Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectator field models in light of spectral index after Planck   We revisit spectator field models including curvaton and modulated reheating
scenarios, specifically focusing on their viability in the new Planck era,
based on the derived expression for the spectral index in general spectator
field models. Importantly, the recent Planck observations give strong
preference to a red-tilted power spectrum, while the spectator field models
tend to predict a scale-invariant one. This implies that, during inflation,
either (i) the Hubble parameter varies significantly as in chaotic inflation,
or (ii) a scalar potential for the spectator field has a relatively large
negative curvature. Combined with the tight constraint on the non-Gaussianity,
the Planck data provides us with rich implications for various spectator field
models.

22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat