written by Jacob Moldenhauer, Keenan Stone, Zeke Shuler, and Larry Engelhardt

Supernovae Type Ia are used as standard candles to directly probe the expansion rate of the universe. The discovery of the cosmic acceleration in 1998 by two independent teams was awarded the 2011 Nobel Prize in Physics. Recently, Gamma-Ray Bursts have been proposed to be a conplementary probe to Supernovae Type Ia. So far, GRBs are the most intense esposions in our universe. For this reason, the GRBs have much higher redshifts up to 8.1, but redshifts close to 10 or larger are expected. This simulation allows the user to discover the cosmological model that best-fits the recent supernovae and GRB datasets. As a default, the cosmological model will be the Lambda Cold Dark Matter (LCDM) model. There are options to modify the model either by modifying the parameters values or number and type of parameters used.   This simulation allows testing of the commonly accepted models of the universe with observations of supernovae Type Ia and derive the values of parameters for the standard model in cosmology. The simulation assumes some basic understanding of cosmology. Specifically, the evolution of the universe can be explained using general relativity and the the universe is homogeneous and isotropic on the large scales, so the equations of motion will be the Friedmann equations.

The  Fitting Supernovae and Gamma Ray Bursts Data Model was created using Easy Java Simulations (EJS) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double clicking the ejs_Fitting_Cosmological_Models_Supernovae.jar file will run the program if Java is installed.  You can modify this simulation if you have EJS by right-clicking within the plot and selecting "Open Ejs Model" from the pop-up menu item.

• Download ejs_model_FittingCosmologicalDataGRBDEDGP.jar - 2474kb Java Archive File

Published August 11, 2012
Last Modified August 17, 2017

This file has previous versions.

The Gamma Ray Burst Data Model allows the user to test a cosmological model with different data sets.

• Download ejs_FittingCosmologicalDataGRB.jar - 1499kb Java Archive File

Last Modified November 18, 2012

This file has previous versions.

The source code zip archive contains an XML representation of the Fitting Supernovae and Gamma Ray Bursts Data Model.  Unzip this archive in your EJS workspace to compile and run this model using EJS.

• Download ejs_src_FittingCosmologicalDataGRBDEDGP.zip - 134kb Compressed File

Last Modified August 17, 2017

This file has previous versions.

The source code zip archive contains an EJS-XML representation of the Gamma Ray Burst Data Model.   Unzip this archive in your EJS workspace to compile and run this model using EJS.

• Download ejs_FittingCosmologicalDataGRB.zip - 34kb Compressed File

Last Modified November 18, 2012

This file has previous versions.