Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reexamination of inflation in noncommutative space-time after Planck
  results   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.

14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph