Reversed spatial particles look the same to us as unreversed
No they don’t; the neutrinos would change their handedness. (So would our amino acids, but that wouldn’t affect their functioning, so far as I know, since everything else would as well.) And chiral-reversed neutrinos don’t interact with anything. The laws of physics are in fact just about as P-violating as they can possibly be!
and the names “matter” and “anti-matter” are arbitrary
The names are arbitrary, but the functions aren’t; matter consists of particles favoured by the CP asymmetry in the laws. Flip everything to antimatter and after a sufficiently long time you have matter again.
In any case, flipping those things would definitely not result in a universe that goes from high entropy to low entropy, which is enough to show that you have not explained the arrow of time by those things.
No they don’t; the neutrinos would change their handedness. (So would our amino acids, but that wouldn’t affect their functioning, so far as I know, since everything else would as well.) And chiral-reversed neutrinos don’t interact with anything. The laws of physics are in fact just about as P-violating as they can possibly be!
The names are arbitrary, but the functions aren’t; matter consists of particles favoured by the CP asymmetry in the laws. Flip everything to antimatter and after a sufficiently long time you have matter again.
In any case, flipping those things would definitely not result in a universe that goes from high entropy to low entropy, which is enough to show that you have not explained the arrow of time by those things.