Abstract
Title: "Poincare gauge theory of gravity:
Friedman cosmologies with even and odd parity modes"
Abstract:
We sketch the Poincare gauge theory of gravity (PG) and introduce the
most general gravitational Lagrangian quadratic in torsion and
curvature. In particular, we include all terms that are parity
odd. They mirror the parity even terms and allow new couplings to
antimatter. With Hamiltonian methods it was investigated which
Lagrangian provide a consistent theory in the sense of decent mode
propagation and having a well-defined initial value problem.
Generalizing [1], we propose a new Lagrangian [2]. This may be the
most general consistent one. We study Friedman-Lemaitre-Robertson-
Walker type cosmological solutions of the corresponding field
equations. For the Chen et al. subcase of our model, we find
numerically periodic oscillations between accelerating and
decelerating phases of the cosmos.
[1] K.F. Shie, J.M. Nester, H.J. Yo, Torsion cosmology and the
accelerating Universe, Phys. Rev. D 78, 023522 (2008). [2] BHN,
arXiv:1009.5112.