Space-time evolution induced by spinor fields with canonical and   non-canonical kinetic terms
  We study spinor field theories as an origin to induce space-time evolution. Self-interacting spinor fields with canonical and non-canonical kinetic terms are considered in a Friedman-Robertson-Walker universe. The deceleration parameter is calculated by solving the equation of motion and the Friedman equation, simultaneously. It is shown that the spinor fields can accelerate and decelerate the universe expansion. To construct realistic models we discuss the contributions from the dynamical symmetry breaking. 
Tomohiro Inagaki, Yury Rybalov and Xinhe Meng
hep-ph gr-qc