Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session Z10: Dark Matter Theory
3:30 PM–5:18 PM,
Tuesday, April 16, 2019
Sheraton
Room: Governor's Square 12
Sponsoring
Unit:
DAP
Chair: Rakshya Khatiwada, Fermilab
Abstract: Z10.00005 : Dark matter halos in the multicomponent inelastic model. From dwarfs to galaxy clusters*
4:18 PM–4:30 PM
View Presentation
Abstract
Presenter:
Keita Todoroki
(University of Kansas)
Authors:
Keita Todoroki
(University of Kansas)
Mikhail V. Medvedev
(University of Kansas)
A possibility of dark matter (DM) being multicomponent has a strong implication on resolving longstanding cosmological problems on small scale. The simplest two-component DM (2cDM) model with inelastic interactions has recently been shown to robustly resolve the missing satellites, core-cusp, and too-big-to-fail problems in N-body cosmological DM-only simulations tested on MW-like environments with DM halos of a virial mass ∼5×1011 Msun [1,2]. With the aim of further constraining the parameter space available for the 2cDM model, we extend our analysis to dwarf and galaxy cluster haloes with their virial mass of ∼107 Msun and ∼1015 Msun, respectively. We find that the normalized cross-sections σ/m≥0.1 cm2/g are disfavored for both dwarfs and galaxy cluster haloes, while σ/m≤0.001 cm2/g have too little effect on DM halos making them nearly indistinguishable from their CDM counterparts. We conclude that the 2cDM model can naturally resolve the above small-scale cosmological problems of DM halos across about eight orders of magnitude in their virial mass for the cross-sections σ/m∼0.1-0.001 cm2/g.
[1,2] K. Todoroki, M.V. Medvedev, MNRAS, 483, 3983 (2019); MNRAS, 483, 4004 (2019)
*Supported by DOE via grant DE-SC0016368, EPSCOR grant DE-SC0019474 and by KITP via NSF grant PHY-1748958.
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