Gravitational waves and higher dimensions: Love numbers and Kaluza-Klein excitations
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Gravitational waves and higher dimensions : Love numbers and Kaluza-Klein excitations. / Cardoso, Vitor; Gualtieri, Leonardo; Moore, Christopher J.
I: Physical Review D, Bind 100, Nr. 12, 124037, 16.12.2019.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Gravitational waves and higher dimensions
T2 - Love numbers and Kaluza-Klein excitations
AU - Cardoso, Vitor
AU - Gualtieri, Leonardo
AU - Moore, Christopher J.
PY - 2019/12/16
Y1 - 2019/12/16
N2 - Gravitational-wave observations provide a wealth of information on the nature and properties of black holes. Among these, tidal Love numbers or the multipole moments of the inspiraling and final objects are key to a number of constraints. Here, we consider these observations in the context of higher-dimensional scenarios, with flat large extra dimensions. We show that-as might be anticipated, but not always appreciated in the literature-physically motivated setups are unconstrained by gravitational-wave data. Dynamical processes that do not excite the Kaluza-Klein (KK) modes lead to a signal identical to that in four-dimensional general relativity in vacuum. In addition, any possible excitation of the KK modes is highly suppressed relative to the dominant quadrupolar term; given existing constraints on the extra dimensions and the masses of the objects seen in gravitational-wave observations, KK modes appear at post-Newtonian order similar to 10(11). Finally, we recompute the tidal Love numbers of spherical black holes in higher dimensions. We confirm that these are different from zero, but comparing with previous computations we find a different magnitude and sign.
AB - Gravitational-wave observations provide a wealth of information on the nature and properties of black holes. Among these, tidal Love numbers or the multipole moments of the inspiraling and final objects are key to a number of constraints. Here, we consider these observations in the context of higher-dimensional scenarios, with flat large extra dimensions. We show that-as might be anticipated, but not always appreciated in the literature-physically motivated setups are unconstrained by gravitational-wave data. Dynamical processes that do not excite the Kaluza-Klein (KK) modes lead to a signal identical to that in four-dimensional general relativity in vacuum. In addition, any possible excitation of the KK modes is highly suppressed relative to the dominant quadrupolar term; given existing constraints on the extra dimensions and the masses of the objects seen in gravitational-wave observations, KK modes appear at post-Newtonian order similar to 10(11). Finally, we recompute the tidal Love numbers of spherical black holes in higher dimensions. We confirm that these are different from zero, but comparing with previous computations we find a different magnitude and sign.
KW - BLACK-HOLES
KW - MULTIPOLE MOMENTS
KW - SCHWARZSCHILD
KW - PERTURBATIONS
KW - HIERARCHY
KW - PARTICLE
KW - GRAVITY
KW - FIELD
U2 - 10.1103/PhysRevD.100.124037
DO - 10.1103/PhysRevD.100.124037
M3 - Journal article
VL - 100
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 12
M1 - 124037
ER -
ID: 298639766