Project: G Code

P. Anninos, K. Camarda, R. Gjertsen, J. Jaynes, J. Massó, E. Seidel, A. Shutko, M. Tobias, J. Towns

Abstract

The "G" code is NCSA's "traditional" 3-D numerical general relativity program, using the same intrinsic and extrinsic curvature variables to represent the gravitational field that have been used since the "dawn of time" in numerical relativity a few decades ago. (For a different and more "modern" approach to representing gravitational curvature information numerically, see the Hyperbolic Relativity or H Code project pages.)

Comprising more than 20,000 lines of Fortran 90 code, the G code uses a Cartesian-like coordinate system in three space dimensions to make it possible to study problems without any convenient symmetry properties. The current "production" version is limited to vacuum spacetimes, although a version with bosonic matter added is under development.

Progress Report

Related Projects

The G Code is an integral part of several NCSA research projects, including 3-D Black Holes, 3-D Gravitational Waves, Event Horizons, and Apparent Horizon Boundary Conditions, as well as the 3-D Apparent Horizon Finder. In addition, the maximal (zero mean curvature) slicing option in the G code is implemented using the Elliptic Solvers described under that project.