Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Chaplygin gas as a model for modified teleparallel gravity?   This paper explores the possibility of treating the exotic Chaplygin-gas (CG)
fluid model as some manifestation of an $f(T)$ gravitation. To this end, we use
the different cosmological CG equations of state, compare them with the
equation of state for the modified teleparallel gravity and reconstruct the
corresponding Lagrangian densities. We then explicitly derive the equation of
state parameter of the torsion fluid $w_T$ and study its evolution for
vacuum-torsion, radiation-torsion, dust-torsion, stiff fluid torsion, and
radiation-dust-torsion multi-fluid systems. The obtained Lagrangians have, in
general, matter dependence due to the matter-torsion coupling appearing in the
energy density and pressure terms of the modified teleparallel gravity theory.
For the simplest CG models, however, it is possible to reconstruct $f(T)$
Lagrangians that depend explicitly on the torsion scalar $T$ only. The
preliminary results show that, in addition to providing Chaplygin-gas-like
solutions to the modified teleparallel gravitation, which naturally behave like
dark matter and dark energy at early and late times respectively, the technique
can be used to overcome some of the challenges attributed to the CG
cosmological alternative.

27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat