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Black holes and their shadows in gravity
Shin'ichi Nojiri, S. D. Odintsov
We investigate the radii of the photon sphere and the black hole shadow in the framework of gravity. For this purpose, we derive the field equation for the corresponding the…
Black holes, photon sphere, and cosmology in ghost-free gravity
Shin'ichi Nojiri, S. D. Odintsov
The improved version of ghost-free gravity introduced in Phys.~Lett.~B \textbf{631} (2005), 1-6 is proposed and investigated. It is demonstrated that improved ghos…
Non-metricity approach to Jackiw-Teitelboim gravity
Shin'ichi Nojiri, S. D. Odintsov
We construct 2d Jackiw-Teitelboim (JT) gravity in the framework of symmetric teleparallel gravity based on a non-metricity tensor. In symmetric teleparallel gravity, we often use t…
Improving Mimetic Gravity with Non-trivial Scalar Potential: Cosmology, Black Holes, Shadow and Photon Sphere
Shin'ichi Nojiri, Sergei D. Odintsov
It is not easy to treat the spacetime with horizon(s) in the standard mimetic gravity. The solution to this problem has been presented in Phys.~Lett.~B 830 (2022), 137140, where it…
Different aspects of entropic cosmology
Shin'ichi Nojiri, Sergei D. Odintsov, Tanmoy Paul
We give a short review of the recent developments of entropic cosmology based on two thermodynamic laws of the apparent horizon, namely the first and the second laws of thermodynam…
Can we learn from matter creation to solve the tension problem?
Emilio Elizalde, Martiros Khurshudyan, Sergei D. Odintsov
The tension problem is studied in the light of a matter creation mechanism (an effective approach to replacing dark energy), the way to define the matter creation rate bein…