Dong-il Hwang, Soo A Kim, Bum-Hoon Lee, Hanno Sahlmann, Dong-han Yeom
The no-boundary wave function of quantum gravity tends to assign only very small probability to long periods of inflation. This leads to tension with observations. We study the no-boundary proposal in the context of multi-field inflation to see whether the number of fields changes the situation. For a simple model, we find that indeed the no-boundary wave function can give higher probability for sufficient inflation, but the number of fields involved has to be very high.
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http://arxiv.org/abs/1207.0359
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