nitsuj
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My least favorite physics word - Entanglement
nitsuj said:My least favorite physics word - Entanglement
Antimatter is not a "mirror image" of matter. It is obtained from matter by applying the operation of charge conjugation (C). Mirror images, on the other hand, are obtained by a parity transformation (P).Alex-NL said:This is my first post on PF. Hello all.
Noting the fact that antimatter has a positive inertial mass and probably an equal, positive gravitational mass, isn't the term a misnomer? I know it has an opposite electrical charge and magnetic moment compared to normal matter, which means the two are partially each others opposites. However, I feel it is a stretch to call them mirror images of each other. Antimatter can indeed annihilate with ordinary matter, but this makes new particles, sometimes even massive ones, rather than the two cancelling each other out. I therefore propose that what is now called antimatter should really be called "complementary matter" or "Dirac matter".
I'm suggesting this renaming scheme because it's conceivable that one day "true" antimatter with a negative mass may be discovered or predicted in some theoretical framework. What would you call this stuff then?
Discuss.
That is the definition yes. My point is that it's not a very good definition. The term "conjugated matter" would then be a better in my opinion.Dickfore said:Antimatter is not a "mirror image" of matter. It is obtained from matter by applying the operation of charge conjugation (C). Mirror images, on the other hand, are obtained by a parity transformation (P).
Not that we know of and maybe it doesn't make sense within the context of our visible universe. It would make sense if our visible universe had an invisible counterpart consisting of what I call true antimatter traveling "with" it. This would solve completely the conservation of energy issue that is so awkward in big bang cosmology.EDIT:
There is no such thing as negative mass, therefore it makes no sense to reserve the term 'antimatter' for a non-existant property.
Alex-NL said:Not that we know of and maybe it doesn't make sense within the context of our visible universe. It would make sense if our visible universe had an invisible counterpart consisting of what I call true antimatter traveling "with" it. This would solve completely the conservation of energy issue that is so awkward in big bang cosmology.
I'm talking about the everything from nothing "problem". I'm not making the common error here to mean "that there's so much stuff in it and the universe is so big, it just couldn't have come from nowhere". What i mean is that, if the visible universe inflated out of something which previously existed (which isn't standard big bang cosmology) it would make sense that from the point of view of this previous verse, mass-energy was conserved. This would be the binary event that I'm suggesting.Drakkith said:Which conservation of energy issue are you referring to?