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9 papers · 2 filters
Lee-Wick Black Holes
Cosimo Bambi, Leonardo Modesto, Yixu Wang
We derive and study an approximate static vacuum solution generated by a point-like source in a higher derivative gravitational theory with a pair of complex conjugate ghosts. The…
Constraining the Kerr parameters via X-ray reflection spectroscopy
M. Ghasemi-Nodehi, Cosimo Bambi
In a recent paper [Ghasemi-Nodehi & Bambi, EPJC 76 (2016) 290], we have proposed a new parametrization for testing the Kerr nature of astrophysical black hole candidates. In the pr…
Linking loop quantum gravity quantization ambiguities with phenomenology
Suddhasattwa Brahma, Michele Ronco, Giovanni Amelino-Camelia +1
Fundamental quantum gravity theories are known to be notoriously difficult to extract viable testable predictions out of. In this paper, we aim to incorporate putative quantum corr…
Iron K line of boson stars
Zheng Cao, Alejandro Cardenas-Avendano, Menglei Zhou +3
The present paper is a sequel to our previous work [Y. Ni et al., JCAP 1607, 049 (2016)] in which we studied the iron K line expected in the reflection spectrum of Kerr black ho…
Black hole solutions in functional extensions of Born-Infeld gravity
Cosimo Bambi, D. Rubiera-Garcia, Yixu Wang
We consider electrovacuum black hole spacetimes in classical extensions of Eddington-inspired Born-Infeld gravity. By rewriting Born-Infeld action as the square root of the determi…
Rotating systems, universal features in dragging and anti-dragging effects, and bounds onto angular momentum
Janusz Karkowski, Patryk Mach, Edward Malec +2
We consider stationary, axially symmetric toroids rotating around spinless black holes, assuming the general-relativistic Keplerian rotation law, in the first post-Newtonian approx…