Reality Is Not What It Seems: The Journey to Quantum Gravity

In his latest explanatory work, Rovelli (Seven Brief Lessons on Physics), a theoretical physicist and proponent of loop quantum gravity, sets himself the difficult task of attempting to clarify for laypeople the most recent scientific theories about the nature of the universe. He begins with historical lessons, going back to philosophical questions posed in Western antiquity. Rovelli races forward through the work of Newton, Faraday, and Maxwell to get to how Einstein refined and added to the field theories of electromagnetism. One of the book’s strengths is the picture Rovelli develops of how scientists build on the work of others. But the bulk of the book focuses on evaluating the perplexing nature of space and time, which, as they are commonly understood, appear to be little more than convenient constructs. “Space is created by the interaction of individual quanta of gravity,” Rovelli writes, while “the world is made entirely made from quantum fields.” The difficulty of understanding this aside, Rovelli smoothly conveys the differences between belief and proof, and concludes with a lovely chapter on being ignorant and eager for the next discovery. Rovelli’s work is challenging, but his excitement is contagious and he delights in the possibilities of human understanding. (Feb.)