Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Vacuum Fluctuations in Quantum Gravity and Interferometer Arm
  Fluctuations   We propose a simple model of spacetime vacuum fluctuations motivated by
AdS/CFT, where the vacuum is described by a thermal density matrix, $\rho =
\frac{e^{-K}}{\mbox{Tr}(e^{-K})}$ with $K$ the modular Hamiltonian. In AdS/CFT,
both the expectation value of $K$ and its fluctuations $\langle \Delta K^2
\rangle$ have been calculated; both obey an area law identical to the
Bekenstein-Hawking area law of black hole mechanics: $\langle K \rangle =
\langle \Delta K^2 \rangle = \frac{A}{4 G_N}$, where $A$ is the area of an
(extremal) entangling surface. It has also been shown that $\Delta K$
gravitates in AdS, and hence generates metric fluctuations. These theoretical
results are intriguing, but it is not known how to precisely extend such ideas
about holographic quantum gravity to ordinary flat space. We take the approach
of considering whether experimental signatures in metric fluctuations could
determine properties of the vacuum of quantum gravity in flat space. In
particular, we propose a theoretical model motived by the AdS/CFT calculations
that reproduces the most important features of modular Hamiltonian
fluctuations; the model consists of a high occupation number bosonic degree of
freedom. We show that if this theory couples through ordinary gravitational
couplings to the mirrors in an interferometer with strain sensitivity similar
to what will be available for gravitational waves, vacuum fluctuations could be
observable.

6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics