Beschreibung:
<jats:p>The gravitational deflection of relativistic particles and of light is discussed from a simple point of view, in terms of velocity-dependent forces in flat space. This picture is shown to be equivalent to that of general relativity, and some of its metric extensions, in the limit of weak gravitational effects. The deflection can then be predicted, up to one free parameter. The relation of that parameter to the spin of gravitational radiation is considered, giving a simple discussion of the known connection between general relativity and a theory with spin-two fields.</jats:p>