گرانش همديس خطي در جهان دوسيته

Conformal Gravity in de Sitter Universe

مطالعات جدید نجومی حكایت از انبساط شتاب دار عالم دارد و همچنین نشان می دهد كه عالم در فاز دوسیته است. ... Recent astrophysical data indicate that our universe might currently be in a de Sitter (dS) phase. Quantum field theory in dS space-time has evolved as an exceedingly important subject, studied by many authors in the course of the past decade. The importance of dS space has been primarily ignited by the study of the inflationary model of the universe and the quantum gravity. It was pointed out that Einstein’s theory of gravitation, in the linear approximation and in the background field method, can be considered as a massless symmetric tensor field of rank-2. Contrary to the Maxwell equations (which may be regarded as the equations of massless spin-1 particle), Einstein’s equation of graviton is not conformally invariant. In this paper Diracs six-cone formalism is used to obtain wave equations in de Sitter space-time that are invariant. This study is motivated by the belief that the conformal invariance may be the key to the future theory of quantum gravity. Conformally