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Tahereh Azizi

Tahereh Azizi

Academic rank: Assistant Professor
ORCID:
Education: PhD.
ScopusId:
Faculty: Science
Address:
Phone: 35302480

Research

Title
Godel-type Universes in Palatini f(R) Gravity with a Non-minimal Curvature-matter Coupling
Type
JournalPaper
Keywords
Modified gravity, Non-minimal curvature-matter coupling, Godel-type universe
Year
2016
Journal INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
DOI
Researchers Tahereh Azizi ، Emad Yaraie

Abstract

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.