Conserved quantities in STEGR and applications

We derive conservation laws in Symmetric Teleparallel Equivalent of General Relativity (STEGR) with direct application of Noether's theorem. This approach allows us to construct covariant conserved currents, corresponding superpotentials and invariant charges. A necessary component of our constructions is the concept of turning off gravity, introduced in the framework of STEGR to define the flat and torsionless connection. By calculating currents, one can obtain local characteristics of gravitational field like energy density. Surface integration of superpotentials gives charges which correspond to global quantities of the system like mass, momentum, etc. To test our results for the obtained currents and superpotentials, we calculate the energy density measured by freely falling observer in the simple solutions (Friedman universe, Schwartzchild black hole) and total mass of the Schwartzchild black hole. We find ambiguities in obtaining the connection, which explicitly affect the values of conserved quantities, and discuss possible solutions to this problem.

Automated summary

We derive conservation laws in Symmetric Teleparallel Equivalent of General Relativity (STEGR) by directly applying Noether's theorem. This approach allows us to construct covariant conserved currents, corresponding superpotentials, and invariant charges. We introduce the concept of turning off gravity to define the flat and torsionless connection in STEGR, which is a necessary component in our constructions. We calculate the energy density and total mass in simple solutions to test our results and discuss possible solutions for the ambiguities in obtaining the connection that affect the values of conserved quantities.