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A Matter-Antimatter Universe?

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arxiv astro-ph/9707087 v2 pith:WWIOOV5D submitted 1997-07-07 astro-ph hep-ph

classification astro-phhep-ph
keywords universebackgroundcosmicmattermatter-antimatterannihilationantimatteravoid
verification ladder T0 review T1 audit T2 compute T3 formal
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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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  1. Unveiling the inert Triplet desert region with a pNGB Dark Matter and its Gravitational Wave signatures

    hep-ph 2025-05 conditional novelty 6.0 of 10

    A two-component dark matter model combining an inert scalar triplet with a pseudo-Goldstone singlet revives the sub-TeV triplet desert region and predicts gravitational waves detectable by LISA, BBO, and DECIGO.

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