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What Could We Learn from a Sharply Falling Positron Fraction?

Abstract : Recent results from the AMS-02 data have confirmed that the cosmic-ray positron fraction increases with energy between 10 and 200 GeV. This quantity should not exceed 50%, and it is hence expected that it will either converge toward 50% or fall. We study the possibility that future data may show the positron fraction dropping down abruptly to the level expected with only secondary production, and forecast the implications of such a feature in term of possible injection mechanisms that include both dark matter and pulsars. Were a sharp steepening to be found, rather surprisingly, we conclude that pulsar models would do at least as well as dark matter scenarios in terms of accounting for any spectral cut-off.
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Submitted on : Tuesday, April 19, 2022 - 3:35:50 PM
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Timur Delahaye, Kumiko Kotera, Joseph Silk. What Could We Learn from a Sharply Falling Positron Fraction?. The Astrophysical Journal, 2014, 794, ⟨10.1088/0004-637X/794/2/168⟩. ⟨insu-03645275⟩

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