Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical Casimir force in the superfluid phase: effect of fluctuations   We have considered the critical Casimir force on a $^4$He film below and
above the bulk $\lambda$ point. We have explored the role of fluctuations
around the mean field theory in a perturbative manner, and have substantially
improved the mean field result of Zandi et al [Phys. Rev. E {\bf 76}, 030601(R)
(2007)]. The Casimir scaling function obtained by us approaches a universal
constant ($-\frac{\zeta(3)}{8\pi}$) for $T\lesssim 2.13~\text{K}$.

8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom