نوع مقاله : مقاله پژوهشی

نویسنده

دانشکدة فیزیک، دانشگاه دامغان، دامغان

چکیده

در این مقاله ما به بررسی کیهان‌شناسی در نظریۀ رستال می‌پردازیم که با یک جفت‌شدگی غیرکمینه با مادۀ باریونی تعمیم یافته است. در نظریۀ رستال، تانسور انرژی تکانه پایسته نیست و این عدم پایستگی به تغییرات انحنای فضا مرتبط است. در این مقاله این وابستگی را به گونه‌ای تعمیم داده‌ایم که شامل خود مادۀ باریونی هم بشود. بررسی کیهان‌شناسی این مدل تعمیم‌یافته مقدار فراوانی مادۀ باریونی بیشتری نسبت به مدل استاندارد   پیش‌بینی می‌کند. همچنین نشان خواهیم داد که دینامیک این سامانه مشابه با مدل  با یک درجه آزادی بیشتر است‏.

کلیدواژه‌ها

عنوان مقاله [English]

Cosmology in Rastall theory with non-minimal matter coupling

نویسنده [English]

  • SH Shahidi

Department of Physics, Damghan University, Damghan, Iran

چکیده [English]

In this paper we will consider cosmological implications of the Rastall theory with a non-minimal coupling with baryonic matter fields. In Rastall theory, the matter energy-momentum tensor is not conserved and the non-conservation is related to the curvature. We will generalize this relation to become dependent on both curvature and matter fields. Cosmology of the model shows more matter abundance compared to the  model. We will show that the dynamical system of the model is the same as with an additional degree of freedom.

کلیدواژه‌ها [English]

  • cosmology
  • modified gravity
  • Rastall theory
  • matter couplings
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