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

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.

preprint2011arXivOpen access
Rafael FerraroFranco Fiorini
gr-qchep-th
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Rafael FerraroFranco Fiorini

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