Non commutative Lp spaces without the completely bounded approximation property

Details Non commutative Lp spaces without the completely bounded approximation property Non commutative Lp spaces without the completely bounded approximation property

2010-04-14

arxiv.org/abs/1004.2327v3

Mathematics

Operator Algebras

v3; Minor corrections according to the referees

Scientific paper

For any 1\leq p \leq \infty different from 2, we give examples of non-commutative Lp spaces without the completely bounded approximation property. Let F be a non-archimedian local field. If p>4 or p<4/3 and r\geq 3 these examples are the non-commutative Lp-spaces of the von Neumann algebra of lattices in SL_r(F) or in SL_r(\R). For other values of p the examples are the non-commutative Lp-spaces of the von Neumann algebra of lattices in SL_r(F) for r large enough depending on p. We also prove that if r \geq 3 lattices in SL_r(F) or SL_r(\R) do not have the Approximation Property of Haagerup and Kraus. This provides examples of exact C^*-algebras without the operator space approximation property.

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