MG15 - Talk detail |
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Participant |
Sibiryakov, Sergey | |||||||
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Institution |
EPFL - BSP 724 (Cubotron UNIL), Rte de la Sorge - Lausanne - Vaud - Switzerland | |||||||
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Session |
DM1 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
Galactic rotation curves vs. ultra-light dark matter: Implications of the soliton—host halo relation | |||||
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Abstract |
Bosonic ultra-light dark matter (ULDM) would form cored density distributions at the center of galaxies. These cores, seen in numerical simulations, admit analytic description as the lowest energy bound state solution (“soliton”) of the Schroedinger-Poisson equations. Numerical simulations of ULDM galactic halos have found an empirical scaling relation between the mass of the large-scale host halo and the mass of the central soliton. This relation implies that the peak circular velocity, measured for the host halo in the outskirts of the galaxy, should approximately repeat itself in the central region. Contrasting this prediction to the measured rotation curves of well-resolved near-by galaxies, we show that ULDM in the mass range from 10^(-22) eV to 10^(-21) eV, which has been invoked as a possible solution to the small-scale puzzles of LambdaCDM, is in tension with the data. We suggest that a dedicated analysis of the Milky Way inner gravitational potential could probe ULDM up to m~10^(-19) eV. |
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