نظریه‌های جفت‌شدگی گرانشی متغیر و نظریة راستال تعمیم یافته

شعبانی, حمید

doi:10.22055/jrmbs.2023.18130

نظریه‌های جفت‌شدگی گرانشی متغیر و نظریة راستال تعمیم یافته

نوع مقاله : مقاله پژوهشی کامل

نویسنده

حمید شعبانی

گروه فیزیک، دانشکده علوم، دانشگاه سیستان و بلوچستان، زاهدان، ایران

10.22055/jrmbs.2023.18130

چکیده

در این مقاله، سازگاری مدل کیهان‌شناسی دیراک که منجر به‌نظریات گرانشی با جفت‌شدگی گرانشی متغیر می‌شود در چارچوب نظریة راستال تعمیم یافته مورد مطالعه قرار گرفته است. علاوه بر این، مسألة کیهان شتابدار کنونی در این سناریو بررسی شده است. دو ماده با معادلة حالت‌های متفاوت در نظر گرفته شده‌اند. مادة چندشکلی تعمیم‌یافته، که در بازه‌ای از مقادیر ثابت‌های مدل، سازگاری قابل قبولی با مشاهدات رصدی دارد. همچنین، با بررسی معادلة حالت گاز چاپلین تعمیم یافته نشان داده شد که مدل گرانشی تحت بررسی که شامل این ماده باشد سازگاری کمتری با نتایج نجومی نشان می‌دهد. به‌طور خلاصه، ما به‌این نتیجه رسیدیم که نظریة تعمیم یافتة راستال قادر است با فرضیة دیراک انطباق یافته، منجر به‌کیهان شتابدار کنونی شود.

کلیدواژه‌ها

موضوعات

گرانش و کیهانشناسی

عنوان مقاله [English]

Varying gravitational coupling theories and the Generalized Rastall Theory

نویسنده [English]

Hamid Shabani

Physics Department, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran

چکیده [English]

In this paper, the compatibility of the Dirac cosmological model which leads to gravitational theories with a varying gravitational coupling parameter in the context of the generalized Rastall theory has been studied. Moreover, in this scenario, the problem of the current accelerated expansion of the Universe has been considered. Two different cosmic fluids have been investigated. Generalized Polytropic matter, which leads to an observationally consistent model. Also, considering the generalized Chaplygin gas, it is shown that an astronomically consistent model cannot be obtained. Briefly speaking, we came to the result that the generalized Rastall theory is capable of being matched with the Dirac hypothesis leading to the present accelerated expansion of the Universe.

کلیدواژه‌ها [English]

Dirac hypothesis
Rastall theory
accelerated universe
modified gravity

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