%0 Journal Article %1 Rovelli2009 %A Rovelli, Carlo %A Vidotto, Francesca %D 2009 %K Constraints lqc lqg spinfoam %T On the spinfoam expansion in cosmology %U http://arxiv.org/abs/0911.3097 %X 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".

@article{Rovelli2009, abstract = { 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". }, added-at = {2010-02-14T22:30:17.000+0100}, author = {Rovelli, Carlo and Vidotto, Francesca}, biburl = {https://www.bibsonomy.org/bibtex/2e4584361add647c6203e411e9892ac0b/random3f}, description = {[0911.3097] On the spinfoam expansion in cosmology}, interhash = {f188c3861aa37f632ddf7ec234564d76}, intrahash = {e4584361add647c6203e411e9892ac0b}, keywords = {Constraints lqc lqg spinfoam}, note = {cite arxiv:0911.3097 Comment: 6 pages}, timestamp = {2010-02-14T22:30:17.000+0100}, title = {On the spinfoam expansion in cosmology}, url = {http://arxiv.org/abs/0911.3097}, year = 2009 }