Re: Anti matter VS Dark matter
Nothing in physics dictates that any physical process cannot be reversible. 2nd law of thermodynamics is a law, means its the observation and so far a violation of it is not yet observed in the universe, but there is no restriction in physics that stops the entropy to flow in another direction .. that is from chaos to order ..
Arrow of time can also be explained in terms of entropy .. you are right .. but time flowing in forward direction is an observation, though in theory, time can also flow in another direction. There is no theory that prohibits that.
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Does this mean that matter-antimatter annihilation is a reversible reaction
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Yes it is. That is exactly how big bang happened.
anti-annihilation gave birth to particles and anti-particles. Some particles re-annihilated while some got separated. There is a suggestion that a part of our universe is made of anti-matter .. its just that the "matter/anti-mater parts are so far away that there is no immediate threat of a major annihilation ..
and btw, up in one of the posts, I talk about blackhole radiating particles. That also happens because of anti-annihilation.