A Matter-Antimatter Universe?

Details A Matter-Antimatter Universe? A Matter-Antimatter Universe?

1997-07-07

arxiv.org/abs/astro-ph/9707087v2

Astrophys.J.495:539-549,1998

Astronomy and Astrophysics

Astrophysics

28 pages, 5 figures, uses graphicx package; updated for Ap. J. version. Includes additional discussion of turbulence

Scientific paper

10.1086/305328

We ask whether the universe can be a patchwork consisting of distinct regions of matter and antimatter. We demonstrate that, after recombination, it is impossible to avoid annihilation near regional boundaries. We study the dynamics of this process to estimate two of its signatures: a contribution to the cosmic diffuse gamma-ray background and a distortion of the cosmic microwave background. The former signal exceeds observational limits unless the matter domain we inhabit is virtually the entire visible universe. On general grounds, we conclude that a matter-antimatter symmetric universe is empirically excluded.

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