PROPERTIES OF ASYMPTOTICALLY FLAT 2-DIMENSIONAL BLACK-HOLES

We investigate properties of two-dimensional asymptotically flat black holes which arise in both string theory and in scale invariant theori es of gravity. By introducing sources in the field equations we show h ow such objects can arise as the endpoint of gravitational collapse. W e also investigate the thermodynamic and quantum properties, which giv e rise to a fundamental length scale. The 't Hooft prescription for cu tting off eigenmodes of particle wavefunctions is shown to be source d ependent, unlike the four-dimensional case. The relationship between t hese black holes and those considered previously in (1 + 1) dimensions is discussed.