مشخصات پژوهش

عنوان	COMPARISON OF FRAMES: JORDAN VERSUS EINSTEIN FRAME FOR A NON-MINIMAL DARK ENERGY MODEL
نوع پژوهش	مقاله چاپ شده
کلیدواژه‌ها	Scaler{tensor theories; dark energy models; bouncing solutions.
چکیده	We construct a dark energy model where a scalar eld non-minimally coupled to gravity plays the role of the dark component. We compare cosmological consequences of this non-minimal coupling of the scalar eld and gravity in the spirit of the dark energy paradigm in Jordan and Einstein frames. Some important issues such as phantom divide line crossing, existence of the bouncing solutions and the stability of the solutions are compared in these two frames. We show that while a non-minimally coupled scalar eld in the Jordan frame is a suitable dark energy component with capability to realize phantom divide line crossing, its conformal transformation in the Einstein frame does not have this capability. The conformal transformation from Jordan frame to Einstein frame transforms the equation of state parameter of the dark energy component to its minimal form with a rede ned scalar eld and in this case it is impossible to realize a phantom phase with possible crossing of the phantom divide line.
پژوهشگران	سید داود ساداتیان (نفر دوم)، کوروش نوذری (نفر اول)