Applied Physics and Mathematics Annotation << Back GRAVITATIONAL RED SHIFT IN OPTICAL VORTICES YU.A. PORTNOV The magnitude of the gravitational redshift was mathematically calculated and experimentally measured back in the 20th century. The end of the 20th century brought to optics a new concept of an optical vortex, this light possessing an orbital moment. The main hypothesis of this work is that the redshift value for the optical vortex will be smaller than for ordinary light waves. To confi rm this hypothesis, a mathematical apparatus of seven-dimensional space-time is applied to electromagnetism. Then the magnitude of the gravitational redshift for optical vortices is compared with the value for ordinary electromagnetic waves. Keywords: redshift; optical vortex; twisted light; angular momentum. Contacts: E-mail: portnovyura@yandex.ru Pp. 12-16.