APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Da Huang (National Tsing Hua U)
Title: Multi-component dark matter from AMS-02
Date (JST): Fri, Nov 14, 2014, 13:30 - 14:30
Place: Seminar Room A
Abstract: The data on the positron fraction published by AMS-02 collaboration last and this year confirmed the excesses observed by PAMELA. Also, the Fermi-LAT data on the total e+ +e? flux also showed excess above 20 GeV. In this talk, I shall show that the multi-component leptonically decaying dark matter (DM) scenario can naturally explain these two anomalies. By performing the chi^2 fits, we find that two DM components are already enough to give a reasonable fit of both AMS-02 and Fermi-LAT data. As a byproduct, the fine structure around 100 GeV observed by AMS-02 and Fermi-LAT can be naturally explained by the dropping due to the lighter DM component. With the obtained model parameters by the fitting, we calculate the diffuse γ-ray emission spectrum in this two-component DM scenario, and find that it is consistent with the data measured by Fermi-LAT. If time is allowed, I will discuss our preliminary results of the implication of the recent release of the AMS-02 data on our model.