 Infinite derivative gravity

Infinite derivative gravity is a theoretical framework in the field of quantum gravity that attempts to address some of the challenges associated with traditional theories of gravity, especially in the context of unifying gravity with quantum mechanics. The main idea behind infinite derivative gravity is to modify the Einstein-Hilbert action (the action used in General Relativity) by including terms with infinitely many derivatives of the metric field, instead of just the usual second derivatives that appear in General Relativity.