7 research outputs found
Spacetime torsion and parity violation: a gauge invariant formulation
The possibility of parity violation through spacetime torsion has been
explored in a scenario containing fields with different spins. Taking the
Kalb-Ramond field as the source of torsion, an explicitly parity violating
gauge invariant theory has been constructed by extending the KR
field with a Chern-Simons term.Comment: 4 pages, RevTe
Parity violation in four and higher dimensional spacetime with torsion
The possibility of parity violation in a gravitational theory with torsion is
extensively explored in four and higher dimensions. In the former case,we have
listed our conclusions on when and whether parity ceases to be conserved, with
both two-and three-index antisymmetry of the torsion field. In the latter, the
bulk spacetime is assumed to have torsion, and the survival of parity-violating
terms in the four dimensional effective action is studied, using the
compactification schemes proposed by Arkani-Hamed-Dimopoulos-Dvali and
Randall-Sundrum. An interesting conclusion is that the torsion-axion duality
arising in a stringy scenario via the second rank antisymmetric Kalb-Ramond
field leads to conservation of parity in the gravity sector in any dimension.
However, parity-violating interactions do appear for spin 1/2 fermions in such
theories, which can have crucial phenomenological implications.Comment: 13 Pages, Latex, Title changed and thoroughly revised. To appear in
Eur.Phys.J.