quantum gravity
Lawrence Krauss – Why is Quantum Gravity So Significant?
Quantum theory explains how particles and fields work. General relativity, discovered by Einstein, explains how gravity generates the structure of the universe. But the two great theories of physics and cosmology are not compatible. But this is impossible because both describe reality. Only a solution to quantum gravity can solve the huge problem.
Lawrence Maxwell Krauss is a Canadian-American theoretical physicist and cosmologist who is a Foundation Professor of the School of Earth and Space Exploration, and director of the Origins Project at Arizona State University