Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Mass Function of Primordial Rogue Planet MACHOs in quasar
  nanolensing   The recent Sumi et al (2010, 2011) detection of free roaming planet mass
MACHOs in cosmologically significant numbers recalls their original detection
in quasar microlening studies (Schild 1996, Colley and Schild 2003). We
consider the microlensing signature of such a population, and find that the
nano-lensing (microlensing) would be well characterized by a statistical
microlensing theory published previously by Refsdal and Stabel (1991).
Comparison of the observed First Lens microlensing amplitudes with the
theoretical prediction gives close agreement and a methodology for determining
the slope of the mass function describing the population. Our provisional
estimate of the power law exponent in an exponential approximation to this
distribution is $2.98^{+1.0}_{-0.5}.$ where a Salpeter slope is 2.35.

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The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
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The categories of this paper are: eess
9
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: stat
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The categories of this paper are: econ
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int