Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A remark on alpha vacua for quantum field theories on de Sitter space   It is shown that the so-called $\alpha$-vacua which have been proposed as
candidates for states of free quantum fields on de Sitter space have infinitely
strong fluctuations for typical observables as averaged renormalized energy
momentum tensor.

29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat