Non trivial frames for f(T) theories of gravity and beyond

Details Non trivial frames for f(T) theories of gravity and beyond Non trivial frames for f(T) theories of gravity and beyond

2011-03-04

arxiv.org/abs/1103.0824v3

Phys.Lett.B702:75-80,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages, 3 figures, some references added. Accepted for publication in Phys. Lett. B. Final Version

Scientific paper

10.1016/j.physletb.2011.06.049

Some conceptual issues concerning $f(T)$ theories --a family of modified gravity theories based on absolute parallelism-- are analyzed. Due to the lack of local Lorentz invariance, the autoparallel frames satisfying the field equations are evasive to an \emph{a priori} physical understanding. We exemplify this point by working out the vierbein (tetrad) fields for closed and open Friedmann-Robertson-Walker cosmologies.

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