Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Casimir spring and dilution in macroscopic cavity optomechanics   The Casimir force was predicted in 1948 as a force arising between
macroscopic bodies from the zero-point energy. At finite temperatures it has
been shown that a thermal Casimir force exists due to thermal rather than
zero-point energy and there are a growing number of experiments that
characterise the effect at a range of temperatures and distances. Additionally,
in the rapidly evolving field of cavity optomechanics there is an endeavor to
manipulate phonons and enhance coherence. We demonstrate a new way to achieve
this through the first observation of Casimir spring and dilution in
macroscopic optomechanics, by coupling a metallic SiN membrane to a photonic
re-entrant cavity. The attraction of the spatially-localised Casimir spring
mimics a non-contacting boundary condition giving rise to increased strain and
acoustic coherence through dissipation dilution. This work invents a new way to
manipulate phonons via thermal photons leading to ``in situ'' reconfigurable
mechanical states, to reduce loss mechanisms and to create new types of
acoustic non-linearity -- all at room temperature.

7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph