Orbital fingerprints of ultralight scalar fields around black holes
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Orbital fingerprints of ultralight scalar fields around black holes. / Ferreira, Miguel C.; Macedo, Caio F. B.; Cardoso, Vitor.
I: Physical Review D, Bind 96, Nr. 8, 083017, 25.10.2017.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Orbital fingerprints of ultralight scalar fields around black holes
AU - Ferreira, Miguel C.
AU - Macedo, Caio F. B.
AU - Cardoso, Vitor
PY - 2017/10/25
Y1 - 2017/10/25
N2 - Ultralight scalars have been predicted in a variety of scenarios and advocated as a possible component of dark matter. These fields can form compact regular structures known as boson stars, or-in the presence of horizons-give rise to nontrivial time-dependent scalar hair and a stationary geometry. Because these fields can be coherent over large spatial extents, their interaction with "regular" matter can lead to very peculiar effects, most notably resonances. Here we study the motion of stars in a background describing black holes surrounded by nonaxially symmetric scalar field profiles. By analyzing the system in a weak-field approach, we find that the presence of a scalar field gives rise to secular effects akin to ones existing in planetary and accretion disks. Particularly, the existence of resonances between the orbiting stars and the scalar field may enable angular momentum exchange between them, providing mechanisms similar to planetary migration. Additionally, these mechanisms may allow floating orbits, which are stable radiating orbits. We also show, in the full relativistic case, that these effects also appear when there is a direct coupling between the scalar field and the stellar matter, which can arise due to the presence of a scalar core in the star or in alternative theories of gravity.
AB - Ultralight scalars have been predicted in a variety of scenarios and advocated as a possible component of dark matter. These fields can form compact regular structures known as boson stars, or-in the presence of horizons-give rise to nontrivial time-dependent scalar hair and a stationary geometry. Because these fields can be coherent over large spatial extents, their interaction with "regular" matter can lead to very peculiar effects, most notably resonances. Here we study the motion of stars in a background describing black holes surrounded by nonaxially symmetric scalar field profiles. By analyzing the system in a weak-field approach, we find that the presence of a scalar field gives rise to secular effects akin to ones existing in planetary and accretion disks. Particularly, the existence of resonances between the orbiting stars and the scalar field may enable angular momentum exchange between them, providing mechanisms similar to planetary migration. Additionally, these mechanisms may allow floating orbits, which are stable radiating orbits. We also show, in the full relativistic case, that these effects also appear when there is a direct coupling between the scalar field and the stellar matter, which can arise due to the presence of a scalar core in the star or in alternative theories of gravity.
KW - THIN DISK GALAXIES
KW - COSMOLOGICAL PERTURBATIONS
KW - PARTICLE RESONANCE
KW - DYNAMICAL FRICTION
KW - STELLAR DYNAMICS
KW - GASEOUS MEDIUM
KW - BOSON STARS
U2 - 10.1103/PhysRevD.96.083017
DO - 10.1103/PhysRevD.96.083017
M3 - Journal article
VL - 96
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 8
M1 - 083017
ER -
ID: 299401673