If you're looking for books on General Relativity that provide an accessible introduction without requiring extensive mathematical background, here are a few recommendations:
"A Brief History of Time" by Stephen Hawking: Although this book is not solely focused on General Relativity, it does cover the subject in a way that is understandable to non-experts. Hawking provides a concise overview of the key concepts and implications of General Relativity.
"The Elegant Universe" by Brian Greene: This book explores various aspects of modern physics, including General Relativity, in a captivating and comprehensible manner. While some mathematical concepts are introduced, Greene emphasizes conceptual understanding, making it accessible to a wide readership.
"Introducing Einstein's Relativity" by Ray d'Inverno: This introductory book explains the principles of General Relativity using clear and non-technical language. It covers topics such as the curvature of spacetime, black holes, and the expanding universe, providing a solid foundation without delving into complex mathematics.
"Einstein's Universe: The Layperson's Guide" by Nigel Calder: Calder's book offers a reader-friendly introduction to the theory of General Relativity. It presents the concepts, historical background, and consequences of the theory in an engaging manner, without excessive mathematical detail.
"Gravity: An Introduction to Einstein's General Relativity" by James B. Hartle: While this book does introduce some mathematical concepts, it focuses on developing a conceptual understanding of General Relativity rather than extensive mathematical formalism. It covers key topics, including spacetime curvature, gravitational waves, and the expanding universe.
These books provide a starting point for grasping the fundamental ideas and implications of General Relativity without requiring extensive mathematical background. However, keep in mind that General Relativity is a complex theory, and a deeper understanding often requires a more mathematical approach.