MG15 - Talk detail |
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Participant |
Matos, Tonatiuh | |||||||
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Institution |
Departamento de Física, Centro de Investigación y de Estudios Avanzados del IPN - Av. Politecnico 2508, Col. Sn. Pedro Zacatenco, Del. Gustavo A. Madero - Mexico-city - CDMX - Mexico | |||||||
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Session |
BS2 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
The Galaxy Center with Scalar Field Dark Matter (Ultra-Light Boson) Haloes. | |||||
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Abstract |
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_0/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^−21eV/c^2, which puts the SFDM model in agreement with recent cosmological constraints. |
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Pdf file |
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Session |
AT3 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
Exact Rotating Magnetic Traversable Wormholes satisfying the Energy Conditions | |||||
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Abstract |
In this talk we wonder if there is a way to generate a wormhole (WH) in nature using "normal" matter. In order to give a first answer to this question, we study a massless scalar field coupled to an electromagnetic one (dilatonic field) with an arbitrary coupling constant, as source of gravitation. We obtain an exact solution of the Einstein equations using this source that represents a magnetized rotating WH. This space-time has a naked ring singularity, but otherwise the metric is regular. We show that as in a previous cases \cite{Matos:2012} this singularity is untouchable. The WH throat lies on the disc bounded by the ring singularity, which keeps the throat open without requiring exotic matter, that means, satisfying all the energy conditions. After analyzing the geodesic motion and the tidal forces we find that a test particle can go through the WH without troubles. |
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Pdf file |
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