Archil Kobakhidze: "Gravitational instantons, strong CP problem and its companion axion solution"

Whole-channel inclusion: Galileo Galilei Institute (GGI) is an honest teaching channel (title sample + 3 transcripts read: All three transcripts show genuine advanced physics research talks/lectures with structured technical explanation, consistent with the institute's teaching focus.); this title passed a strict title check (sonnet) after a labelling pass.