Ultralight scalars and resonances in black-hole physics
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Ultralight scalars and resonances in black-hole physics. / Fujita, Ryuichi; Cardoso, Vitor.
I: Physical Review D, Bind 95, Nr. 4, 044016, 15.02.2017.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Ultralight scalars and resonances in black-hole physics
AU - Fujita, Ryuichi
AU - Cardoso, Vitor
PY - 2017/2/15
Y1 - 2017/2/15
N2 - Ultralight degrees of freedom coupled to matter lead to resonances, which can be excited when the Compton wavelength of the field equals a dynamical scale in the problem. For binaries composed of a star orbiting a supermassive black hole, these resonances lead to a smoking-gun effect: a periastron distance which stalls, even in the presence of gravitational-wave dissipation. This effect, also called a floating orbit, occurs for generic equatorial but eccentric orbits, and we argue that finite-size effects are not enough to suppress it.
AB - Ultralight degrees of freedom coupled to matter lead to resonances, which can be excited when the Compton wavelength of the field equals a dynamical scale in the problem. For binaries composed of a star orbiting a supermassive black hole, these resonances lead to a smoking-gun effect: a periastron distance which stalls, even in the presence of gravitational-wave dissipation. This effect, also called a floating orbit, occurs for generic equatorial but eccentric orbits, and we argue that finite-size effects are not enough to suppress it.
KW - POST-NEWTONIAN EXPANSION
KW - BRANS-DICKE THEORY
KW - GRAVITATIONAL-WAVES
KW - SPINNING PARTICLE
KW - KERR SPACETIME
KW - NONSPHERICAL INFALL
KW - ADIABATIC EVOLUTION
KW - INCLINED ORBITS
KW - RADIATION
KW - MOTION
U2 - 10.1103/PhysRevD.95.044016
DO - 10.1103/PhysRevD.95.044016
M3 - Journal article
VL - 95
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 4
M1 - 044016
ER -
ID: 299402864