BETOCS (BayEsian Tools for Observational Cosmology using SNe Ia) is aimed to help
the theoretical physicist community investigate cosmological models
using type Ia supernovae (SNe Ia) observational data.

BETOCS is a freeware and open source tool
written in the Mathematica
language. The Mathematica
notebooks of BETOCS contain documentation, source code and practical
examples with textual and graphical outputs.

Description

Current features of
BETOCS
(v1.20):

- it is very easy to modify the theoretical cosmological model, except some cases which have non-explicit expressions;
- the Bayesian statistics allows to estimate independent parameters and dependent parameters (or functions of the independent parameters);
- graphical output of 3-dimensional, 2-dimensional and 1-dimensional PDFs;
- global maximization of PDF;
- compatible with Mathematica 4 and 5.

Each BETOCS notebook
contains :

- definitions of the theoretical cosmological model;
- reading of the observational SNe Ia data;
- chi^2 definition;
- Bayesian tools library;
- calculation of the Bayesian PDF;
- global maximization of PDF;
- PDF visualization in 3 dimensions (if available);
- PDF visualization and analysis in 2 dimensions;
- PDF visualization in 1 dimension with (independent
and dependent) parameter estimation.

Download

How to cite BETOCS

Pratical uses of BETOCS : articles, etc

- BETOCS v1.2 with 4 independent parameters for LambdaCDM. Uses the 182 "Gold" SNe Ia dataset (Riess et al). Part of the updated ref. [2] analyses. Developed and calculated by R. Colistete Jr. and R. Giostri. Mathematica 5 version (ZIP file with 2.7 MB).
- BETOCS v1.0 with 3 independent parameters for LambdaCDM, with no priors and no marginalization for the Hubble parameter. Uses the 157 "Gold" SNe Ia dataset (Riess et al). Part of the ref. [2] analyses. Developed by R. Colistete Jr., calculation made by R. Colistete Jr. and R. Giostri. Mathematica 4 version (ZIP file with 2.3 MB), Mathematica 5 version (ZIP file with 2.2 MB).
- BETOCS v1.0 with 4 independent parameters for the Chaplygin Gas Model, with no priors and no marginalization for the Hubble parameter. Uses the 157 "Gold" SNe Ia dataset (Riess et al). Part of the ref. [2] analyses. Developed by R. Colistete Jr., calculation made by R. Colistete Jr. and R. Giostri. Mathematica 4 version (ZIP file with 2.9 MB), Mathematica 5 version (ZIP file with 2.6 MB).
- SNe Ia data file (13 KB) for the 292 SNe Ia dataset including the 182 "Gold" dataset (Riess et al)
- SNe Ia data file (4 KB) for the 157 "Gold" SNe Ia dataset (Riess et al)

How to cite BETOCS

If you use BETOCS in your article, thesis, etc, please cite the BETOCS project :

or in TeX format :

"R. Colistete Jr. and R. Giostri, BayEsian Tools for Observational Cosmology using SNe Ia (BETOCS), available on the Internet site http://www.RobertoColistete.net/BETOCS, (2007)"

or in TeX format :

"\bibitem{betocs} R. Colistete Jr. and R. Giostri, \textit{\textbf{B}ay\textbf{E}sian
\textbf{T}ools for \textbf{O}bservational \textbf{C}osmology using
\textbf{S}Ne Ia (\textbf{BETOCS})}, available on the Internet site
http://www.RobertoColistete.net/BETOCS, (2007)".

You can also cite some of my articles (they are listed below among
other articles) which detail the use of BETOCS applied to some
cosmological models (LambdaCDM, Chaplygin Gas Model, etc).

I would be very grateful if you send us a email telling that you have
used BETOCS in your work, with your opinion, suggestion of new
features, etc. This feedback is important for future releases of BETOCS.

Pratical uses of BETOCS : articles, etc

- R. Colistete Jr., J.C. Fabris, J. Tossa and W. Zimdahl, "Bulk Viscous Cosmology", Phys. Rev. D76, 103516 (2007), arXiv:0706.4086;
- E. E. O. Ishida, R. R. R. Reis, A. V. Toribio, I. Waga, "When did cosmic acceleration start ? How fast was the transition?", Astroparticle Physics 28, 547 (2008), arXiv:0706.0546;
- R. Colistete Jr. and R. Giostri, "BETOCS using the 157 gold SNe Ia Data : Hubble is not humble", astro-ph/0610916;
- F. Casarejos, J. C. Fabris, S. V. B. Gonçalves and J. F. Villas da Rocha, "Constraining double component dark energy model using type Ia supernovae data", astro-ph/0606171;
- R. Colistete Jr. and J. C. Fabris, "Bayesian Analysis of the (Generalized) Chaplygin Gas and Cosmological Constant Models using the 157 gold SNe Ia Data", Class. Quantum Grav. 22, 2813 (2005), astro-ph/0501519;
- R. Colistete Jr., J. C. Fabris and S. V. B. Gonçalves, "Bayesian Statistics and Parameter Constraints on the Generalized Chaplygin Gas Model using SNe Ia Data", Int. J. Mod. Phys. D14, 775 (2005), astro-ph/0409245;
- R. Colistete Jr., J. C. Fabris, S. V. B. Gonçalves and P. E. de Souza, "Bayesian Analysis of the Chaplygin Gas and Cosmological Constant Models using the SNe Ia Data", Int. J. Mod. Phys. D13, 669 (2004), astro-ph/0303338.

Screenshots

Acknowledgements

Acknowledgements

- Many thanks to members of the Gravitation and Cosmology Group (Grupo de Cosmologia e Gravitação - GCG) of the Federal University of Espírito Santo (Universidade Federal do Espírito Santo - UFES), as I have learned a lot of observational cosmology from them since 2002;
- I would like to thank the support from the Physics Department (Departamento de Física) and Post-Graduation in Physics (Pós-Graduação em Física) of the Federal University of Espírito Santo (Universidade Federal do Espírito Santo - UFES);
- Thanks to the financial support from FACITEC-PMV and PRONEX 2006 (FAPES/CNPq).

About BETOCS

BETOCS version 1.20 for Mathematica v4/5.Copyright © 2006-7 Roberto Colistete Jr & Ramón Giostri.

BETOCS is a freeware and open source software. It is supplied as is and comes with no warranty. The author accepts no liability for any data that may be lost using this program.

For questions, suggestions and comments, please use the form :