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doles.ppt - Fermilab

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									A Computer Program to Model The
Universe Surveyed by SNAP


       Duane T. Doles, SIST Intern
      Dr. Albert Stebbins, Supervisor


                             SIST 2004
                       Background

   Background
                          Fermilab
   Theory                 •   Tevatron
                           •   Standard Model

   Procedure             Dark Energy
                           •   Beyond Standard Model
   Results &              •   Energy in Empty Space

    Discussion
                          SNAP
                           •   Int’l Mission to Study Dark Energy
   Acknowledgements       •   Characterize equation of state, density,
                               time variation using dist-redshift

   Questions
                       Theory

   Background
                          Supernova
   Theory                 •   Massive Star -> Explodes
                           •   Type Ia: Uniform Luminosity

   Procedure             Redshift
                           •   Rel. Motion Light Object and Observer
   Results &              •   Light Wavelength Shifted towards Red

    Discussion
                          Cosmological
   Acknowledgements       Principle
                           •   Study Inhomogeneity in Early Universe
                           •   Einstein: (1) homogeneous--no lumps
   Questions                  (2) isotropic--same all directions
                                  Procedure
                       •   Create 3-D Matrix of Random Numbers
   Background
                       •   Fourier Transform & Inverse Fourier
   Theory                 Transform

   Procedure
                       •   Copy Matrix to another Matrix in
                           memory
   Results &
    Discussion
                       •   Write Resultant Matrix to FITS file
   Acknowledgements
                       •   Validate FITS file with fv software tool
   Questions
                       •   Modify HugeFFT to WriteSubImg
                       Results & Discussion

   Background
                              Success:
   Theory                     •   FITS file
                               •   Cube of FITS file
   Procedure
                              Performance:
                               •   Memory
   Results &
                               •   Running Time
    Discussion

   Acknowledgements

   Questions
                       Acknowledgements

   Background            Dr. Albert Stebbins

                          Huan Lin
   Theory
                          Summer Interns
   Procedure
                          Mentors
   Results &
    Discussion            C-USER@listserv.fnal.gov

   Acknowledgements      Dr. William D. Pence, NASA’s
                           HEASARC: Software

   Questions             Dr. Davenport

                          SIST Program Staff
                       Questions

   Background

   Theory

   Procedure

   Results &
    Discussion

   Acknowledgements

   Questions

								
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