1.Charge conjugation (C): this symmetry involves replacing every particle in your system with its antimatter counterpart. It’s called charge conjucation because every charged particle has an opposite charge (such as electric or color charge) for its corresponding antiparticle.
2.Parity (P): this symmetry involves replacing every particle, interaction, and decay with its mirror-image counterpart.
3. Time-reversal symmetry (T): this symmetry mandates that the laws of physics affecting the interactions of particles behave the exact same ways whether you run the clock forwards or backwards in time…
On the experimental front, particle physics experiments have been operating for decades to search for violations of CPT symmetry. To significantly better precisions than 1-part-in-a-billion, CPT is observed to be a good symmetry in meson (quark-antiquark), baryon (proton-antiproton), and lepton (electron-positron) systems. Not a single experiment has ever observed an inconsistency with CPT symmetry, and that’s a good thing for the Standard Model. Ethan Siegel, “This Is The One Symmetry That The Universe Must Never Violate” at Forbes
Sounds like a designed system all right. Too bad that’s a problem for many physicists.
Most of the crackpot cosmology is developed by people who have a problem with the idea that the universe shows evidence of design, whether their bitch is the Big Bang or fine-tuning. Those people can be loads of fun as long as no one is required to take them seriously.
See also: The Big Bang: Put simply,the facts are wrong.
What becomes of science when the evidence does not matter?
and
The multiverse is science’s assisted suicide