Properties of accretion disks in hybrid metric-Palatini f(R) gravity

Hybrid metric-Palatini f(R)-gravity is currently one of the most promising modified theories of gravity, the main task of which is to explain the accelerated expansion of the Universe. However, any theory must be tested in wide range of observational data from different objects. In this work, hybrid f(R)-gravity are tested in the strong field of black holes, namely, the energy flux and luminosity from thin accretion disks that form around such objects in this model are constructed. This study identifies possible differences from the general relativity in explaining observational data, which subsequently help to understand how relevant the theory is. One of the results of the work is that accretion disks in hybrid f(R)- gravity are dimmer than predicted by general relativity.