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

RAFAEL FERRARO AND FRANCO FIORINI

PHYSICS LETTERS B

ELSEVIER SCIENCE BV

Año: 2011 vol. 702 p. 75 - 80

0370-2693

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 a priori physical understanding. We exemplify this point by working out the vierbein (tetrad) fields for closed and open Friedmann-Robertson- Walker cosmologies. 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 a priori physical understanding. We exemplify this point by working out the vierbein (tetrad) fields for closed and open Friedmann-Robertson- Walker cosmologies. a priori physical understanding. We exemplify this point by working out the vierbein (tetrad) fields for closed and open Friedmann-Robertson- Walker cosmologies.