Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Casimir Self-Entropy of a Spherical Electromagnetic $\delta$-Function
  Shell   In this paper we continue our program of computing Casimir self-entropies of
idealized electrical bodies. Here we consider an electromagnetic
$\delta$-function sphere ("semitransparent sphere") whose electric
susceptibility has a transverse polarization with arbitrary strength.
Dispersion is incorporated by a plasma-like model. In the strong coupling
limit, a perfectly conducting spherical shell is realized. We compute the
entropy for both low and high temperatures. The TE self-entropy is negative as
expected, but the TM self-entropy requires ultraviolet and infrared
subtractions, and, surprisingly, is only positive for sufficiently strong
coupling. Results are robust under different regularization schemes.

20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph