Quantum Bending of Light

Light traveling close to an object gets deflected from its path because of the pull of gravity. For a massive object like the Sun, this deflection is measurable: The best measurements to date show that the gravitational pull of the Sun deflects light 0.00049º—in line with the predictions of general relativity. Now Niels Bjerrum-Bohr, at the Niels Bohr Institute in Denmark, and colleagues have calculated how this deflection would be altered when gravity is described as a quantum field.