Results 11 to 20 of about 1,346 (168)
Tidal forces in dirty black hole spacetimes
European Physical Journal C: Particles and Fields, 2022 Black holes can be inserted in very rich astrophysical environments, such as accretion disks. Although isolated black holes are simple objects in general relativity, their accretion disks may significantly enrich the field configurations of their ...
Haroldo C. D. Lima Junior +3 more
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Gravitational lensing by a Horndeski black hole
European Physical Journal C: Particles and Fields, 2017 In this article we study gravitational lensing by non-rotating and asymptotically flat black holes in Horndeski theory. By adopting the strong deflection limit, we calculate the deflection angle, from which we obtain the positions and the magnifications ...
Javier Badía, Ernesto F. Eiroa
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Rotating black holes in Horndeski gravity: thermodynamic and gravitational lensing
European Physical Journal C: Particles and Fields, 2022 The lack of rotating black holes, typically found in nature, hinders testing modified gravity from astrophysical observations. We present the axially symmetric counterpart of an existing spherical hairy black hole in Horndeski gravity having additional ...
Rahul Kumar Walia +2 more
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Electric Currents along Astrophysical Jets
Galaxies, 2017 Astrophysical black holes and their surrounding accretion disks are believed to be threaded by grand design helical magnetic fields. There is strong theoretical evidence that the main driver of their winds and jets is the Lorentz force generated by these
Ioannis Contopoulos
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European Physical Journal C: Particles and Fields, 2021 We consider the equation of motion of a charged particle or a charged compact object in curved space-time, under the reaction of electromagnetic radiation and also consider a physical situation such that the charged particle or compact object emits ...
Arnab Sarkar, Amna Ali, Salah Nasri
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Testing Ghasemi-Nodehi–Bambi spacetime with continuum-fitting method
European Physical Journal C: Particles and Fields, 2020 The continuum-fitting method is the analysis of the thermal spectrum of the geometrically thin and optically thick accretion disk around stellar-mass black holes.
M. Ghasemi-Nodehi
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Approaching the Black Hole by Numerical Simulations
Universe, 2019 Black holes represent extreme conditions of physical laws. Predicted about a century ago, they are now accepted as astrophysical reality by most of the scientific community.
Christian Fendt
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The Astrophysical JournalThe discovery of quasars and their supermassive black holes (SMBHs) over 10 ^9 ${M}_{{\rm{\odot }}}$ merely hundreds of millions of years after the Big Bang generates tension with the idea of Eddington-limited accretion and pressures the community into ...
Jackson Frangos +4 more
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Universe, 2018 Classic black hole mechanics and thermodynamics are formulated for stationary black holes with event horizons. Alternative theories of gravity of interest for cosmology contain a built-in time-dependent cosmological “constant” and black holes
Valerio Faraoni
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Impairments on the Construction of a Cosmic Neutrino Detector in a Romanian Salt Mine
Natural Sciences, EarlyView.The modulus of the transfer function of an antenna when boreholed in salt. With red are represented results from the Targu Ocna salt mine and with black‐from Slanic salt mine ABSTRACT Indirect cosmic neutrino detectors utilize dense media to enhance the likelihood of neutrino interactions within the detection volume.
A. M. Badescu
wiley +1 more source