Gravity
This model proposes that gravity is an effect created by the apsorption and emission of fotons - not a distinct fundamental force.
Gravitational force is the consequence of absorptiona and emission of fotons. Each time a foton is emitted, a fraction of its energy contributes to changing the path of the matino (or body of matinos) so that it maintains its orbit around the other matino (or body of matinos).
Between emissions, matinos or their host bodies, travel in a straight line. The cumulative effect of emissions is orbital motion. In bodies with large numbers of matinos, each section of straight line motion is immeasurably small.