Quantum Gravity Effect in Torsion Driven Inflation and CP violation
  We have derived an effective potential for inflationary scenario from torsion and quantum gravity correction in terms of the scalar field hidden in torsion. A strict bound on the CP violating $\theta$ parameter, ${\cal O}(10^{-10})<\theta<{\cal O}(10^{-9})$ has been obtained, using {\tt Planck+WMAP9} best fit cosmological parameters. 
Sayantan Choudhury, Barun Kumar Pal, Banasri Basu, Pratul   Bandyopadhyay
hep-th astro-ph.CO gr-qc hep-ph