Results 111 to 120 of about 55,540 (200)

The weak cosmic censorship conjecture in hairy Kerr black holes

European Physical Journal C: Particles and Fields
The weak cosmic censorship conjecture, since its proposal, has always been a controversial hypothesis, but its significance in astrophysics is undeniable.
Lai Zhao, Meirong Tang, Zhaoyi Xu
doaj   +1 more source

Tidal Forces in Majumdar-Papapetrou Spacetimes

Universe
Tidal disruption events occur when astrophysical objects are destroyed by black holes due to strong tidal force effects. Tidal forces have been studied in a variety of black hole spacetimes, including Reissner-Nordström and Kerr spacetimes.
Eduardo Albacete, Maurício Richartz
doaj   +1 more source

Geodesic equations in the static and rotating dilaton black holes: Analytical solutions and applications

, 2016
In this paper, we consider the timelike and null geodesics around the static [GMGHS (Gibbons, Maeda, Garfinkle, Horowitz and Strominger), magnetically charged GMGHS, electrically charged GMGHS] and the rotating (Kerr-Sen dilaton-axion) dilaton black ...
Saffari, Reza, Sahami, Ehsan, Soroushfar, Saheb   +2 more
core   +1 more source

Hints of Spin-magnitude Correlations and a Rapidly Spinning Subpopulation of Binary Black Holes

The Astrophysical Journal
The complex astrophysical processes leading to the formation of binary black holes and their eventual merger are imprinted on the spins of the individual black holes.
Asad Hussain, Maximiliano Isi, Aaron Zimmerman   +2 more
doaj   +1 more source

Astrophysics of stellar black holes

Gravitational Waves and Cosmology, 2018
On September 14 2015, the LIGO interferometers captured a gravitational wave (GW) signal from two merging black holes (BHs), opening the era of GW astrophysics. Five BH mergers have been reported so far, three of them involving massive BHs ($\gtrsim{}30$ M$_\odot$).
openaire   +3 more sources

QPOs analyses and circular orbits of charged particles around magnetized black holes in Bertotti–Robinson geometry

European Physical Journal C: Particles and Fields
Analyses 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, Javlon Rayimbaev, Bekir Can Lütfüolu, Ahmadjon Abdujabbarov, Sabirov Sardor, Inomjon Ibragimov, Murodbek Vapayev, Bahrom Kuyliev   +7 more
doaj   +1 more source

Non-trivial saddles in microscopic description of black holes

Journal of High Energy Physics
Non-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
doaj   +1 more source

The properties of primordially-seeded black holes and their hosts in the first billion years: implications for JWST

Astronomy & Astrophysics
Aims. 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
doaj   +1 more source

Constraints on the Sen black hole mass and charge from quasi-periodic oscillations

European Physical Journal C: Particles and Fields
We 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
doaj   +1 more source

A comparative artificial neural networks for Schwarzschild black hole (SBH) radius

Physics Open
It 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, Wasfi Shatanawi, Weam G. Alharbi   +2 more
doaj   +1 more source