The galaxy center with scalar field dark matter (ultra-light boson) haloes

13 Sep 2018, 10:10
20m
Talk

Speaker

Tonatiuh Matos (Cinvestav IPN, México)

Description

Recent analysis of the rotation curves of a large sample of galaxies with very diverse stellar properties reveal a relation between the radial acceleration purely due to the baryonic matter and the one inferred directly from the observed rotation curves. Assuming the dark matter (DM) exists, this acceleration relation is tantamount to an acceleration relation between DM and baryons. This leads us to a universal maximum acceleration for all halos. Using the latter in DM profiles that predict inner cores implies that the central surface density $\mu_{DM} = \rho_s r_s$ must be a universal constant, as suggested by previous studies in selected galaxies, revealing a strong correlation between the density $\rho_s$ and scale $r_s$ parameters in each profile. We then explore the consequences of the constancy of $\mu_{DM}$ in the context of the ultra-light scalar field dark matter model (SFDM). We find that for this model $\mu_{DM} = 648 M_\odot/\text{pc}^2$, and that the so-called WaveDM soliton profile should be an universal feature of the DM halos. Comparing with data from the Milky Way and Andromeda satellites, we find that they are consistent with a boson mass of the scalar field particle of the order of $10^{−21}$ eV/$c^2$, which puts the SFDM model in agreement with recent cosmological constraints.

Primary authors

Tonatiuh Matos (Cinvestav IPN, México) Luis Ureña-López (Departamento de Física, DCI, Campus León, Universidad de Guanajuato) Robles Victor H. (Department of Physics and Astronomy, University of California, Irvine, 4129 Frederick Reines Hall, Irvine)

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