Gravitational Waves from Braneworld Black Holes

Seahra, Sanjeev S.

doi:10.1007/978-3-540-88460-6_9

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…In this case as well one perturbs the effective gravitational field equations on the brane, around a given bulk solution representing again a brane black hole. Some aspects of this problem along the first line of attack has already been elaborated and explored in [69][70][71][72][73][74][75], while to our knowledge the second avenue is hitherto unexplored. In this work, we wish to fill this gap by providing a thorough analysis of the second approach in relation to the black hole perturbation theory and possible discords with the bulk based approach.…”

Section: Introductionmentioning

confidence: 99%

Signatures of extra dimensions in gravitational waves from black hole quasinormal modes

et al. 2018

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In this work we have derived the evolution equation for gravitational perturbation in four dimensional spacetime in presence of a spatial extra dimension. The evolution equation is derived by perturbing the effective gravitational field equations on the four dimensional spacetime, which inherits non-trivial higher dimensional effects. Note that this is different from the perturbation of the five dimensional gravitational field equations, existing in literature, and possess quantitatively new features. The gravitational perturbation has further been decomposed into a purely four dimensional part and another piece that depends on extra dimensions. The four dimensional gravitational perturbation now admits massive propagating degrees of freedom, owing to the existence of higher dimensions. We have also studied the influence of these massive propagating modes on the quasi-normal mode frequencies, signaling the higher dimensional nature of the spacetime, and have contrasted these massive modes with the massless modes in general relativity. Surprisingly, it turns out that the massive modes experience much smaller damping compared to the massless modes in general relativity and may even dominate over and above the general relativity contribution if one observes the ringdown phase of a black hole merger event at sufficiently late times. Furthermore, the whole analytical framework has been supplemented by the fully numerical Cauchy evolution problem as well. In this context we have shown that except for minute details the overall features of the gravitational perturbations are captured in both the Cauchy evolution as well as in the analysis of quasi-normal modes. The implications on observations of black holes with LIGO and proposed space missions like LISA are also discussed.

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Section: Introductionmentioning

confidence: 99%

Signatures of extra dimensions in gravitational waves from black hole quasinormal modes

et al. 2018

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Multiway Junction Conditions for Spacetimes with Multiple Boundaries

Shen,

Peng,

2024

Phys. Rev. Lett.

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We explore the construction of gluing together an arbitrary number of spacetimes along a common interface. This provides a general tool to construct new gravitational backgrounds with multiple boundaries. We derive junction conditions across the interface, in both Einstein gravity and dilaton gravity, using two methods (1) by developing a geometrical technique of introducing an auxiliary reverse extension manifold and (2) by the variational principle. Our junction condition works for both spacelike and timelike interfaces. We illustrate applications of the junction conditions in Jackiw-Teitelboim gravity and analyze their constraints on the allowed dilaton profile. We further comment on the geometry of a web of spacetime in the presence of multiple interfaces and its resemblance to Feynman diagrams. Published by the American Physical Society 2024

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Gravitational Waves from Braneworld Black Holes

Cited by 2 publications

References 15 publications

Signatures of extra dimensions in gravitational waves from black hole quasinormal modes

Signatures of extra dimensions in gravitational waves from black hole quasinormal modes

Multiway Junction Conditions for Spacetimes with Multiple Boundaries

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