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Paper   IPM / M / 16074
School of Mathematics
  Title:   Ideals of the quantum group algebra, Arens regularity and weakly compact multipliers
  Author(s):  Mehdi Nemati (Joint with M. Rajaei Rizi)
  Status:   To Appear
  Journal: Canad. Math. Bull.
  Supported by:  IPM
Let \Bbb G be a locally compact quantum group and let I be closed ideal of L1(\Bbb G) with yI ≠ 0 for some ysp(L1(\Bbb G)). In this paper, we give a characterization for compactness of \Bbb G in terms of the existence of a weakly compact left or right multiplier T on I with T(f)(yI) ≠ 0 for some fI. Using this, we prove that I is an ideal in its second dual if and only if \Bbb G is compact. We also study Arens regularity of I whenever it has a bounded left approximate identity. Finally, we obtain some characterizations for amenability of \Bbb G in terms of the existence of some I-module homomorphisms on I** and on I*.

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