Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Quasinormal Modes of Quasinormal Modes   Modifying black hole horizon can drastically change the spectrum of
quasinormal modes. But if the modification is close enough to the horizon the
ringdown signal remains almost unaltered, and well described by the quasinormal
modes of the original GR solution. I show how the original quasinormal modes
emerge in the sum over the new modes.

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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg