Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The origin of pulsar velocities   We have recently proposed an explanation for the birth velocities of pulsars
as resulting from asymmetries due to neutrino oscillations in the cooling
protoneutron star. A specific prediction of this mechanism is that the
correlation of velocities and magnetic fields should be stronger for slowly
rotating neutron stars and weaker for those whose periods are less than 1 s. A
remarkable agreement of this prediction with the data favors the oscillation
mechanism over the alternative explanations for the proper motion of pulsars.

11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom