2018/05/31 by Siamak Akhshabi · 1 citation
Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #Classical mechanics #Cosmology and Gravitation Theories #Galaxy #Gauge theory #General relativity #Gravitation #Gravitational lens #Gravitational redshift #Mathematical physics #Physics #Pulsars and Gravitational Waves Research #Speed of gravity #Theoretical physics #Torsion (gastropod) #gr-qc
paper · pdf · doi:10.1142/s0217732319500299
published in Modern Physics Letters A 34(04), 1950029 (World Scientific) · 7 pages, 1 figure
arxiv created 2018/06/27 · arxiv updated 2019/01/09 · openalex publication_date 2019/01/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the propagation of light rays and evolution of optical scalars in gauge theories of gravity where torsion is present. Recently, the modified Raychaudhuri equation in the presence of torsion has been derived. We use this result to derive the basic equations of geometric optics for several different interesting solutions of the Poincaré gauge theory of gravity. The results show that the focusing effects for neighboring light rays will be different than general relativity. This in turn has practical consequences in the study of gravitational lensing effects and also in determining the angular diameter distance for cosmological objects.