Existence of ground states for approximately inner two--parameter $C_0$--groups on $C^*$--algebras

Authors

  • A. Niknam Department of Mathematics, Mashhad Branch, Islamic Azad University, Mashhad, Iran.
  • R. Abazari Department of Mathematics, Mashhad Branch, Islamic Azad University, Mashhad, Iran.
Abstract:

In this paper, we generalize the definitions of approximately inner $C_0$-groups and their ground states to the two- parameter case and study necessary and sufficient conditions for a state to be ground state. Also we prove that any approximately inner two- parameter $C_0$--group must have at least one ground state. Finally some applications are given.

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Journal title

volume 42  issue 2

pages  435- 446

publication date 2016-04-01

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