Beyond Einstein's Gravity is a graduate level introduction to extended theories of gravity and
cosmology, including variational principles, the weak-field limit, gravitational waves …

We review nonsingular static, spherically symmetric solutions of general relativity with
minimally coupled scalar fields. Considered are wormholes and regular black holes (BHs) …

We study self-gravitating, static, spherically symmetric phantom scalar fields with arbitrary
potentials (favored by cosmological observations) and single out 16 classes of possible …

Entropy | Free Full-Text | Black Hole Entropy in Scalar-Tensor and ƒ(R) Gravity: An
Overview Next Article in Journal Semantic Networks: Structure and Dynamics Next Article in …

The condition R= 0, where R is the four-dimensional scalar curvature, is used for obtaining a
large class (with an arbitrary function of r) of static, spherically symmetric Lorentzian …

At the beginning of the 20th century, only two physical fields were known, the
electromagnetic and gravitational ones. Einstein's theory of special relativity (SR), created in …

Solutions-generating methods based on field redefinitions, such as conformal mapping, play
an important role in investigating exact solutions in modified gravity. In this work, we explore …

We give a comparative description of different types of regular static, spherically symmetric
black holes (BHs) and discuss in more detail their particular type, which we suggest to call …

We use the general solution to the trace of the 4-dimensional Einstein equations for static,
spherically symmetric configurations as a basis for finding a general class of black hole (BH) …

We study the stability of static, spherically symmetric solutions to the Einstein equations with
a scalar field as the source. We describe a general methodology of studying small radial …