Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How Frustrated Strings Would Pull the Black Holes from the Centers of
  Galaxies   Recently Pen and Spergel (1997) have shown that a universe whose energy
density is dominated by a frustrated network of non-Abelian TeV-scale cosmic
strings could account for a broad class of cosmological observations. In this
paper we consider the effects of such a string network on the massive black
holes widely believed to inhabit the centers of many galaxies. As these black
holes traverse the universe together with their host galaxies, they would
intersect a large number of string segments. We argue that such segments would
become stuck to the black hole, and be stretched by the hole's motion.
Stretching the strings would cause significant deceleration of the black holes.
Although the black holes would probably not be removed from the galaxies
completely, they would be noticeably displaced from the galactic center of mass
-- by at least 5kpc. This displacement seems to be is contradiction to the
observational evidence.

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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
1
The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: physics