Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Massive neutral particles on heterotic string theory   The motion of massive particles in the background of a charged black hole in
heterotic string theory, which is characterized by a parameter $\alpha$, is
studied in detail in this paper. Since it is possible to write this space-time
in the Einstein frame, we perform a quantitative analysis of the time-like
geodesics by means of the standard Lagrange procedure. Thus, we obtain and
solve a set of differential equations and then we describe the orbits in terms
of the elliptic $\wp$-Weierstra{\ss} function. Also, by making an elementary
derivation developed by Cornbleet (Am. J. Phys. \textbf{61} 7, (1993) 650 -
651) we obtain the correction to the angle of advance of perihelion to first
order in $\alpha$, and thus, by comparing with Mercury's data we give an
estimation for the value of this parameter, which yields an {\it heterotic
solar charge} $Q_{\odot}\simeq 0.728\,[\textrm{Km}]= 0.493\, M_{\odot}$.
Therefore, in addition to the study on null geodesics performed by Fernando
(Phys. Rev. D {\bf 85}, (2012) 024033), this work completes the geodesic
structure for this class of space-time.

19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph