# Live blogging: Dittrich

More difficult example (due to Dittrich & Tambornino): Two-point function of scalar field relative to (four) clock scalars.

${\phi(\Psi), \phi(\Psi + \epsilon)} = G(\Psi, \Psi + \epsilon) \left ( 1 + \frac{Energy(\phi)}{Energy(\Psi)} \right )$

where G is the Green’s function on fixed background.

The resolution limit for degrees of freedom depends on the energy of clocks: the higher the energy, the higher the resolution.

There is general amusement at the proposal for “fashionable” clocks: Just change clocks whenever necessary!