A Matter‐Antimatter Universe? | Zendy

Andrew G. Cohen | Zendy; A. De Rújula | Zendy; Sheldon L. Glashow | Zendy

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A Matter‐Antimatter Universe?

Author(s) -

Andrew G. Cohen,

A. De Rújula,

Sheldon L. Glashow

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/305328

Subject(s) - antimatter , physics , cosmic microwave background , universe , cosmic cancer database , astrophysics , annihilation , cosmic background radiation , astronomy , theoretical physics , particle physics , positron , quantum mechanics , electron , anisotropy

We ask whether the universe can be a patchwork consisting of distinct regionsof matter and antimatter. We demonstrate that, after recombination, it isimpossible to avoid annihilation near regional boundaries. We study thedynamics of this process to estimate two of its signatures: a contribution tothe cosmic diffuse gamma-ray background and a distortion of the cosmicmicrowave background. The former signal exceeds observational limits unless thematter domain we inhabit is virtually the entire visible universe. On generalgrounds, we conclude that a matter-antimatter symmetric universe is empiricallyexcluded.Comment: 28 pages, 5 figures, uses graphicx package; updated for Ap. J. version. Includes additional discussion of turbulenc

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