New classes of modified teleparallel gravity models

Abstract

New classes of modified teleparallel theories of gravity are introduced. The action of this theory is constructed to be a function of the irreducible parts of torsion $f(T_{\mathrm{ax}},T_{\mathrm{ten}},T_{\mathrm{vec}})$, where $T_{\mathrm{ax}},T_{\mathrm{ten}}$ and $T_{\mathrm{vec}}$ are squares of the axial, tensor and vector components of torsion, respectively. This is the most general (well-motivated) second order teleparallel theory of gravity that can be constructed from the torsion tensor. Different particular second order theories can be recovered from this theory such as new general relativity, conformal teleparallel gravity or $f(T)$ gravity. Additionally, the boundary term $B$ which connects the Ricci scalar with the torsion scalar via $R=-T+B$ can also be incorporated into the action. By performing a conformal transformation, it is shown that the two unique theories which have an Einstein frame are either the teleparallel equivalent of general relativity or $f(-T+B)=f(R)$ gravity, as expected.

v2: 10 pages, accepted for publication in PLB; for a detailed derivation of the field equations see Appendix A in v1

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