Explore the gravitational index of the heterotic string in this 44-minute conference talk by Sameer Murthy from King's College London. Delivered as part of the Spacetime and String Theory conference at the Kavli Institute for Theoretical Physics, delve into advanced topics in string theory and its implications for understanding spacetime. Examine the connections between quantum information, string compactification, and holographic dualities beyond anti-de Sitter space. Investigate recent progress in non-perturbative string theory, stringy constraints on effective field theory, and the relationships between gravitational path integrals, higher topologies, and entanglement across energy scales. Gain insights into cutting-edge research bridging the divide between infrared and ultraviolet perspectives in string theory.