17-22 July 2016
Master Cutlers Hall
Europe/London timezone

Bayesian study of cosmic ray propagation: evidence against homogeneous propagation and implications for indirect detection of dark matter

20 Jul 2016, 16:50
20m
Venue: Cutlers' Drawing Room (First Floor); Chair: Anne Green; Session Manager: Anthony Ezeribe ()

Venue: Cutlers' Drawing Room (First Floor); Chair: Anne Green; Session Manager: Anthony Ezeribe

Speaker

Dr. Aaron Vincent (IPPP Durham)

Description

I will present the results of Galbayes, the largest ever fully-numerical neural-network-assisted study of the cosmic ray (CR) propagation parameters. We show that in the most commonly-used diffusion-reacceleration model there is significant tension between the propagation parameters that govern protons and antiprotons, vs the light elements including B/C, which are customarily used to calibrate CR propagation codes for all species. This is due to the larger distances probed by protons and antiprotons, and suggests that the intergalactic medium is significantly different over such scales. This result has far-reaching implications in searches for dark matter, which mainly focus on electrons and protons (and their antiparticles), and are therefore using wrongly-calibrated models. I will discuss the impact of these results, as they imply 1) cosmic ray constraints using local antiprotons make use of improperly-calibrated CR propagation models; and 2) Propagation models of the galactic centre based on local results are most likely wrong, as the IGM properties are very different. This is based on results of arXiv:1602.02243.

Primary author

Dr. Aaron Vincent (IPPP Durham)

Presentation Materials

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