期刊
PHYSICAL REVIEW D
卷 78, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.78.063534
关键词
-
资金
- National Science Foundation [PHY-0455649]
It is shown that the generating function for tree graphs in the in-in'' formalism may be calculated by solving the classical equations of motion subject to certain constraints. This theorem is illustrated by application to the evolution of a single inflaton field in a Robertson-Walker background.
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