Hamiltonian cosmological perturbation theory with loop quantum gravity   corrections
  Cosmological perturbation equations are derived systematically in a canonical scheme based on Ashtekar variables. A comparison with the covariant derivation and various subtleties in the calculation and choice of gauges are pointed out. Nevertheless, the treatment is more systematic when correction terms of canonical quantum gravity are to be included. This is done throughout the paper for one characteristic modification expected from loop quantum gravity. 
Martin Bojowald, Hector H. Hern\'andez, Mikhail Kagan, Parampreet   Singh, and Aureliano Skirzewski