### Abstract

Our main result provides a closed expression for the completely bounded Fourier multiplier norm of the spherical functions on the generalized Lorentz groups SO_{0}(1, n) (for n ≥ 2). As a corollary, we find that there is no uniform bound on the completely bounded Fourier multiplier norm of the spherical functions on the generalized Lorentz groups. We extend the latter result to the groups SU(1, n), Sp(1, n) (for n ≥ 2) and the exceptional group F_{4(-20)}, and as an application we obtain that each of the above mentioned groups has a completely bounded Fourier multiplier, which is not the coefficient of a uniformly bounded representation of the group on a Hilbert space.

Original language | English |
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Journal | Advances in Operator Theory |

Volume | 3 |

Issue number | 1 |

Pages (from-to) | 193-230 |

DOIs | |

Publication status | Published - 2018 |

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### Keywords

- Completely bounded Fourier multiplier norm
- Generalized Lorentz group
- Lie group
- Representation
- Spherical function

### Cite this

*Advances in Operator Theory*,

*3*(1), 193-230. https://doi.org/10.22034/aot.1706-1172