Motion in time-periodic backgrounds with applications to ultralight dark matter haloes at galactic centers
| Autor: | Vitor Cardoso, Filipe S. Miguel, Miguel Ferreira, Francisco Duque, Mateja Bošković |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Field (physics) Scalar (mathematics) Dark matter FOS: Physical sciences Context (language use) Physics - Classical Physics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences General Relativity and Quantum Cosmology Gravitational potential High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics 010308 nuclear & particles physics Galactic Center Classical Physics (physics.class-ph) Astrophysics - Astrophysics of Galaxies High Energy Physics - Phenomenology Stars Astrophysics of Galaxies (astro-ph.GA) Halo Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Physical Review D |
| ISSN: | 0021-3640 |
| DOI: | 10.48550/arxiv.1806.07331 |
| Popis: | We consider motion in spherically symmetric but time-dependent backgrounds. This problem is of interest, for example, in the context of ultralight dark matter, where galactic haloes produce a time-dependent and periodic gravitational potential. We study the properties of motion of stars in such spacetimes, for different field strengths and frequency, and including dissipative effects. We show that orbital resonances may occur and that spectroscopic emission lines from stars in these geometries exhibit characteristic, periodic modulation patterns. In addition, we work out a fully relativistic and weak-field description of a special class of time-periodic geometries, that of scalar oscillatons. When applied to the galactic center, our results indicate that the motion of S2-like stars may carry distinguishable observational imprints of ultra-light dark matter. Comment: 26 pages, 13 figures. Accepted to Physical Review D; v2: added a few references and notes to match the published version |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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