EXTREMALLY ACCELERATED OBSERVERS IN STATIONARY AXISYMMETRICAL SPACETIMES

Stationary observers with the extremal value of the total thrust, cons idered in stationary axisymmetric spacetimes, have interesting privile ges: they Fermi-transport their 4-acceleration, and those with zero ve rtical acceleration measure that the particles on local radially non-a ccelerated circular orbits co- and counter-rotate with the same modulu s of velocity.