Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmological implications of quantum entanglement in the multiverse   We explore the cosmological implications of quantum entanglement between two
causally disconnected universes in the multiverse. We first consider two
causally separated de Sitter spaces with a state which is initially entangled.
We derive the reduced density matrix of our universe and compute the spectrum
of vacuum fluctuations. We then consider the same system with an initially
non-entangled state. We find that scale dependent modulations may enter the
spectrum for the case of initially non-entangled state due to quantum
interference. This gives rise to the possibility that the existence of causally
disconnected universes may be experimentally tested by analyzing correlators in
detail.

36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th