Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phantom Thermodynamics Revisited   Although generalized Chaplygin phantom models do not show any big rip
singularities, we investigated k-essence models together with noncanonical
kinetic energy for which there might be a big rip future singularity in the
phantom region. We present our results by finely tuning the parameter ($\beta$)
which is closely related to the canonical kinetic term in $k$-essence
formalism. The scale factor $a(t)$ could be negative and decreasing within a
specific range of $\beta$ during the initial evolutional period. There will be
no singularity for the scale factor for all times once $\beta$ is carefully
selected.

30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ