This book investigates the limitations of Einstein's General Relativity and explores alternative theories of gravity. It delves into modifications of gravity that aim to explain cosmological observations such as dark energy and dark matter, and examines theories that extend or replace Einstein's framework. The work is intended for researchers and graduate students in theoretical physics and cosmology.

The book is recognized as a comprehensive overview of modified gravity theories, providing a valuable resource for researchers in theoretical physics and cosmology. Its detailed exploration of alternative frameworks to General Relativity is noted for its depth and breadth. The work is considered a significant contribution to the field, offering insights into current challenges and future directions in understanding gravity.