On the spinfoam expansion in cosmology

Details On the spinfoam expansion in cosmology On the spinfoam expansion in cosmology

2009-11-16

arxiv.org/abs/0911.3097v2

Class.Quant.Grav.27:145005,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages (typos corrected)

Scientific paper

10.1088/0264-9381/27/14/145005

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".

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