Explore the intricacies of gravitational instantons, the strong CP problem, and its associated axion solution in this 40-minute lecture delivered by Archil Kobakhidze at the Galileo Galilei Institute. Delve into advanced concepts in theoretical physics as the speaker examines the relationship between gravitational phenomena and particle physics. Gain insights into the challenges posed by the strong CP problem and discover how the axion solution offers a potential resolution. Enhance your understanding of these complex topics through expert analysis and discussion.