Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Universal Arrow of Time III-IV:(Part III) Nonquantum gravitation
  theory (Part IV) Quantum gravitation theory   The paper consists of the two independent papers - the first one about
Nonquantum Gravitation theory, the second one about Quantum Gravitation theory
(Part III: Nonquantum Gravitation theory) The first paper is dealing with the
analysis of general relativity theory (theory of gravitation) from the point of
view of thermodynamic time arrow. Within this framework "informational paradox"
for black holes and "paradox with the grandfather" for time travel "wormholes"
are resolved. (Part IV: Quantum gravitation theory) The second paper is dealing
with the analysis of quantum gravitation theory from the point of view of
thermodynamic time arrow. Within this framework "informational paradox" for
black holes and "paradox with the grandfather" for time travel "wormholes",
black stars, Penrose's project of new quantum gravitation theory, anthropic
principle are considered.

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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
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The categories of this paper are: eess
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph