What is time?
Physicists Propose Radical New Approach to Understanding Time's Origin Constructor Theory Challenges Fundamental Assumptions About Temporal Reality in Universe A groundbreaking paper suggests time emerges from impossible transformations rather than being fundamental to physics August 16, 2025 In a bold challenge to one of physics' most enduring puzzles, quantum physicist David Deutsch of the University of Oxford and his colleague Chiara Marletto have published a provocative new theory that attempts to explain how time itself emerges in a universe that may be fundamentally timeless. Their work, published in a preprint on arXiv in May 2025, represents the latest development in their ambitious "constructor theory" framework—an approach that seeks to rewrite the laws of physics based on what transformations are possible or impossible rather than on the traditional language of forces and particles. The paper, titled "Constructor theory of time," a...