# Holographic principle

1. Jan 1, 2006

### touqra

If the entropy, S of a black hole is proportional to the area of the horizon, A, then, what about an observer moving with a constant velocity, v with the BH? Another observer moving with a constant acceleration with respect to the BH?
After all, entropy is an invariant but area is not. So, isn't this a problem?

2. Jan 4, 2006