Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: More about the Tolman-Oppenheimer-Volkoff equations for the generalized
  Chaplygin gas   We investigate the Tolman-Oppenheimer-Volkoff equations for the generalized
Chaplygin gas with the aim of extending the findings of V. Gorini, U.
Moschella, A. Y. Kamenshchik, V. Pasquier, and A. A. Starobinsky [Phys. Rev. D
{\bf 78}, 064064 (2008)]. We study both the standard case, where we reproduce
some previous results, and the phantom case. In the phantom case we show that
even a superluminal group velocity arising for $\alpha > 1$ cannot prevent the
divergence of the pressure at a finite radial distance. Finally, we investigate
how a modification of the generalized Chaplygin gas equation of state, required
by causality arguments at densities very close to $\Lambda$, affects the
results found so far.

21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph