Résumé / Abstract Seminaire_IAP
« Axion Quark Nuggets: a candidate for baryonic, cold and strongly interacting dark matter »

Ludovic Van Waerbeke
Physics Astronomy Dept., Univ. British Columbia (UBC) (Vancouver, Canada)

Assuming dark matter is a particle, WIMPs-like models cover only a tiny range of the viable DM parameters space, and detection has not been particularly successful so far. Alternatives to WIMPs have greatly increased in popularity recently. A new DM candidate, the Axion Quark Nugget (AQN), has been proposed by Zhitnitsky in 2003, partly inspired by the quark nuggets (Witten 1984). In the AQN model, DM particles are stable, made of normal matter, very massive (gram mass or more) and interact very rarely, but very strongly, with the baryonic sector. They behave as cold dark matter, but their interaction with baryons can induce various electromagnetic signals under certain conditions, without violating nucleosynthesis or any known Big Bang fundamental constraints. No new physics is necessary.

In this talk I will review the basic properties of the model and discuss some of our ongoing research projects at UBC in order to test it. This requires a very interdisciplinary approach, by looking at how AQNs interact with planets, stellar atmospheres, compact objects, galaxies, up to the largest cosmological scales. This makes AQN a highly testable DM model, with potential for direct detection, unlike most currently popular alternatives to WIMPs.
vendredi 12 juin 2020 - 11:00
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
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