From Eternity to Here: The Quest for the Ultimate Theory of Time

Sean Carroll examines why time moves forward but never backward, a puzzle known as the arrow of time. He connects the everyday experience of memory and aging to the second law of thermodynamics and the concept of entropy. By analyzing the low-entropy state of the Big Bang, Carroll argues that our universe likely originated from a much larger, high-entropy multiverse. He explains how general relativity, quantum mechanics, and the birth of baby universes provide a physical framework for understanding the transition from the past to the future.

This book is intended for readers who want a rigorous physical explanation for the flow of time beyond philosophical speculation. It appeals to those interested in cosmology, particle physics, and the evolution of the early universe. Readers gain a technical understanding of how microscopic laws of physics, which are reversible, result in the macroscopic world of growth and decay. The text provides a clear mental model of how the geometry of spacetime dictates the sequence of events across billions of years.