Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Illuminating Black Hole Binary Formation Channels with Spins in Advanced
  LIGO   The recent detections of the binary black hole mergers GW150914 and GW151226
have inaugurated the field of gravitational-wave astronomy. For the two main
formation channels that have been proposed for these sources, isolated binary
evolution in galactic fields and dynamical formation in dense star clusters,
the predicted masses and merger rates overlap significantly, complicating any
astrophysical claims that rely on measured masses alone. Here, we examine the
distribution of spin- orbit misalignments expected for binaries from the field
and from dense star clusters. Under standard assumptions for black-hole natal
kicks, we find that black-hole binaries similar to GW150914 could be formed
with significant spin-orbit misalignment only through dynamical processes. In
particular, these heavy-black-hole binaries can only form with a significant
spin-orbit anti-alignment in the dynamical channel. Our results suggest that
future detections of merging black hole binaries with measurable spins will
allow us to identify the main formation channel for these systems.

26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
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The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc