# Item

ITEM ACTIONSEXPORT

Released

Journal Article

#### The close limit from a null point of view: The advanced solution

##### Fulltext (public)

3365.pdf

(Preprint), 566KB

##### Supplementary Material (public)

There is no public supplementary material available

##### Citation

Campanelli, M., Gomez, R., Husa, S., Winicour, J., & Zlochower, Y. (2001). The
close limit from a null point of view: The advanced solution.* Physical Review D,* *63*(12): 124013.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-5591-F

##### Abstract

We present a characteristic algorithm for computing the perturbation of a Schwarzschild spacetime by means of solving the Teukolsky equation. We implement the algorithm as a characteristic evolution code and apply it to compute the advanced solution to a black hole collision in the close approximation. The code successfully tracks the initial burst and quasinormal decay of a black hole perturbation through 10 orders of magnitude and tracks the final power law decay through an additional 6 orders of magnitude. Determination of the advanced solution, in which ingoing radiation is absorbed by the black hole but no outgoing radiation is emitted, is the first stage of a two stage approach to determining the retarded solution, which provides the close approximation waveform with the physically appropriate boundary condition of no ingoing radiation.