The book begins with elementary considerations—even discussing units of some fundamental constants, namely Newton's gravitational constant, the speed of light in vacuum , and the reduced Planck constant—before exploring the relevance of relativity, curved spacetime, and differential geometry.[4] Most standard topics in general relativity are covered.[3] Towards the end of the book, Zee covers a number of advanced topics, including those not yet well established, such as conformal transformations, topological field theory, and the Kaluza-Klein theory.[3][4] Zee emphasizes the use of action and symmetry.[4]
Michael Berg wrote in his review for the Mathematical Association of America that like its predecessor, Einstein Gravity in a Nutshell is rather appealing, even though it not mathematically rigorous. Berg found Zee's "chatty" style to be insightful and he enjoyed the historical anecdotes throughout the book.[2]
Luboš Motl opined in his blog The Reference Frame that this is an entertaining and helpful book for readers at various levels, including gifted students in high school, comparing it to The Feynman Lectures on Physics. According to Motl, Zee's text dwelled deeper into general relativity than most other introductory texts and offers many clever analogies and exercises. Einstein Gravity in a Nutshell more sophisticated than Gravity (2002) by James Hartle but less so than Spacetime and Geometry (2003) by Sean Michael Carroll.[4]
Thomas Peters of the University of Zurich praised the Einstein Gravity in a Nutshell as a unique and transparent presentation of the materials, beautifully typeset and richly illustrated. He commended its practical introduction to differential geometry that avoided unnecessary mathematical complications, building upon coordinate transformations and the classical differential geometry of surfaces and curves as an illustration. He noted that the book incorporated all the standard topics of general relativity, with the notable exception of gravitational lensing, as well as some advanced ones, such as Penrose diagrams.[3]
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