Amitsur groups of primitive Fano threefolds

Abstract

We classify possible Amitsur groups of smooth primitive Fano threefolds defined over complex numbers that admit a faithful action of a finite group. We also classify the Amitsur groups for toric Fano threefolds.

arXiv comment22 pages; version 2. complete the classification for family 3.2, fixed details for family 3.1 and some typos at various places, added acknowledgements and MSC classes. Comments welcome