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Remark on the energy spectrum of a decaying system

Pavel Exner

TBD mathscidoc:1910.43094

Communications in Mathematical Physics, 50, (1), 1-10, 1976.2
Some time-evolution operators of a general unstable system lead to unphysical spectrum (unbounded below) of the total Hamiltonian. Various necessary conditions for boundeness of the spectrum are known. It is shown here, how this spectrum can be determined, which, in particular, gives the sufficient condition.
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@inproceedings{pavel1976remark,
  title={Remark on the energy spectrum of a decaying system},
  author={Pavel Exner},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020125721174530623},
  booktitle={Communications in Mathematical Physics},
  volume={50},
  number={1},
  pages={1-10},
  year={1976},
}
Pavel Exner. Remark on the energy spectrum of a decaying system. 1976. Vol. 50. In Communications in Mathematical Physics. pp.1-10. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020125721174530623.
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