$κ$-General-Relativity I: a Non-Commutative GR Theory with the $κ$-Minkowski Spacetime as its Flat Limit

Abstract: We employ a twist deformation on infinitesimal diffeomorphisms to study a modification of General Relativity on a non-commutative spacetime extending the local $\kappa$-Minkowski spacetime. This non-commutative spacetime is present in Deformed Special Relativity (DSR) theories, where a fundamental length is relativistically incorporated into Special Relativity as an effective description of Quantum Gravity near Planckian energy scales. To avoid mathematical and physical ambiguities, such as the inability to twist-deform the Poincar\'e symmetry group such that $\kappa$-Minkowski becomes its covariant spacetime, we propose a novel approach to DSR and non-commutative theories, twisting the Dilatation-enlarged IGL(3,1) group and constructing deformed General Relativity accordingly. Physically, we interpret this as minimally modifying classical relativistic physics to accommodate quantum effects solely through spacetime uncertainties in a relativistic manner, a possibility new to DSR theories. These tools open the way to developing the dynamic sector of DSR, which would allow for predictions testable by astrophysical observations.