Metric theories of gravity are studied, beginning with a general action that is quadratic in
curvature and allows arbitrary inverse powers of the dʼAlembertian operator, resulting in …

Several recent studies have shown that very wide binary stars can potentially provide an
interesting test for modified-gravity theories which attempt to emulate dark matter; these …

In this work we investigate the existence of relativistic models for dark matter in the context of
bimetric gravity, used here to reproduce the modified Newtonian dynamics (MOND) at …

Abstract The Schwarzschild–de Sitter solution in the Einstein theory with a positive
cosmological constant becomes an exact solution to the de Rham–Gabadadze–Tolley …

Massive gravity theories have been developed as viable IR modifications of gravity
motivated by dark energy and the problem of the cosmological constant. On the other hand …

We consider a class of nonlocal, pure-metric modified gravity models which were developed
to reproduce the Tully-Fisher relation without dark matter and without changing the amount …

In any physical system, when we move from short to large scales, new spacetime
symmetries emerge which help us to simplify the dynamics of the system. In this letter we …

Nonlocal models of cosmology might derive from graviton loop corrections to the effective
field equations from the epoch of primordial inflation. Although the Schwinger-Keldysh …

This paper proposes a theoretical study that investigates quantum effects on the gravity of
black holes. This study utilizes a gravitational model that incorporates quantum mechanics …

I discuss relativistic extensions of MOND in which the metric couples normally to matter. I
argue that MOND might be a residual effect from the vacuum polarization of infrared …