期刊
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
卷 23, 期 1, 页码 -出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271814300018
关键词
de Sitter space; quantum fields in curved spacetime; particle creation
资金
- Ministry of Education and Science of Russian Federation [8207]
- [NSh-6260.2010.2]
- [RFBR-11-02-01227-a]
We discuss peculiarities of quantum fields in de Sitter (dS) space on the example of the self-interacting massive real scalar, minimally coupled to the gravity background. Nonconformal quantum field theories (QFTs) in dS space show very special infrared behavior, which is not shared by quantum fields neither in flat nor in anti-dS space: in dS space loops are not suppressed in comparison with tree level contributions because there are strong infrared corrections. That is true even for massive fields. Our main concern is the interrelation between these infrared effects, the invariance of the QFT under the dS isometry and the (in) stability of dS invariant states (and of dS space itself) under nonsymmetric perturbations.
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