5 papers
Constraints on Einstein-Maxwell dilaton-axion gravity from X-ray reflection spectroscopy
Ashutosh Tripathi, Biao Zhou, Askar B. Abdikamalov +2
Einstein-Maxwell dilaton-axion gravity is a string-inspired model arising from the low energy effective action of heterotic string theory and an important candidate as alternative…
Testing the Keplerian disk hypothesis using X-ray reflection spectroscopy
Ashutosh Tripathi, Biao Zhou, Askar B. Abdikamalov +3
The Novikov-Thorne model is the standard framework for the description of geometrically thin and optically thick accretion disks around black holes and is widely used to study the…
Shining X-rays on asymptotically safe quantum gravity
Biao Zhou, Askar B. Abdikamalov, Dimitry Ayzenberg +3
Asymptotically safe quantum gravity is a promising candidate scenario to provide a UV extension for the effective quantum field theory of Einstein's gravity. The theory has its fou…
Search for traversable wormholes in active galactic nuclei using X-ray data
Ashutosh Tripathi, Biao Zhou, Askar B. Abdikamalov +2
In a previous paper, one of us calculated iron K line profiles emitted from possible accretion disks around traversable wormholes as a first step to use X-ray reflection spectro…
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…