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- W1845144927 abstract "We generalize key aspects of arXiv:1010.5367 (and also arXiv:1010.5327) to the case of {em massless} $lambda phi^{2n}$ 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." @default.
- W1845144927 created "2016-06-24" @default.
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- W1845144927 date "2011-11-09" @default.
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- W1845144927 title "Massless Interacting Scalar Quantum Fields in deSitter Spacetime" @default.
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- W1845144927 doi "https://doi.org/10.1007/s00023-011-0140-1" @default.
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