The 4D Einstein–Gauss–Bonnet theory of gravity: a review

We review the topic of 4D Einstein-Gauss-Bonnet gravity, which has been subject considerable interest over past two years. Our begins with a general introduction to Lovelock's theorem, and Gauss-Bonnet terms in action for gravity. These areas are fundamental importance understanding modified theories inform our subsequent discussion recent attempts include effects term four space-time dimensions by re-scaling appropriate coupling parameter. discuss mathematical complexities involved implementing this idea, at constructing well-defined, self-consistent that enact it. then move on consider gravitational physics results from these theories, context black holes, cosmology, weak-field show gravity exhibits number interesting phenomena each areas.