4 papers
A Natural Renormalization of the One-Loop Effective Action for Scalar Field in Curved Space-time
Mohammad Vahid Takook
It has been shown that the negative norm states necessarily appear in a covariant quantization of the free minimally coupled scalar field in de Sitter space [1,2]. In this process…
Negative Norm States in de Sitter Space and QFT without Renormalization Procedure
Mohammad Vahid Takook
In recent papers [1,2], it has been shown that the presence of negative norm states or negative frequency solutions are indispensable for a fully covariant quantization of the mini…
Covariant two point function for minimally coupled scalar field in de Sitter space-time
Mohammad Vahid Takook
In a recent paper [1], it has been shown that negative norm states are indispensable for a fully covariant quantization of the minimally coupled scalar field in de Sitter space. Th…
Covariant two-point function for linear gravity in de Sitter space
M. V. Takook
The Wightman two-point function for the gravitational field in the linear approximation (the rank-2 ``massless'' tensor field) on de Sitter space has a pathological behaviour for l…