09 بهمن 1401
طاهره عزيزي

طاهره عزیزی

مرتبه علمی: استادیار
نشانی:
تحصیلات: دکترای تخصصی / فیزیک
تلفن: 35302480
دانشکده: دانشکده علوم پایه

مشخصات پژوهش

عنوان Godel-type Universes in Palatini f(R) Gravity with a Non-minimal Curvature-matter Coupling
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Modified gravity, Non-minimal curvature-matter coupling, Godel-type universe
مجله INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
شناسه DOI 10.1007/s10773-015-2647-6
پژوهشگران طاهره عزیزی (نفر اول) ، عماد یارایی (نفر دوم)

چکیده

In this paper, we consider the G¨odel-type universes and study the issue of causality in a modified gravity with a non-minimal curvature-matter coupling within the Palatini approach. To examine the causality violation in this model, we assume two kinds of matter sources, a perfect fluid and a scalar field. We show that in the case of a perfect fluid, there exist a critical radius rc which beyond that the casuality is violated. On the other hand, assuming a scalar field as the matter source, the critical radius is being infinity thus the breakdown of causality is forbidden.