Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Spacetime states in Rovelli's book Quantum Gravity

  1. Jan 3, 2009 #1

    naima

    User Avatar
    Gold Member

    spacetime states in Rovelli's book "Quantum Gravity"

    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?
     
  2. jcsd
  3. Jan 8, 2009 #2

    naima

    User Avatar
    Gold Member

    Re: spacetime states in Rovelli's book "Quantum Gravity"

    I found this: http://arxiv.org/abs/gr-qc/0111016" [Broken]
    It seems to be a new formalism building classical Quantum Mechanics upon "test functions" (the spacetime states)
     
    Last edited by a moderator: May 3, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Spacetime states in Rovelli's book Quantum Gravity
  1. Quantum State (Replies: 28)

  2. What is Quantum state (Replies: 24)

Loading...