Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Boson stars in $f(T)$ extended theory of gravity   Spherically symmetric configurations of the non-interacting massive complex
scalar field, representing non-rotating boson stars, are considered within the
framework of the modified torsion based $f(T)$ gravity, with $f(T) = T + \alpha
\, T^2/2$. We find that with sufficiently large negative value of $\alpha$ the
mass of the boson stars can be made arbitrarily large. This is in contrast to
General Relativity where an upper bound, $M_{max} \sim M_{Planck}^2/m$, to the
mass of the boson stars built from the non-interacting scalar field exists and
where the masses of boson stars in the astrophysical regime can be obtained
only with the introduction of the scalar field self-interaction. With
sufficiently large negative $\alpha$ we also find negative gravitational
binding energy for all masses, which can be seen as an indication of the
stability of such configurations. In its positive regime, $\alpha$ can not be
made arbitrarily large as a phase transition in the stress--energy components
of the $f(T)$-fluid develops. This phenomenon has already been reported to
occur in polytropic stars constructed within the $f(T)$ gravity theory.

1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph