“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 13660
School of Particles and Accelerator
  Title:   R2logR quantum corrections and the inflationary observables
1.  Ido Ben-Dayan
2.  Shenglin Jing
3.  Mahdi Torabian
4.  Alexander Westphal
5.  Lucila Zarate
  Status:   Submitted
  Year:  2014
  Supported by:  IPM
We study a model of inflation with terms quadratic and logarithmic in the Ricci scalar, where the gravitational action is f(R)=R+aR2+bR2lnR. These terms are expected to arise from one loop corrections involving matter fields in curved space-time. The spectral index ns and the tensor to scalar ratio yield 10-4<r<0.03 and 0.94<ns<0.99. i.e. r is an order of magnitude bigger or smaller than the original Starobinsky model which predicted r=10-3. Further enhancement of r gives a scale invariant ns=1 or higher. Other inflationary observables are dns/dlnk>-5.2*10-4,u<2.1*10-8,y<2.6*10-9. Despite the enhancement in r, if the recent BICEP2 measurement stands, this model is disfavoured.

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