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Conference Paper

2-point functions in quantum cosmology

MPS-Authors
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Gielen,  Steffen
Microscopic Quantum Structure & Dynamics of Spacetime, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Fulltext (public)

1108.6059
(Preprint), 113KB

JoPCS_360_1_012029.pdf
(Any fulltext), 372KB

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Citation

Gielen, S. (2012). 2-point functions in quantum cosmology. Journal of Physics: Conference Series, 360: 012029.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0012-312C-4
Abstract
We discuss the path-integral formulation of quantum cosmology with a massless scalar field as a sum-over-histories, with particular reference to loop quantum cosmology. Exploiting the analogy with the relativistic particle, we give a complete overview of the possible two-point functions, deriving vertex expansions and composition laws they satisfy. We clarify the tie between definitions using a group averaging procedure and those in a deparametrised framework. We draw some conclusions about the physics of a single quantum universe and multiverse field theories where the role of these sectors and the inner product are reinterpreted.