Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entanglement in curved spacetimes and cosmology   We review recent results regarding entanglement in quantum fields in
cosmological spacetimes and related phenomena in flat spacetime such as the
Unruh effect. We being with a summary of important results about field
entanglement and the mathematics of Bogoliubov transformations that is very
often used to describe it. We then discuss the Unruh-DeWitt detector model,
which is a useful model of a generic local particle detector. This detector
model has been successfully used as a tool to obtain many important results. In
this context we discuss two specific types of these detectors: a qubit and a
harmonic oscillator. The latter has recently been shown to have important
applications when one wants to probe nonperturbative physics of detectors
interacting with quantum fields. We then detail several recent advances in the
study and application of these ideas, including echoes of the early universe,
entanglement harvesting, and a nascent proposal for quantum seismology.

31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg