Cosmic Antimatter Excess Confirmed

In my opinion and in contrary to what the original posting suggests, anti-matter should not be viewed as particularly "dark".

E.g., anti-Hydrogen, consisting of an anti-proton and a positron, will readily absorb a quantum of energy (a photon, which happens to be one of the particles that are their own anti-particles) and re-emit a photon again, just like "plain old" hydrogen. Thus, a cloud of anti-hydrogen should be observable as easily (or difficultly) as a cloud of hydrogen, assuming their masses, their viewing distances and all other parameters like temperature, density etc. being equal.

So there should be no difference in observability here, due to the fact that photons are citizens of both realms, of "nornal" matter as well as of anti-matter, and will interact with mass particles of both realms in the same way.

Obviously, "dark matter" looks like a very different beast...

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/6UeEd7Rpu8w/cosmic-antimatter-excess-confirmed

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