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Massless interacting scalar quantum fields in deSitter spacetime

Hollands, Stefan 2012. Massless interacting scalar quantum fields in deSitter spacetime. Annales Henri Poincare 13 (4) , pp. 1039-1081. 10.1007/s00023-011-0140-1

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We generalize key aspects of gr-qc/1010.5367 (and also gr-qc/1010.5327) to the case of massless lf2n2n quantum field theory on deSitter spacetime. As in that paper, our key objective is to derive a suitable “Mellin-Barnes-type” representation of deSitter correlation functions in a deSitter-invariant state, which holds to arbitrary orders in perturbation theory, and which incorporates renormalization. The representation is suitable for the study of large distance/time properties of correlation functions. It is arrived at via an analytic continuation from the corresponding objects on the sphere, and, as in the massive case, relies on the use of graph-polynomials and their properties, as well as other tools. However, the perturbation expansion is organized somewhat differently in the massless case, due to the well-known subtleties associated with the “zero-mode” of the quantum field. In particular, the correlation functions do not possess a well-defined limit as the self-coupling constant of the field goes to zero, reflecting the well-known non-existence of a deSitter invariant state in the free massless scalar theory. We establish that generic correlation functions cannot grow more than polynomially in proper time for large time-like separations of the points. Our results thus leave open the possibility of quantum-induced IR-instabilities of deSitter spacetime on very large time-scales.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Mathematics
Subjects: Q Science > QA Mathematics
Additional Information: Online first.
Publisher: Birkhäuser Basel
ISSN: 1424-0661
Last Modified: 10 Oct 2017 13:32

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