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Fraser
2008-Oct-31, 11:50 PM
Say the word "antimatter" and immediately people think of science fiction anti-universes, fuel for the Enterprise's warp-speed engines and so forth. But Captain, we can't change the laws of physics; antimatter is the real deal. Antimatter is made up of elementary particles, each of which has the same mass as their corresponding [...]

More... (http://www.universetoday.com/2008/10/31/chandra-telescope-searches-for-antimatter/)

GOURDHEAD
2008-Nov-03, 02:32 PM
From the linked article:

"If clumps of matter and antimatter existed next to each other before inflation, they may now be separated by more than the scale of the observable Universe, so we would never see them meet," said Gary Steigman of The Ohio State University, who conducted the study. "But, they might be separated on smaller scales, such as those of superclusters or clusters, which is a much more interesting possibility."

In that case, collisions between two galaxy clusters, the largest gravitationally-bound structures in the Universe, might show evidence for antimatter. X-ray emission shows how much hot gas is involved in such a collision. If some of the gas from either cluster has particles of antimatter, then there will be annihilation and the X-rays will be accompanied by gamma rays.If they existed next to each other, wouldn't the homogeniety of the mixing defeat the attempt of separation by inflation? Such questions are often avoided by reminding us that we know too little about what went on prior to T0 + 10^-43 seconds. A reasonable guess seems to be that the non-spacetime portion of existence would have been purely photonic at frequencies many orders of magnitude above that of gamma radiation--say hyper-gammas. Also, the nature of spacetime would have been that it was unable to accommodate these levels of energy density. So, it reacted by inflating and allowing the hyper-gammas to "generate" matter/anti-matter pairs of hyper-massive particles setting in motion the cascading progression to a more mass intense and less photon intense universe within a rapidly expanding volume of spacetime. It seems unlikely that all but one billionth of the primordial energy resides in a photonic state or is embedded in the nature and structure of spacetime.

Assuming that gravitational attraction travels at the speed of light, wouldn't the largest gravitationally bound unit be the observable universe?