Computer simulations are a powerful and important tool for understanding the cosmos. A detailed simulation can provide a means for understanding processes which occur on such long time scales (millions or even billions of years) that it is not possible to to observe these events in the universe. Cosmological simulations are used to study galaxy collisions and also the formation of large scale structure in the universe. The introductory lesson below assumes no prior background in astronomy. The advanced lesson requires experience in building computer programs from source code.
Note: The Galaxy Crash applet is no longer available online. See this link to download the code: http://burro.case.edu/JavaLab/
|Galaxy Crash lesson|
Run the Galaxy Crash applet and try the suggestions in the Lab section.
Another online simulation is available at Colliding Galaxies
GADGET was developed from 2000-2005 to run cosmological simulations on massively parallel computers with distributed memory. This older software was selected for this resource due to the fact that the example programs can now be run on a typical personal computer.
- GADGET-2: A code for cosmological simulations of structure formation - Simulation code for galaxy collisions or for early structure formation in the universe.
- SWIFT: SPH With Inter-dependent Fine-grained Tasking - Simulation code for galaxy collisions or for early structure formation in the universe, a drop-in replacement of GADGET-2.
- Starscream: A GPL code for galactic astronomy - Used to generate initial conditions to use with GADGET for galaxy collision simulations.
- cuda-gadget - "A modified version of GADGET-2 (Springel 2005) that computes tree forces on GPUs using the CUDA programming interface. Based on G2X by Carsten Frigaard." Version of GADGET-2 for w:GPU hardware.
- IFrIT: A general purpose visualization software - For viewing the results of simulations.
- Data Files and Public Movies from CAST (Computational Astrophysics) group.
- Haroz, Steve; Heitmann, Katrin (Sept.-Oct. 2008). "Seeing the Difference between Cosmological Simulations". IEEE Computer Graphics and Applications 28 (5): 37-45. doi:10.1109/MCG.2008.101. "Visualizing the time-variant results of a simulation can help scientists see patterns that would be difficult to find using only statistics. Furthermore, visualizing the differences between multiple simulations can let scientists directly analyze the simulations' consistency. In this article, we describe our interactive application for viewing the differences between multiple time-variant cosmological simulations."
- Springel, Volker (21 December 2005). "The cosmological simulation code GADGET-2". Monthly Notices of the Royal Astronomical Society 364 (4): 1105–1134. doi:10.1111/j.1365-2966.2005.09655.x. http://www.mpa-garching.mpg.de/gadget/gadget2-paper.pdf. Retrieved January 21, 2018. "The main reference for the implemented physics, and for algorithmic and numerical aspects of GADGET-2."
- Springel, Volker; Yoshida, Naoki; White, Simon D.M. (April 2001). "GADGET: a code for collisionless and gasdynamical cosmological simulations". New Astronomy 6 (2): 79–117. doi:10.1016/S1384-1076(01)00042-2. http://www.mpa-garching.mpg.de/gadget/gadget1-paper.pdf. Retrieved January 21, 2018. "Additional information about the previous version of GADGET."