The wave/particles EEPs are very interesting.
Our space is like a perfect membrane. RussT many times called it.
The energy deform its surface so the distance in stright line become shorter. If the wave is in resonance frequency to the structure of this membrane (space-time) it may stay as a standing wave (seiche) a rest mass particle. The deformations above a medium are attracted by the deformations under a medium. That way everything is attracted because all waves consists of the above and under medium deformations.

It is possible if space-time is something substantives (EEPs) and an energy deform it (wave/particle).

The energy has its potential (gravitational deflection) component and its kinetic (movement) component. The gravitational deflection is attractive and kinetic is repulsive. It is not possible to keep a small Black Hole because much stronger kinetic repulsive energy.