Sometimes students think that this discussion of types of language is about vocabulary, but it's not. You don't need a fancy vocabulary to come up with bent spoon or limping dog or Mary told Margaret she hates me . It's not about imagination, either. If you have reached any kind of a reasoned conclusion, you must have had or read about or heard about relevant experiences. Finding concrete specifics doesn't require a big vocabulary or a vivid imagination, just the willingness to recall what you already know. If you really can't find any examples or specifics to support your general conclusion, chances are you don't really know what you're talking about (and we are all guilty of that more than we care to admit).
The problem of detecting gravitational radiation is receiving considerable attention with the construction of new detectors in the United States, Europe, and Japan. The theoretical modeling of the wave forms that would be produced in particular systems will expedite the search for and analysis of detected signals. The characteristic formulation of GR is implemented to obtain an algorithm capable of evolving black holes in 3D asymptotically flat spacetimes. Using compactification techniques, future null infinity is included in the evolved region, which enables the unambiguous calculation of the radiation produced by some compact source. A module to calculate the waveforms is constructed and included in the evolution algorithm. This code is shown to be second-order convergent and to handle highly non-linear spacetimes. In particular, we have shown that the code can handle spacetimes whose radiation is equivalent to a galaxy converting its whole mass into gravitational radiation in one second. We further use the characteristic formulation to treat the region close to the singularity in black hole spacetimes. The code carefully excises a region surrounding the singularity and accurately evolves generic black hole spacetimes with apparently unlimited stability.