Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Indecomposable semiinfinite string-localized positive energy matter and
  "darkness"   In the absence of interactions indecomposable positive energy quantum matter
comes in form of three families of which the massless so called "infinite spin"
family which appeared first in Wigner's famous 1939 work is (if mentioned at
all) usually dismissed as "unphysical" but without indicating what principle
(if at all) is being violated. Using novel methods which are particularly
suited for problems of localization, it was shown that these representations
cannot be generated by pointlike localized fields but rather require the
introduction of string-like generators which are localized along semiinfinite
spacelike strings. We argue that such objects can neither be registered in
quasilocal Araki-Haag counters nor pair-produced from standard matter.
Reviewing the mathematical status of Murphy's law in local quantum physics
(everything which is not prohibited to couple does indeed couple) off and on
shell, we are led to the result that perfect darkness is only possible in QFT
with string-localized fields. PACS: 95.35+d, 11.10-z, 11.30Cp

22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys