The Standard Model of Physics is a comprehensive theory that describes three of the four fundamental forces (electromagnetic force, strong nuclear force, weak nuclear force, but not gravity) in the universe; it attempts to classify all known elementary particles. It has its origins in the late 20th century CE, finalized ~1970s CE when quarks were confirmed by experiment. Since then, additional proofs have been discovered for the top quark (1995 CE), the tau neutrino (2000 CE), and the Higgs boson (2012 CE), all of which lend further credence to the model's accuracy.
Despite its accuracy and repeated confirmation via experiment, it fails to adequately explain all physical phenomena (and so can't be considered a unified Theory of Everything in any complete sense).
What Gaps?
- Baryon asymmetry
- gravitation
- accelerating expansion of Universe
- no dark matter / energy
- no accounting for neutrino oscillations, non-zero masses
- quantum mechanics
- hierarchy problem
- 19 parameters - origin of values?
- Strong CP Problem