I was doing research on General Relativity and Einstein's field equations and pondered on a device using that would generate [artificial gravity](https://en.wikipedia.org/wiki/Artificial_gravity) without the use of rotational forces. I wondered since energy and mass are basically the same things (as denoted in $E=mc^2$), then couldn't it be $m=E/c^2$, or an equation similar to that one? (I'm sure my sources and my own math were off a bit, hence me asking the minds on here.)