Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Equilibration of quantum systems and subsystems   We unify two recent results concerning equilibration in quantum theory. We
first generalise a proof of Reimann [PRL 101,190403 (2008)], that the
expectation value of 'realistic' quantum observables will equilibrate under
very general conditions, and discuss its implications for the equilibration of
quantum systems. We then use this to re-derive an independent result of Linden
et. al. [PRE 79, 061103 (2009)], showing that small subsystems generically
evolve to an approximately static equilibrium state. Finally, we consider
subspaces in which all initial states effectively equilibrate to the same
state.

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The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci