Gravitational instanton
= Gravitational instanton
{wiki=Gravitational_instanton}
A gravitational instanton is a mathematical object that arises in the context of quantum gravity and the path integral formulation of quantum field theory. It can be understood as a non-trivial solution to the equations of motion of a gravitational system, often represented in a Euclidean signature (as opposed to Lorentzian, which is the conventional signature used in general relativity).