Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Feeling de Sitter   We address the following question: To what extent can a quantum field tell if
it has been placed in de Sitter space? Our approach is to use the techniques of
non-equilibrium quantum field theory to compute the time evolution of a state
which starts off in flat space for (conformal) times $\eta<\eta_0$, and then
evolves in a de Sitter background turned on instantaneously at $\eta=\eta_0$.
We find that the answer depends on what quantities one examines. We study a
range of them, all based on two-point correlation functions, and analyze which
ones approach the standard Bunch-Davies values over time. The outcome of this
analysis suggests that the nature of the equilibration process in this system
is similar to that in more familiar systems.

19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat