Nine years after this paper was written (https://arxiv.org/abs/1503.00712 ), it has been finally published in a journal.
I believe that this paper suggests some direction to one of the most important questions in theoretical physics.
We must wake up the thought that has remained dormant until now due to our ignorance or indifference.

We hope that this paper contributes to uncovering the dormant picture on the remarkable connection
between symplectic electromagnetism and gravity, and sheds light on a missing corner in our
understanding of quantum gravity.