Exploring accretion disk physics and black hole growth with regular monitoring of ultrafast active galactic nucleus winds
Sign Up to like & getrecommendations! Published in 2017 at "Astronomische Nachrichten"
DOI: 10.1002/asna.201713338
Abstract: Fifteen years of XMM-Newton observations have established that ultrafast highly ionized winds (UFOs) are common in radio-quiet active galactic nucleus (AGN). A simple theory of Eddington-limited accretion correctly predicts the typical velocity (∼0.1c) and high… read more here.
Keywords: active galactic; accretion; black hole; physics ... See more keywords
Oblique magnetic fields and the role of frame dragging
Sign Up to like & getrecommendations! Published in 2019 at "Astronomische Nachrichten"
DOI: 10.1002/asna.201913569
Abstract: Magnetic null points can develop near the ergosphere boundary of a rotating black hole by the combined effects of strong gravitational field and the frame-dragging mechanism. The electric component does not vanish in the magnetic… read more here.
Keywords: frame dragging; rotating black; field; black hole ... See more keywords
Fourier spectral‐timing techniques for the study of accreting black holes
Sign Up to like & getrecommendations! Published in 2022 at "Astronomische Nachrichten"
DOI: 10.1002/asna.20230002
Abstract: The X-ray signal from active galactic nuclei and black hole X-ray binaries is highly variable on a range of timescales. This variability can be exploited to map the region of interest close to the black… read more here.
Keywords: black hole; fourier spectral; spectral timing; timing techniques ... See more keywords
Black hole holography and mean field evolution
Sign Up to like & getrecommendations! Published in 2017 at "Journal of High Energy Physics"
DOI: 10.1007/jhep01(2018)049
Abstract: A bstractHolographic theories representing black holes are expected to exhibit quantum chaos. We argue if the laws of quantum mechanics are expected to hold for observers inside such black holes, then such holographic theories must… read more here.
Keywords: black hole; mean field; black holes; hole holography ... See more keywords
Quantum gravity on the black hole horizon
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DOI: 10.1007/jhep01(2022)023
Abstract: We study scattering on the black hole horizon in a partial wave basis, with an impact parameter of the order of the Schwarzschild radius or less. This resembles the strong gravity regime where quantum gravitational… read more here.
Keywords: hole horizon; horizon; black hole; quantum gravity ... See more keywords
Equivalence of JT gravity and near-extremal black hole dynamics in higher derivative theory
Sign Up to like & getrecommendations! Published in 2022 at "Journal of High Energy Physics"
DOI: 10.1007/jhep01(2022)124
Abstract: Two derivative Jackiw-Teitelboim (JT) gravity theory captures the near-horizon dynamics of higher dimensional near-extremal black holes, which is governed by a Schwarzian action at the boundary in the near-horizon region. The partition function corresponding to… read more here.
Keywords: dynamics higher; black hole; near extremal; higher derivative ... See more keywords
Properties of discrete black hole hair
Sign Up to like & getrecommendations! Published in 2019 at "Journal of High Energy Physics"
DOI: 10.1007/jhep02(2019)117
Abstract: Abstract We revisit the physical effects of discrete ℤ p gauge charge on black hole thermodynamics, building on the seminal work of Coleman, Preskill, and Wilczek. Realising the discrete theory from the spontaneous breaking of… read more here.
Keywords: black hole; hole; properties discrete; hole hair ... See more keywords
Expanding the black hole interior: partially entangled thermal states in SYK
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DOI: 10.1007/jhep02(2019)156
Abstract: A bstractWe introduce a family of partially entangled thermal states in the SYK model that interpolates between the thermo-field double state and a pure (product) state. The states are prepared by a euclidean path integral… read more here.
Keywords: black hole; entangled thermal; hole; thermal states ... See more keywords
Compton black-hole scattering for s ≤ 5/2
Sign Up to like & getrecommendations! Published in 2022 at "Journal of High Energy Physics"
DOI: 10.1007/jhep02(2022)156
Abstract: Abstract Quantum scattering amplitudes for massive matter have received new attention in connection to classical calculations relevant to gravitational-wave physics. Amplitude methods and insights are now employed for precision computations of observables needed for describing… read more here.
Keywords: higher spin; black hole; physics; compton black ... See more keywords
Inelastic black hole scattering from charged scalar amplitudes
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DOI: 10.1007/jhep03(2018)044
Abstract: A bstractWe explain how the lowest-order classical gravitational radiation produced during the inelastic scattering of two Schwarzschild black holes in General Relativity can be obtained from a tree scattering amplitude in gauge theory coupled to… read more here.
Keywords: scattering charged; double copy; hole scattering; black hole ... See more keywords
Supersymmetric black hole non-uniqueness in five dimensions
Sign Up to like & getrecommendations! Published in 2019 at "Journal of High Energy Physics"
DOI: 10.1007/jhep03(2019)105
Abstract: A bstractWe present a systematic study of the moduli space of asymptotically flat, supersymmetric and biaxisymmetric black hole solutions to five-dimensional minimal supergravity. Previously, it has been shown that such solutions must be multi-centred solutions… read more here.
Keywords: black hole; nontrivial topology; hole; spherical black ... See more keywords