2009/09/30 by Emil T. Akhmedov
Physics and Astronomy · #hep-th #gr-qc
paper · pdf · doi:10.1142/s0217732310034043
published as Mod.Phys.Lett.A25:2815-2823,2010 · 6 pages, Final version to appear in MPLA
arxiv created 2010/07/06 · arxiv updated 2015/05/14
Using properly defined Feynman propagator we obtain non--zero imaginary contribution to the scalar field effective action in even dimensional de Sitter space. Such a propagator follows from the path integral in de Sitter space and obeys composition principle proposed in arXiv:0709.2899. The obtained expression for the effective action shows particle production with the Gibbons--Hawking rate.