Exploring f(T) gravity via strongly lensed fast radio bursts

Author:

Jiang Xinyue1,Ren Xin234,Li Zhao23,Cai Yi-Fu23,Er Xinzhong1ORCID

Affiliation:

1. South-Western Institute for Astronomy Research, Yunnan University , Kunming 650500 , China

2. CAS Key Laboratory for Researches in Galaxies and Cosmology/Department of Astronomy, School of Astronomy and Space Science, University of Science and Technology of China , 96 Jinzhai Road, Hefei, Anhui 230026 , China

3. Deep Space Exploration Laboratory/School of Physical Sciences, University of Science and Technology of China , Hefei, Anhui 230026 , China

4. Department of Physics, Tokyo Institute of Technology 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8551 , Japan

Abstract

ABSTRACT This study aims to investigate the strong gravitational lensing effects in f(T) gravity. We present the theoretical analytic expressions for the lensing effects in f(T) gravity, including deflection angle, magnification, and time delay. On this basis, we also take the plasma lensing effect into consideration. We compare the lensing effects between the General Relativity in a vacuum environment and the f(T) gravity in a plasma environment. From a strongly lensed fast radio burst, the results indicate that in a plasma environment, General Relativity and f(T) gravity can generate indistinguishable image positions, but the magnification and time delay on these positions are significantly different, which can be distinguished by current facilities in principle. Therefore, the discrepancies between observational results and theoretical expectations can serve as clues for a modified gravity theory and provide constraints on f(T) gravity.

Funder

China Scholarship Council

University of Science and Technology of China

Publisher

Oxford University Press (OUP)

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