Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Black Holes - Estimation of Their Lower and Upper Mass Limits Stemming
  from the Model of Expansive Nondecelerative Universe   In this contribution, the thermodynamics of black holes is treated by the
model of Expansive Nondecelerative Universe (ENU). Based on entropy
considerations and localization of gravitational energy, estimation of both the
lower and upper mass limits of black holes is given. Both mass limits are time
dependent.

21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph