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

The 1998 discovery of the cosmic acceleration with supernovae was recently awarded the 2011 Nobel Prize in Physics.  More observations continue to support this accelerated expansion of the universe (cosmic acceleration).   The EJS "Fitting Cosmological Data Compilation" model includes several cosmological surveys for five different observations of the expansion, all of which support a cosmic acceleration. The simulation allows users to compare and fit theoretical models of cosmology with recent supernovae, gamma-ray bursts, the Hubble Parameter, baryon acoustic oscillations, and the CMB data sets to confirm the accelerated expansion of the universe. This modeling allows the user to vary cosmological parameters within a particular class of dark energy cosmological models to fit a particular cosmological data set.  The user can plot several theoretical curves with the data to compare different models.  The values of these parameters, for a particular model, determine the physical description and evolution of the universe.

The EJS "Fitting Cosmological Data Compilation" 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_Data_Compilation.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_FittingCosmologicalDataDEDGP.jar - 2983kb Java Archive File

Published August 27, 2012
Last Modified August 17, 2017

This file has previous versions.

Table of Observational Surveys we include for CosmoEJS. We list the Observational Survey Name (Type), Number in Survey, Redshift (z) Range, Description of the Survey, Parameters To Fit, Filename, Format of the data sets.

• Download EJSCosmology_DataTable.pdf - 162kb Adobe PDF Document

Last Modified August 27, 2012

Description of features and buttons CosmoEJS.

• Download EJSCosmology_Features.pdf - 134kb Adobe PDF Document

Last Modified August 27, 2012

Here we give the details of observations and theoretical background included in CosmoEJS. We include recent supernovae (SNe) Type Ia surveys, gamma-ray bursts (GRB), the Hubble expansion rate parameter H(z), baryon acoustic oscillations (BAO), and the surface of the last scatttering of the cosmic microwave background (CMB) radiation.

• Download EJSCosmology_Observations.pdf - 281kb Adobe PDF Document

Last Modified August 27, 2012

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

• Download ejs_src_FittingCosmologicalDataDEDGP.zip - 172kb Compressed File

Last Modified August 17, 2017

This file has previous versions.