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کوروش نوذری

کوروش نوذری

مرتبه علمی: استاد
ارکید: https://orcid.org/0000-0003-4368-5823
تحصیلات: دکترای تخصصی
اسکاپوس: 9276301800
دانشکده: دانشکده علوم پایه
نشانی: بابلسر- دانشگاه مازندران- دانشکده علوم پایه- گروه فیزیک نظری
تلفن: 01135302482

مشخصات پژوهش

عنوان
On the evolution and stability of cosmological perturbations in higher order scalar–tensor theories of gravity
نوع پژوهش
JournalPaper
کلیدواژه‌ها
Cosmological Perturbation Theory
سال
2019
مجله CANADIAN JOURNAL OF PHYSICS
شناسه DOI
پژوهشگران fateme Rajabi ، Kourosh Nozari

چکیده

We study a new type of extended theory of gravity in the framework of general scalar–tensor theories in which the higher order terms of curvature are coupled with a scalar field and its derivatives. We analyze the stability and evolution of cosmological perturbations in this setup. For this purpose, we perturb the Hubble parameter, matter density, and scalar field to check stability and evolution of perturbations to first order. In this framework, we investigate stability conditions for de Sitter and power law solutions and we examine viability of cosmological evolution of these perturbations. We consider some specific f(R) models and show that the stability analysis gives some constraints on the parameters of these models.