As per natural symmetricity(proton-electron),do anti-universe exists with 'anti-time' as 4th dimension?

Answer 1

The existence of anti-particles only involves switching their ELECTRIC CHARGE. It DOESN'T mean that there is "anti-time," whatever that would mean. (For example, would entropy in an "anti-time universe" always DECREASE ?! Would exponential decay become exponential growth? If sio, it sounds like a very UNSTABLE universe!)

By the way, the proton and electron are NOT examples of "natural symmetricity," because among other things, their masses are so different. This fact briefly caused some confusion when P. A. M. Dirac's original interpretation of his relativistic equation for the electron implied an anti-particle. Dirac first thought that the proton was somehow the anti-particle, but quickly realized that it couldn't be. Thus, he predicted the existence of a "positively charged electron," in other words the positron.

Calling upon the amazing verbal ingenuity and inventiveness that physicists are noted for, the proton's antiparticle became known as the anti-proton. (One marvels at this linguistic dexterity.)

Both (i) "anti-hydrogen" (an anti-proton with a positron "orbiting" it) and (ii) "positronium" (an electron and positron orbiting one another) have been observed --- if only briefly --- in specially designed accelerator experiments. These are really only demonstration examples along the lines of "it can be done." Because of the prevalence of regular matter, they (i) annihilate with regular matter or (ii) the constituents annihilate with each other, respectively.

Live long and prosper.

Answer 2

The particles and the antiparticles differ only in charge. Since time has no charge, there is no anti-time.

Answer 3

No. The existence of antiparticles does not mean there exists an antidimension, such as "antitime".

Answer 4

how do you know if time is the 4th dimension in the first place?