2018/06/30 by Mateja Bošković, Francisco Duque, Miguel C. Ferreira +3 · 1 citation
Physics and Astronomy · #Astronomy #Astrophysics #Context (archaeology) #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Dark matter halo #Galactic Center #Galaxies: Formation, Evolution, Phenomena #Galaxy #Halo #Physics #Proper motion #Stars #astro-ph.CO #astro-ph.GA #gr-qc #hep-ph #physics.class-ph
paper · pdf · doi:10.1103/physrevd.98.024037
published as Phys. Rev. D 98, 024037 (2018) · 26 pages, 13 figures. Accepted to Physical Review D; v2: added a few references and notes to match the published version
openalex created_date 2018/06/29 · arxiv created 2018/07/12 · openalex publication_date 2018/07/23 · arxiv updated 2018/07/31 · openalex updated_date 2026/08/05
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 ultralight dark matter.