TY - JOUR

T1 - Perturbed black holes in Einstein-dilaton-Gauss-Bonnet gravity

T2 - Stability, ringdown, and gravitational-wave emission

AU - Blazquez-Salcedo, Jose Luis

AU - Macedo, Caio F. B.

AU - Cardoso, Vitor

AU - Ferrari, Valeria

AU - Gualtieri, Leonardo

AU - Khoo, Fech Scen

AU - Kunz, Jutta

AU - Pani, Paolo

PY - 2016/11/10

Y1 - 2016/11/10

N2 - Gravitational waves emitted by distorted black holes-such as those arising from the coalescence of two neutron stars or black holes-carry not only information about the corresponding spacetime but also about the underlying theory of gravity. Although general relativity remains the simplest, most elegant, and viable theory of gravitation, there are generic and robust arguments indicating that it is not the ultimate description of the gravitational universe. Here, we focus on a particularly appealing extension of general relativity, which corrects Einstein's theory through the addition of terms which are second order in curvature: the topological Gauss-Bonnet invariant coupled to a dilaton. We study gravitational-wave emission from black holes in this theory and (i) find strong evidence that black holes are linearly (mode) stable against both axial and polar perturbations, (ii) discuss how the quasinormal modes of black holes can be excited during collisions involving black holes, and finally (iii) show that future ringdown detections with a large signal-to-noise ratio would improve current constraints on the coupling parameter of the theory.

AB - Gravitational waves emitted by distorted black holes-such as those arising from the coalescence of two neutron stars or black holes-carry not only information about the corresponding spacetime but also about the underlying theory of gravity. Although general relativity remains the simplest, most elegant, and viable theory of gravitation, there are generic and robust arguments indicating that it is not the ultimate description of the gravitational universe. Here, we focus on a particularly appealing extension of general relativity, which corrects Einstein's theory through the addition of terms which are second order in curvature: the topological Gauss-Bonnet invariant coupled to a dilaton. We study gravitational-wave emission from black holes in this theory and (i) find strong evidence that black holes are linearly (mode) stable against both axial and polar perturbations, (ii) discuss how the quasinormal modes of black holes can be excited during collisions involving black holes, and finally (iii) show that future ringdown detections with a large signal-to-noise ratio would improve current constraints on the coupling parameter of the theory.

KW - QUASI-NORMAL MODES

KW - RADIATION

KW - SYSTEMS

U2 - 10.1103/PhysRevD.94.104024

DO - 10.1103/PhysRevD.94.104024

M3 - Journal article

VL - 94

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 10

M1 - 104024

ER -