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.
Abstracts are powerful 'short stories' that are used in journal articles and conference presentations. An abstract will help reviewers to decide whether to accept your paper, conference abstract or grant application, and help readers to decide whether to read your paper or attend your presentation. Often people will read only the abstract of a paper (even if they cite it), so it is crucial that your abstract gets your message across. Thus, when it comes to writing abstracts, it is worth the effort to do this well. This Getting Started Guide provides tips and information to assist you with this exercise.
It typically takes several days to write a good abstract, and the process should not be undertaken alone. Get help from a mentor who is not familiar with the case; such mentors can quickly point out areas that are unclear or demand more detail. Make revisions based upon the feedback. Finally, have others read your draft in order to check for technical errors, such as spelling and grammar mistakes. Reading the abstract out loud is another good way to catch awkward phrasing and word omissions. Finally, a Clinical Vignette Abstract Checklist and an example of a clinical vignette abstract are available to help you with the process of writing a successful abstract.