Mukul Chandra Das, Rampada Misra, Space-Time Geometry of Electromagnetic Field in the System of Photon, Volume 14, International Letters of Chemistry, Physics and Astronomy (Volume 14)
https://www.scipress.com/ILCPA.14.13
Abstract:
    In the concept of general relativity gravity is the space-time geometry. Again, a relation between electromagnetic field and gravitational field is expected. In this paper, space-time geometry of electromagnetic field in the system of photon has been introduced to unify electromagnetic field and gravitational field in flat and curvature space-time.
Keywords:
    Electromagnetic Field, Space-Time Geometry, Unified Field