10-17 July 2019
Europe/Brussels timezone

Where do AMS-02 anti-helium events come from?

12 Jul 2019, 12:30
Campus Ledeganck - Aud. 2 (Ghent)

Campus Ledeganck - Aud. 2


Parallel talk Cosmology Cosmology


Dr Vivian Poulin (LUPM, CNRS, France)


In this talk, I will discuss consequences of the potential detection of anti-helium-3 and -4 events by AMS-02. After showing that spallation from primary hydrogen and helium nuclei onto the ISM cannot account for the measured fluxes, I will argue that dark matter annihilation or decay face similar difficulties in explaining these events. I will then entertain the possibility that these events originate from anti-matter-dominated regions in the form of anti-clouds or anti-stars. I will finally discuss constraints due to annihilation onto normal matter that apply on such scenario.

Primary authors

Dr Vivian Poulin (LUPM, CNRS, France) PIERRE SALATI (LAPTh & Université de Savoie Mont Blanc) Marc Kamionkowski (Johns Hopkins University) ILIAS CHOLIS (Johns Hopkins University) joseph silk (IAP)

Presentation materials