On reference frames in spacetime and gravitational energy in freely falling frames

Details On reference frames in spacetime and gravitational energy in freely falling frames On reference frames in spacetime and gravitational energy in freely falling frames

2007-04-07

arxiv.org/abs/0704.0986v1

Class.Quant.Grav.24:2743-2754,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages, no figures, accepted by Classical and Quantum Gravity

Scientific paper

10.1088/0264-9381/24/10/017

We consider the interpretation of tetrad fields as reference frames in spacetime. Reference frames may be characterized by an antisymmetric acceleration tensor, whose components are identified as the inertial accelerations of the frame (the translational acceleration and the frequency of rotation of the frame). This tensor is closely related to gravitoelectromagnetic field quantities. We construct the set of tetrad fields adapted to observers that are in free fall in the Schwarzschild spacetime, and show that the gravitational energy-momentum constructed out of this set of tetrad fields, in the framework of the teleparallel equivalent of general relatrivity, vanishes. This result is in agreement with the principle of equivalence, and may be taken as a condition for a viable definition of gravitational energy.

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