Antimatter Universe: Same or Different?

AI Thread Summary
An antimatter universe might exhibit similarities to our own, but subtle differences could arise from the distinct decay properties of particles versus antiparticles. While some believe it would be a reverse version of our universe, others argue that any discernible differences are currently unknown. The discussion highlights the mystery surrounding why our universe is predominantly matter, suggesting that understanding this could clarify the nature of an antimatter universe. The possibility of a parallel antimatter universe raises questions about the boundary between the two. Overall, the concept remains speculative, with many unanswered questions about the fundamental differences between matter and antimatter.
abuguchie
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What would the universe be like in contrast to what it is now if it were made out of antimatter? Or would it be exactly the same?
Thanks.
 
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There might be slight differences, since there is some difference in the decay properties of particles compared to anti-particles.
 
My guess is that it would be reverse to ours ? Just as Richard feynman had described about anti-matter.
By the way I just read an article stating the creation of the anti-particle counterpart of Helium-4
 
What would be reverse about it? As fas as I know there would be almost no discernible differences between ours and their universes.
 
The first thought is, it would be the same. However there is some reason, still unknown to us, why our universe is predominantly matter. Was it really just random chance? Without an understanding of that issue, it's impossible to answer your question. There are apparently differences between matter and antimatter which we have not yet discovered. An antimatter universe sounds possible, but may not be.
 
Could there be an antimatter universe parallel to ours? If so what would the "boundary" between the two be like?
 

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