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ABELIAN GAUGE THEORY IN DE SITTER SPACE
Quantization of spinor and vector free fields in four-dimensional de Sitter spacetime, in the ambient space notation, has been studied in the previous works. Various two-point functions for the aboveExpand
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Conformally invariant wave equations and massless fields in de Sitter spacetime
Conformally invariant wave equations in de Sitter space, for scalar and vector fields, are introduced in the present paper. Solutions of their wave equations and the related two-point functions, inExpand
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Exact analytical expression for magnetoresistance using quantum groups
Abstract We obtain an exact analytical expression for magnetoresistance using noncommutative geometry and quantum groups. Then we will show that there is a deep relationship between magnetoresistanceExpand
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N=1 de Sitter supersymmetry algebra
Abstract Recalling the universal covering group of de Sitter universe, the transformation properties of the spinor fields ψ ( x ) and ψ ¯ ( x ) , in the ambient space notation, are presented in thisExpand
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“Massless” vector field in de Sitter universe
We proceed to the quantization of the massless vector field in the de Sitter (dS) space. This work is the natural continuation of a previous article devoted to the quantization of the dS massiveExpand
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Quantum Gravity in Krein Space Quantization
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A Naturally Renormalized Quantum Field Theory
It was shown that quantum metric fluctuations smear out the singularities of Green functions on the light cone (Ford, arXiv:gr-qc/9707062), but it does not remove other ultraviolet divergences of theExpand
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Conformal invariance wave equations in de Sitter space
Conformally invariant wave equations in de Sitter space, for scalar and vector fields, are introduced in the present paper. Solutions of their wave equations and the related two-point functions, inExpand
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Observational constraints and stability in viscous gravity
In this paper, we study the gravity model in the presence of bulk viscosity by the flat Friedmann–Robertson–Walker metric. The field equation is obtained by teleparallel gravity with a tetrad field...