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Article Dans Une Revue Classical and Quantum Gravity Année : 2010

On the spinfoam expansion in cosmology

Résumé

We consider the technique introduced in a recent work by Ashtekar, Campiglia and Henderson, which generate a spinfoam-like sum from a Hamiltonian theory. We study the possibility of using it for finding the generalized projector of a constraint on physical states, without first deparametrising the system. We illustrate this technique in the context of a very simple example. We discuss the infinities that appear in the calculation, and argue that they can be appropriately controlled. We apply these ideas to write a spinfoam expansion for the "dipole cosmology".

Dates et versions

hal-00432781 , version 1 (17-11-2009)

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Carlo Rovelli, Francesca Vidotto. On the spinfoam expansion in cosmology. Classical and Quantum Gravity, 2010, 27 (14), pp.145005. ⟨10.1088/0264-9381/27/14/145005⟩. ⟨hal-00432781⟩
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