The Renormalized Energy-Momentum Tensor in a Robertson-Walker Universe
نویسندگان
چکیده
منابع مشابه
Inhomogeneous Viscous Fluids in a Friedmann-Robertson-Walker (FRW) Universe
We give a brief review of some aspects of inhomogeneous viscous fluids in a flat Friedmann-Robertson-Walker Universe. In general, it is pointed out that several fluid models may bring the future Universe evolution to become singular, with the appearance of the so-called Big Rip scenario. We investigate the effects of fluids coupled with dark matter in a de Sitter Universe, by considering severa...
متن کاملOn the Asymptotic Character of Electromagnetic Waves in a Friedmann-Robertson-Walker Universe
Asymptotic properties of electromagnetic waves are studied within the context of Friedmann-Robertson-Walker (FRW) cosmology. Electromagnetic fields are considered as small perturbations on the background spacetime and Maxwell’s equations are solved for all three cases of flat, closed and open FRW universes. The asymptotic character of these solutions are investigated and their relevance to the ...
متن کاملFriedmann-robertson-walker Cosmologies
Abstract. Electrodynamics for self-interacting scalar fields in spatially flat FriedmannRobertson-Walker space-times is studied. The corresponding one-loop field equation for the expectation value of the complex scalar field in the conformal vacuum is derived. For exponentially expanding universes, the equations for the Bogoliubov coefficients describing the coupling of the scalar field to grav...
متن کاملTwo formalisms , one renormalized stress - energy tensor
We explicitly compare the structure of the renormalized stress-energy tensor of a massless scalar field in a ð1þ 1Þ curved spacetime as obtained by two different strategies: normal-mode construction of the field operator and one-loop effective action. We pay special attention to where and how the information related to the choice of vacuum state in both formalisms is encoded. By establishing a ...
متن کاملChaos in Robertson-Walker Cosmology
Chaos in Robertson-Walker cosmological models where gravity is coupled to one or more scalar fields has been studied by a few authors, mostly using numerical simulations. In this paper we begin a systematic study of the analytical aspect. We consider one conformally coupled scalar field and, using the fact that the model is integrable when the field is massless, we show in detail how homoclinic...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1981
ISSN: 0033-068X,1347-4081
DOI: 10.1143/ptp.66.892