Taming the α-vacuum

摘要: An interacting scalar field theory in de Sitter space appears to be nonrenormalizable for a generic $\ensuremath{\alpha}$-vacuum state. This pathology arises since the usual propagator used allows constructive interference among propagators loop corrections, which produces divergences that are not proportional standard counterterms. can avoided by defining new based on generalized time-ordering prescription. The generating functional associated with this contains source couples both at point and its antipode. To one order, we show set of theories very general antipodal interactions is causal renormalizable.