Program for Supernova Data Fitting

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Discussion Overview

The discussion centers around the search for programs that can fit Supernova data to constrain parameters of cosmological models. The scope includes theoretical applications and practical software tools used in astrophysics.

Discussion Character

  • Technical explanation, Experimental/applied, Debate/contested

Main Points Raised

  • One participant inquires about programs suitable for fitting Supernova data to cosmological models.
  • Another participant suggests COSMOMC as a commonly used tool, noting its lack of user-friendliness.
  • A different approach is proposed involving the use of spreadsheets like Excel to derive {z,Dm} pairs from {z,M} points, along with a mathematical relationship for Dm.
  • There is a reiteration of the suggestion to use COSMOMC, with an acknowledgment of its name by another participant.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a single program or method, as multiple approaches and tools are discussed without agreement on their effectiveness or usability.

Contextual Notes

Some assumptions about the mathematical relationships and software capabilities are not fully explored, and the discussion does not resolve the complexities involved in fitting the data.

Who May Find This Useful

Researchers and students interested in cosmology, data fitting techniques, and software applications for astrophysical data analysis may find this discussion relevant.

micomaco86572
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Are there any programs which could be used to fit the Supernova data to constrain the cosmological models's parameter? thx
 
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micomaco86572 said:
Are there any programs which could be used to fit the Supernova data to constrain the cosmological models's parameter? thx
Well, sort of. Many physicists use COSMOMC for this kind of work. It isn't, however, very user-friendly.
 
You can drop the {z,M} points into a spread sheet like Excel and take Dm = (10^(M/5))/(1+z) to get {z,Dm} pairs, which are well-behaved (Dm approx az - bz²). You'll need some integrating software to compare the LCDM model which predicts that "a" is proportional to sinh(qt) where q is a constant that depends on the parameters. Then Dm is proportional to the time integral of (1/a)dt. The limits are from the time tz where a(tz) = 1/(1+z) to the present time t0 (which is fixed).
 
Chalnoth said:
Well, sort of. Many physicists use COSMOMC for this kind of work. It isn't, however, very user-friendly.
thank u Chalnoth. I have heard about this program, but I forgot the name.
 

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