Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Correlations of Quantum Fields on Robertson-Walker Spacetimes   It is a well known fact that quantum fields on Minkowski spacetime are
correlated for each pair of spacetime regions. In Robertson-Walker spacetimes
there are spacelike separated regions with disjoint past horizons but the
absence of correlations in that case was never proved. We derive in this paper
formulae for correlations of quantum fields on Robertson-Walker spacetimes.
Such correlations could have reasonably influenced the formation of structure
in the early universe. We use methods of algebraic and constructive quantum
field theory.

34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th