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Equilibrium of slowly rotating polytropes in modified theories of gravity
Shaswata Chowdhury, Pritam Banerjee, Aneta Wojnar
A general formalism to find the density profile of a slowly rotating stellar object in modified gravity is presented. We derive a generic Lane-Emden equation and its analytical sol…
Metric-affine effects in crystallization processes of white dwarfs
Surajit Kalita, Lupamudra Sarmah, Aneta Wojnar
We analyze the effects of modified gravity on specific heats of electrons and ions, Debye temperature, crystallization process, and cooling mechanism in white dwarfs. We derive the…
Cooling Process of White Dwarf Stars in Palatini Gravity
Surajit Kalita, Lupamudra Sarmah, Aneta Wojnar
A simple cooling model of white dwarf stars is re-analyzed in Palatini gravity. Modified gravity affects the white dwarf structures and consequently their ages. We find that…
Fermi gas and modified gravity
Aneta Wojnar
We derive the equations of state of Fermi gas by maximizing the Fermi-Dirac entropy in modified gravity in relativistic and non-relativistic case. It will be demonstrated that the…
Early evolution of fully convective stars in scalar-tensor gravity
Débora Aguiar Gomes, Aneta Wojnar
In this work, the early evolution of low-mass fully convective stars is studied in the context of DHOST (degenerate higher order scalar-tensor) theories of gravity. Although it is…
Cooling process of substellar objects in scalar-tensor gravity
Aleksander Kozak, Kärt Soieva, Aneta Wojnar
Cooling processes of brown dwarf stars and giant planets are studied in the framework of DHOST theories. We confirm the previous results in the field that the effect of modified gr…
Normalized additional velocity distribution: testing the radial profile of dark matter halos and MOND
Davi C. Rodrigues, Alejandro Hernandez-Arboleda, Aneta Wojnar
We propose a complementary and fast approach to study galaxy rotation curves directly from the sample data, instead of individual fits. With this approach, some relevant tests can…
Giant planet formation in Palatini gravity
Aneta Wojnar
Some parts of the accretion model of the jovian planets' formation are studied in the context of Palatini gravity. We mainly focus on the critical core mass, that is, a mass for wh…