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Proper time method in de Sitter space

We use the proper time formalism to study a (non-self-interacting) massive Klein-Gordon theory in the two dimensional de Sitter space. We determine the exact Green's function of the theory by solving the DeWitt-Schwinger equation as well as by calculating the operator matrix element. We point out how the one parameter family of arbitrariness in the Green's function arises in this method.

preprint2015arXivOpen access
Ashok K. DasPushpa Kalauni
gr-qchep-th
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Ashok K. DasPushpa Kalauni

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