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dc.contributor.authorKirsten, Klauscat
dc.contributor.authorGarriga Torres, Jaumecat
dc.description.abstractThe issue of de Sitter invariance for a massless minimally coupled scalar field is examined. Formally, it is possible to construct a de Sitterinvariant state for this case provided that the zero mode of the field is quantized properly. Here we take the point of view that this state is physically acceptable, in the sense that physical observables can be computed and have a reasonable interpretation. In particular, we use this vacuum to derive a new result: that the squared difference between the field at two points along a geodesic observers spacetime path grows linearly with the observers proper time for a quantum state that does not break de Sitter invariance. Also, we use the Hadamard formalism to compute the renormalized expectation value of the energy-momentum tensor, both in the O(4)-invariant states introduced by Allen and Follaci, and in the de Sitterinvariant vacuum. We find that the vacuum energy density in the O(4)-invariant case is larger than in the de Sitterinvariant case.eng
dc.publisherThe American Physical Societyeng
dc.relation.isformatofReproducció digital del document publicat en format paper, proporcionada per PROLA i
dc.relation.ispartofPhysical Review D, 1993, vol. 48, núm. 2, p. 567-577cat
dc.rights(c) The American Physical Society, 1993eng
dc.sourceArticles publicats en revistes (Física de la Matèria Condensada)-
dc.subject.classificationTeoria quàntica de campscat
dc.subject.otherQuantum field theoryeng
dc.titleMassless minimally coupled fields in de Sitter space: O(4)-symmetric states versus de Sitter invariant vacuumeng
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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