Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Blue perturbation spectra from inflation   We investigate inflationary models leading to density perturbations with a
spectral index $n>1$ (``blue spectra"). These perturbation spectra may be
useful to simultaneously account for both the amount of ultra large-scale power
required to fit cosmic microwave background anisotropies, such as those
measured by COBE, and that required to give bulk motions and structures on the
$\sim 50~h^{-1}$ Mpc scale.

21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg