Beyond the near-horizon limit: stringy corrections to heterotic black holes
Sign Up to like & getrecommendations! Published in 2019 at "Journal of High Energy Physics"
DOI: 10.1007/jhep02(2019)192
Abstract: A bstractWe study the first-order in α′ corrections to 4-charge black holes (with the Reissner-Nordström black hole as a particular example) beyond the near-horizon limit in the Heterotic Superstring effective action framework. The higher-curvature terms… read more here.
Keywords: limit stringy; horizon limit; black holes; near horizon ... See more keywords
Scattering of gravitational and electromagnetic waves off AdS2 × S2 in extreme Reissner-Nordstrom
Sign Up to like & getrecommendations! Published in 2018 at "Journal of High Energy Physics"
DOI: 10.1007/jhep07(2018)064
Abstract: A bstractThe direct product of two-dimensional anti-de Sitter spacetime with a two-sphere is an exact solution of four-dimensional Einstein-Maxwell theory without a cosmological constant. In this paper, we analytically solve the coupled gravitational and electromagnetic… read more here.
Keywords: gravitational electromagnetic; extreme reissner; near horizon; electromagnetic waves ... See more keywords
Black hole S-matrix for a scalar field
Sign Up to like & getrecommendations! Published in 2021 at "Journal of High Energy Physics"
DOI: 10.1007/jhep07(2021)017
Abstract: Abstract We describe a unitary scattering process, as observed from spatial infinity, of massless scalar particles on an asymptotically flat Schwarzschild black hole background. In order to do so, we split the problem in two… read more here.
Keywords: black hole; near horizon; hole matrix; hole ... See more keywords
Multiple Killing horizons and near horizon geometries
Sign Up to like & getrecommendations! Published in 2018 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/aaeaf1
Abstract: Near Horizon Geometries with multiply degenerate Killing horizons $\mathcal{H}$ are considered, and their degenerate Killing vector fields identified. We prove that they all arise from hypersurface-orthogonal Killing vectors of any cut of $\mathcal{H}$ with the… read more here.
Keywords: killing horizons; horizon geometries; multiple killing; degenerate killing ... See more keywords
From micro to macro and back: probing near-horizon quantum structures with gravitational waves
Sign Up to like & getrecommendations! Published in 2019 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/ab30ff
Abstract: Supermassive binaries detectable by the future space gravitational-wave interferometer LISA might allow to distinguish black holes from ultracompact horizonless objects, even when the latter are motivated by quantum-gravity considerations. We show that a measurement of… read more here.
Keywords: quantum; probing near; micro macro; back probing ... See more keywords
Non-extremal near-horizon geometries
Sign Up to like & getrecommendations! Published in 2022 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/acd980
Abstract: When Gaussian null coordinates are adapted to a Killing horizon, the near-horizon limit is defined by a coordinate rescaling and then by taking the regulator parameter ɛ to be small, as a way of zooming… read more here.
Keywords: gravity; non extremal; near horizon; extremal near ... See more keywords
Near horizon OTT black hole asymptotic symmetries and soft hair
Sign Up to like & getrecommendations! Published in 2019 at "Chinese Physics C"
DOI: 10.1088/1674-1137/43/1/013109
Abstract: We study the near horizon geometry of both static and stationary extremal Oliva Tempo Troncoso (OTT) black holes. For each of these cases, a set of consistent asymptotic conditions is introduced. The canonical generator for… read more here.
Keywords: horizon ott; black hole; near horizon; hole asymptotic ... See more keywords
Near-horizon geodesics of high spin black holes
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.101.084042
Abstract: We provide an exhaustive and illustrated classification of timelike and null geodesics in the near-horizon region of near-extremal Kerr black holes. The classification of polar motion extends to Kerr black holes of arbitrary spin. The… read more here.
Keywords: black holes; near horizon; high spin; horizon geodesics ... See more keywords
Gravitational radiation close to a black hole horizon: Waveform regularization and the out-going echo
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review D"
DOI: 10.1103/physrevd.104.104006
Abstract: Black hole perturbation theory for Kerr black holes is best studied in the Newman Penrose (NP) Formalism, in which gravitational waves are described as perturbations in the Weyl scalars ψ0 and ψ4, with the governing… read more here.
Keywords: waveform; black hole; near horizon; equation ... See more keywords
Photon emissions from near-horizon extremal and near-extremal Kerr equatorial emitters
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review D"
DOI: 10.1103/physrevd.104.124005
Abstract: We consider isotropic and monochromatic photon emissions from equatorial emitters moving along future-directed timelike geodesics in the near-horizon extremal Kerr (NHEK) and near-horizon near-extremal Kerr (near-NHEK) regions, to asymptotic infinity. We obtain numerical results for… read more here.
Keywords: near horizon; equatorial emitters; horizon extremal; photon emissions ... See more keywords
Conformal description of near-horizon vacuum states
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review D"
DOI: 10.1103/physrevd.104.126026
Abstract: Motivated by recent work suggesting observably large spacetime fluctuations in the causal development of an empty region of flat space, we conjecture that these metric fluctuations can be quantitatively described in terms of a conformal… read more here.
Keywords: horizon vacuum; conformal description; vacuum states; near horizon ... See more keywords