1201.5498 (Luca Fabbri et al.)

A modified theory of gravity with torsion and its applications in
cosmology and particle physics: further developments    [PDF]

Luca Fabbri, Stefano Vignolo

In this paper we consider the most general least-order derivative theory of
gravity in which not only curvature but also torsion is explicitly present in
the Lagrangian, and where all independent fields have their own coupling
constant; we will apply this theory to the case of ELKO and Dirac fields seeing
that because torsion has a coupling constant that is still undetermined, the
ELKO and Dirac field equations are endowed with self-interactions whose
coupling constant is undetermined: we discuss different applications according
to the value of the coupling constants and the different properties that
consequently follow. We highlight that in this approach, the ELKO and Dirac
field's self-interactions depend on the coupling constant as a parameter that
may even make these non-linearities manifest at subatomic scales.

View original: http://arxiv.org/abs/1201.5498