I don't know if anyone remembers, but I wrote an article in which we discussed the charge [math]\hbar c[/math] as related to the Casimir electron in which it owes it's mass in speculation to an interaction with an off-shell fluctuation of the metric:

https://www.quora.co...awfndllhcyrkfcd

The question of mass and the relativity of charge also has implications to the Regge trajectories, all the important work can be followed in this link:

https://www.quora.co...hzwiiqhtujmvove

Intuitively, the electron could only be described by two parts, one establishing it's electric part and the other represented by its gravitational charge - also look for the article in previous link, concerning the Weinberg mass equation which predicts a wide range of particles from only the gravitational part. There is a similar relationship that we widely looked at concerning the black hole and conservation of equivalence concerning moving systems - from the following link

https://www.quora.co...ctpkjczfcviwugm

I preserve the laws of electromagnetism and Larmor radiation to the system of a black hole in which we argued it had to hold for a quantum description. More importantly, the relativity of charges had to be preserved also from the well-known black hole relationship

[math]Q + (\frac{J}{m^2}) \leq m^2[/math]

There is no coincidence here concerning the square of the mass in relationship to the black holes total charge, nor any more a coincidence that Regge trajectories works perfectly fine under this description. For other work concerning the importance of this relationship, is found in a wide range of literature, but here is one for example:

https://arxiv.org/abs/1701.07643

The units have to be restored so that it can be understood that the total charge [math]Gm^2[/math] is a contribution of its ordinary electric charge combined in addition with its angular momentum

[math]\hbar c + J c \leq Gm^2 = Q_{total}[/math]

If this relationship holds for fundamental black holes, then it may also hold for a wide range of particles as well.

**Edited by Dubbelosix, 10 August 2019 - 08:57 AM.**