Modern physics rests on two major pillars: quantum mechanics and general relativity, radically transforming our understanding of the Universe. Despite these advances, unifying these two theories remains a major challenge. In this book, we undertake an innovative exploration, based on the bold idea that the time it takes for an electron to absorb a photon could reveal profound links with the deformation of space-time in a black hole. This hypothesis opens up new perspectives for understanding quantum and gravitational phenomena, offering a possible path towards a unified theory integrating quantum mechanics and general relativity.