Results 131 to 140 of about 4,909 (237)
European Physical Journal C: Particles and FieldsAnalyses of astrophysical observations, such as quasiperiodic oscillations (QPOs), combined with theoretical studies, help to understand the deeper properties of black hole spacetime and obtain parameters of black holes and alternative gravity theories ...
Abubakir Shermatov +7 more
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Astronomy & AstrophysicsAims. James Webb Space Telescope (JWST) observations have opened a tantalising new window onto possible black holes as early as redshifts of z ∼ 10.4.
Dayal Pratika, Maiolino Roberto
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Profile of an emission line from relativistic outflows around a black hole
, 2000 Recent observations show strong evidence for the presence of Doppler-shifted emission lines in the spectrum of both black hole candidates and active galactic nuclei. These lines are likely to originate from relativistic outflows (or jets) in the vicinity
Yuan, YF +4 more
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Non-trivial saddles in microscopic description of black holes
Journal of High Energy PhysicsNon-trivial gravitational saddles have played a key role in the island proposal for the black hole information paradox. It is worth asking if non-trivial saddles exist in microscopic descriptions of black holes.
Pranav Kumar, Swapnamay Mondal
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Constraints on the Sen black hole mass and charge from quasi-periodic oscillations
European Physical Journal C: Particles and FieldsWe analyze quasi-periodic oscillation data from selected X-ray binary systems hosting black holes. To model the spacetime geometry, we resort to the static Sen solution—originally derived in the framework of heterotic string theory—which reduces to the ...
Kuantay Boshkayev, Marco Muccino
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A comparative artificial neural networks for Schwarzschild black hole (SBH) radius
Physics OpenIt is consensus among researchers that the data for the black holes is complicated and extremely non-linear in nature. Therefore, it remains a challenging task for them to predict the key characteristics of concerned black holes accurately.
Khalil Ur Rehman +2 more
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Hawking radiation: from astrophysical black holes to analogous systems in lab
, 2018 The aim of this book is to provide the reader with a guide to Hawking radiation through a dual approach to the problem. In the first part of the book, we summarize some basic knowledge about black holes and quantum field theory in curved spacetime.
Belgiorno, Francesco D +5 more
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Thermal statistical ensembles of black holes
, 2007 International audienceWe consider statistical ensembles of Schwarzschild black holes and prove that these ensembles describe black holes of nonvanishing temperatures.
Chevalier, Claire +2 more
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Neutron star oscillations from starquakes
, 2014 Glitches are sudden increases in the otherwise extremely regular spin rate of pulsars. One theory proposed to account for these glitches is the starquake model, in which the spinup is caused by a sudden rearrangement of the neutron star crust. Starquakes
Keer, Lucy
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Why astrophysical black holes do not have horizons, and what it means if they do
, 2023 Do astrophysical black holes observed by LIGO and EHT actually trap light We argue that properties of the near-horizon regions, such as an atmosphere of exotic matter violating the null energy condition or a firewall produced by an accreting black hole ...
Terno, Daniel
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