152 citations · 993 across the 31 of their papers we have counts for
17 papers · 1 filter
Testing regular black holes with X-ray and GW data
Shafqat Riaz, Swarnim Shashank, Rittick Roy +5
The presence of spacetime singularities in physically relevant solutions of the Einstein Equations is normally interpreted as a symptom of the breakdown of classical general relati…
X-ray reflection spectroscopy with Kaluza-Klein black holes
Jiachen Zhu, Askar B. Abdikamalov, Dimitry Ayzenberg +6
Kaluza-Klein theory is a popular alternative theory of gravity, with both non-rotating and rotating black hole solutions known. This allows for the possibility that the theory coul…
Singularity-free black holes in conformal gravity: new observational constraints
Menglei Zhou, Askar B. Abdikamalov, Dimitry Ayzenberg +4
We consider the family of singularity-free rotating black hole solutions in Einstein's conformal gravity found in Bambi, Modesto & Rachwal (2017) and we constrain the value of the…
Testing general relativity with the stellar-mass black hole in LMC X-1 using the continuum-fitting method
Ashutosh Tripathi, Menglei Zhou, Askar B. Abdikamalov +6
The iron line and the continuum-fitting methods are currently the two leading techniques for measuring black hole spins with electromagnetic radiation. They can be naturally extend…
Modeling uncertainties in X-ray reflection spectroscopy measurements I: Impact of higher order disk images
Menglei Zhou, Dimitry Ayzenberg, Cosimo Bambi +1
There are many simplifications in current relativistic reflection models and this introduces systematic uncertainties in the measurement of the properties of the source. In this pa…
Relativistic reflection spectra of super-spinning black holes
Biao Zhou, Ashutosh Tripathi, Askar B. Abdikamalov +4
We construct a relativistic reflection model in a non-Kerr spacetime in which, depending on the value of the deformation parameter of the metric, there are black hole solutions wit…
XSPEC model for testing the Kerr black hole hypothesis using the continuum-fitting method
Menglei Zhou, Askar B. Abdikamalov, Dimitry Ayzenberg +3
We present NKBB, an XSPEC model for the thermal spectrum of thin accretion disks in parametric black hole spacetimes. We employ the Novikov-Thorne model for the description of the…
Iron line spectroscopy of black holes in asymptotically safe gravity
Yuexin Zhang, Menglei Zhou, Cosimo Bambi
We study the iron line shape expected in the reflection spectrum of accretion disks around black holes in asymptotically safe gravity. We compare the results of our simulations wit…
Testing conformal gravity with the supermassive black hole in 1H0707-495
Menglei Zhou, Zheng Cao, Askar Abdikamalov +4
Recently, two of us have found a family of singularity-free rotating black hole solutions in Einstein's conformal gravity. These spacetimes are characterized by three parameters: t…
Distinguishing black holes and naked singularities with iron line spectroscopy
Honghui Liu, Menglei Zhou, Cosimo Bambi
It is commonly thought that the final product of gravitational collapse is a black hole. Nevertheless, theoretical studies have not yet provided a final answer to the question whet…
Testing Einstein-dilaton-Gauss-Bonnet gravity from the reflection spectrum of accreting black holes
Hao Zhang, Menglei Zhou, Cosimo Bambi +3
Einstein-dilaton-Gauss-Bonnet gravity is a theoretically well-motivated alternative theory of gravity emerging as a low-energy 4-dimensional model from heterotic string theory. Its…
Iron K line of Kerr black holes with Proca hair
Menglei Zhou, Cosimo Bambi, Carlos A. R. Herdeiro +1
We continue our study on the capabilities of present and future X-ray missions to test the nature of astrophysical black hole candidates via X-ray reflection spectroscopy and disti…
Iron K line of Proca stars
Tianling Shen, Menglei Zhou, Cosimo Bambi +2
X-ray reflection spectroscopy can be a powerful tool to test the nature of astrophysical black holes. Extending previous work on Kerr black holes with scalar hair [1] and on boson…
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…
Iron K line of Kerr black holes with scalar hair
Yueying Ni, Menglei Zhou, Alejandro Cardenas-Avendano +3
Recently, a family of hairy black holes in 4-dimensional Einstein gravity minimally coupled to a complex, massive scalar field was discovered~\cite{hbh}. Besides the mass and s…
Testing the Kerr black hole hypothesis using X-ray reflection spectroscopy
Cosimo Bambi, Alejandro Cardenas-Avendano, Thomas Dauser +2
We present the first X-ray reflection model for testing the assumption that the metric of astrophysical black holes is described by the Kerr solution. We employ the formalism of th…
Search for astrophysical rotating Ellis wormholes with X-ray reflection spectroscopy
Menglei Zhou, Alejandro Cardenas-Avendano, Cosimo Bambi +2
Recently, two of us have found numerically rotating Ellis wormholes as solutions of 4-dimensional Einstein gravity coupled to a phantom field. In this paper, we investigate possibl…