Wednesday, April 17, 2013

1304.4358 (Nan Li et al.)

Reexamination of inflation in noncommutative space-time after Planck results    [PDF]

Nan Li, Xin Zhang
An inflationary model in the framework of noncommutative space-time may generate a nontrivial running of the scalar spectral index, but usually induces a large tensor-to-scalar ratio simultaneously. With the latest observational data from the Planck mission, we reexamine the inflationary scenarios in a noncommutative space-time. We find that either the running of the spectral index is tiny compared with the recent observational result, or the tensor-to-scalar ratio is too large to allow a sufficient number of $e$-folds. As examples, we show that the chaotic and power-law inflation models with the noncommutative effects are not favored by the current Planck data.
View original: http://arxiv.org/abs/1304.4358

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