New Quantum Gravity Discovery: Gravitons Can Interact Under Specific Conditions

On March 4, 2026, researchers at the Institute for Advanced Study, Vanderbilt University, OpenAI, Harvard University, and the University of Cambridge announced an exciting breakthrough that challenges our understanding of how particles interact in quantum gravity. The study, titled "Single-minus graviton tree amplitudes are nonzero," was authored by Alfredo Guevara (Institute for Advanced Study), Alexandru Lupsasca (Vanderbilt University and OpenAI), David Skinner (University of Cambridge), Andrew Strominger (Harvard University), and Kevin Weil (OpenAI) on behalf of the research collective at OpenAI.

Understanding Scattering Amplitudes

In quantum physics, scattering amplitudes are crucial for calculating probabilities that particles interact in specific ways. These mathematical quantities simplify complex interactions into compact forms, revealing underlying structures not immediately apparent through traditional methods. Over recent decades, physicists have discovered that these amplitudes often exhibit surprising simplicity and symmetry.

Gravitons: Quantum Particles of Gravity

The new research focuses on gravitons—quantum particles associated with gravity in quantum field theory. Gravitons are the theoretical counterparts to photons (particles of light) but for gravitational forces. The study specifically examines a configuration known as single-minus amplitudes, where one particle has negative helicity while others have positive helicity.

Challenging Long-held Assumptions

The research challenges conventional wisdom that these specific configurations should vanish at the simplest level of approximation—tree level. Tree-level diagrams represent direct interactions without considering quantum loop effects, which are typically ignored in initial calculations to simplify analysis. Standard arguments suggest that such amplitudes would be zero due to conservation laws and symmetry principles.

However, using advanced computational tools like GPT-5.2 Pro, the researchers found that these single-minus graviton tree amplitudes can indeed arise under well-defined kinematic conditions. This discovery has significant implications for our understanding of quantum gravity and could lead to new insights into how gravitational forces operate at a fundamental level.