Proceedings of the

See Figure 1.

- The accessible space-time (physical region) is defined by
.
- In the
**coord.**, the metric (eq.4) is singular at and , where the apparent horizon is located. - In the
**coord.**, the metric (eq.6) is Minkowskian for . The / coordinates describe the interior/exterior of the black hole. These two regions are*causally disconnected*. - In the
**coord.**, the metric (eq.8) is singular in the limits and , if . The horizon is located at . It takes a*finite*amount of proper time for all time-like geodesics with to reach the central singularity at , where all the matter is concentrated after the collapse.

**Figure 1:** ** Space-time diagram** of the 2-D black hole.
The light cones are looking upwards everywhere.
The curves denoted by AH and EH are the apparent and event horizons
respectively.

Thu Jun 19 16:06:54 BST 1997