We propose a covariant and geometric framework to introduce space distances as they are used by astronomers. In particular, we extend the definition of space distances from the one used between events to non-test bodies with horizons and singularities so that the definition extends through the horizons and it matches the protocol used to measure them. The definition we propose can be used in standard general relativity although it extends directly to Weyl geometries to encompass a number of modified theories, extended theories in particular.

The generally covariant meaning of space distances

Capozziello S.;Chiappini A.;Fatibene L.
;
Orizzonte A.
2020

Abstract

We propose a covariant and geometric framework to introduce space distances as they are used by astronomers. In particular, we extend the definition of space distances from the one used between events to non-test bodies with horizons and singularities so that the definition extends through the horizons and it matches the protocol used to measure them. The definition we propose can be used in standard general relativity although it extends directly to Weyl geometries to encompass a number of modified theories, extended theories in particular.
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https://arxiv.org/abs/2011.06297
Extended theories of gravitation, observables in covariant theories.
Capozziello S.; Chiappini A.; Fatibene L.; Orizzonte A.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/1768475
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