Friday, February 3, 2012

1105.3385 (Etera R. Livine et al.)

Spinor Representation for Loop Quantum Gravity    [PDF]

Etera R. Livine, Johannes Tambornino
We perform a quantization of the loop gravity phase space purely in terms of
spinorial variables, which have recently been shown to provide a direct link
between spin network states and simplicial geometries. The natural Hilbert
space to represent these spinors is the Bargmann space of holomorphic
square-integrable functions over complex numbers. We show the unitary
equivalence between the resulting generalized Bargmann space and the standard
loop quantum gravity Hilbert space by explicitly constructing the unitary map.
The latter maps SU(2)-holonomies, when written as a function of spinors, to
their holomorphic part. We analyze the properties of this map in detail. We
show that the subspace of gauge invariant states can be characterized
particularly easy in this representation of loop gravity. Furthermore, this map
provides a tool to efficiently calculate physical quantities since integrals
over the group are exchanged for straightforward integrals over the complex
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