Projects like LIGO are searching for hypothetical waves caused by this force.
Projects like LIGO are searching for hypothetical waves caused by this force. The Standard Model predicts that this force is carried by a massless, spin-2 particle, though it has yet to be observed. Unlike the other fundamental forces, this one cannot be renormalized in quantum field theory, leading to alternate theories of its operation like string theory. The principle of equivalence says that the effects of this force are indistinguishable from acceleration. For 10 points, name this force described by general relativity, the attraction that occurs between any two massive objects.
Projects like LIGO are searching for hypothetical waves caused by this force.
{gravity}