Motion in time-periodic backgrounds with applications to ultralight dark matter halos at galactic centers
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Motion in time-periodic backgrounds with applications to ultralight dark matter halos at galactic centers. / Boskovic, Mateja; Duque, Francisco; Ferreira, Miguel C.; Miguel, Filipe S.; Cardoso, Vitor.
I: Physical Review D, Bind 98, Nr. 2, 024037, 23.07.2018.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Motion in time-periodic backgrounds with applications to ultralight dark matter halos at galactic centers
AU - Boskovic, Mateja
AU - Duque, Francisco
AU - Ferreira, Miguel C.
AU - Miguel, Filipe S.
AU - Cardoso, Vitor
PY - 2018/7/23
Y1 - 2018/7/23
N2 - 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.
AB - 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.
KW - MILKY-WAY
KW - REDSHIFT
KW - SOLITONS
KW - SHIFTS
KW - STARS
U2 - 10.1103/PhysRevD.98.024037
DO - 10.1103/PhysRevD.98.024037
M3 - Journal article
VL - 98
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 2
M1 - 024037
ER -
ID: 299201670