Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hidden Momentum and Black Hole Kicks   A stationary magnetic dipole immersed in an electric field carries "hidden"
mechanical momentum. However, the fate of this momentum if the fields are
turned off is unclear. We consider a charge-and-dipole hidden momentum
configuration, and turn off the fields by collapsing a null shell onto the
system, forming a black hole. In numerical calculations we find that the black
hole receives a kick corresponding to 0.1% of the initial stored momentum. When
extrapolated to apply to purely gravitational phenomena, this efficiency
suggests a role for the hidden momentum kick mechanism in generating the binary
black hole "superkicks" observed in numerical simulations of Einstein's
equation.

16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int