Collapsing defects in the Universe's structure may generate antimatter excess.
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References
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Bevis, N., Hindmarsh, M., Kunz, M. & Urrestilla, J. Phys. Rev. Lett. 100, 021301 (2008).
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Parsons, P. Cosmic strings could solve positron mystery. Nature (2009). https://doi.org/10.1038/news.2009.143
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DOI: https://doi.org/10.1038/news.2009.143