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happy new year everybody,

I am reading "quantum gravity" of Rovelli.

He introduces functions f(x,t) defined on compact of space time that are zero outside.

They correspond to the time and space needed to a measurement.

page 168: they generalize conventional wave packets for which [tex]f(x,t) = f(x) \delta(t) [/tex] which are associated to instantaneous measurements.

There is no equation for them

He constructs the usual wave fonction [tex]\phi(x',t') = \int dx dt w(x',t',x,t) f(x,t)[/tex]

Where w is the propagator. This wave function satisfies the Schrodinger equation.

We lose the information we had with f!

He says f and f' are equivalent iff they give the same [tex]\phi[/tex]

Ok but why have we not to use the information in f?

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# Spacetime states in Rovelli's book Quantum Gravity

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