written by Jacob Moldenhauer, Keenan Stone, Zeke Shuler, Larry Engelhardt, Francis Cavanna, William O'Toole, and William Zimmerman

The EJS Fitting Cosmological Data Launcher package includes several cosmological fitting simulations for five different observations of the expansion, all of which support a cosmic acceleration. The launcher allows users to choose which simulation to use 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 Launcher package was created using Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_CosmoEJS.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_CosmoEJSDEDGP.jar - 4842kb Java Archive File

Published September 9, 2012
Last Modified August 17, 2017

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A lab for fitting simulated theoretical cosmological models with real observational data sets from recent astronomical surveys using the package CosmoEJS.

• Download CosmoEJS Lab.pdf - 907kb Adobe PDF Document

Last Modified August 8, 2018

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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 - 273kb Adobe PDF Document

Last Modified December 19, 2012

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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 - 163kb Adobe PDF Document

Last Modified December 19, 2012

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Description of features and buttons CosmoEJS.

• Download EJSCosmology_Features.pdf - 134kb Adobe PDF Document

Last Modified December 19, 2012

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The multi-model source code zip archive contains EJS-XML representations of six cosmological data fitting models.   Unzip this archive in your EJS workspace to compile and run these model using EJS.

• Download ejs_src_CosmoEJSDEDGP.zip - 432kb Compressed File

Last Modified August 17, 2017

This file has previous versions.