Two-point functions in (loop) quantum cosmology

  title={Two-point functions in (loop) quantum cosmology},
  author={Gianluca Calcagni and Steffen Gielen and Daniele Oriti},
The path-integral formulation of quantum cosmology with a massless scalar field as a sum-over-histories of volume transitions is discussed, with particular but non-exclusive reference to loop quantum cosmology. Exploiting the analogy with the relativistic particle, we give a complete overview of the possible two-point functions, pointing out the choices involved in their definitions, deriving their vertex expansions and the composition laws they satisfy. We clarify the origin and relations of… CONTINUE READING

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