Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Can Modified Gravity (MOG) explain the speeding Bullet (Cluster)?   We apply our scalar-tensor-vector (STVG) modified gravity theory (MOG) to
calculate the infall velocities of the two clusters constituting the Bullet
Cluster 1E0657-06. In the absence of an applicable two-body solution to the MOG
field equations, we adopt an approximate acceleration formula based on the
spherically symmetric, static, vacuum solution of the theory in the presence of
a point source. We find that this formula predicts an infall velocity of the
two clusters that is consistent with estimates based on hydrodynamic
simulations.

34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess