Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observing Quanta on a Cosmic Scale   Our entire galaxy, like all others, originated as a fairly smooth patch of
binding energy, which in turn originated as a single quantum perturbation of
the inflaton field on a subatomic scale during inflation. The best preserved
relic of these perturbations is the anisotropy of the microwave background
radiation, which on the largest scales preserves a faithful image of the
primordial quantum fields. It is possible that close study of these
perturbations might reveal signs of discreteness caused by spacetime
quantization.

26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: eess
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th