Background independence in a nutshell: the dynamics of a tetrahedron

  title={Background independence in a nutshell: the dynamics of a tetrahedron},
  author={C. Rovelli and D. Colosi and L. Doplicher and W. Fairbairn and Leonardo Modesto and K. Noui},
  journal={Classical and Quantum Gravity},
  • C. Rovelli, D. Colosi, +3 authors K. Noui
  • Published 2005
  • Physics
  • Classical and Quantum Gravity
  • We study how physical information can be extracted from a background-independent quantum system. We use an extremely simple 'minimalist' system that models a finite region of 3D Euclidean quantum spacetime with a single equilateral tetrahedron. We show that the physical information can be expressed as a boundary amplitude. We illustrate how the notions of 'evolution' in a boundary proper time and 'vacuum' can be extracted from the background-independent dynamics. 
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