Radial BAO size method and Hubble parameter

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SUMMARY

The radial BAO (Baryon Acoustic Oscillations) size method is utilized to derive the Hubble parameter H(z) by analyzing the correlation peaks in the galaxy distribution spectrum. Researchers, such as Zhang et al. in their paper "Constraints on the Dark Side of the Universe and Observational Hubble Parameter Data," employ a fiducial expansion rate from a basic model and adjust it based on comparisons with Cosmic Microwave Background (CMB) measurements. The process involves determining the redshift and calculating the expansion rate parameter, denoted as adot/a, to establish the relationship between distance and redshift.

PREREQUISITES
  • Understanding of Baryon Acoustic Oscillations (BAO)
  • Familiarity with redshift measurements in cosmology
  • Knowledge of Cosmic Microwave Background (CMB) data analysis
  • Basic principles of cosmological expansion rates
NEXT STEPS
  • Study the methodology of Baryon Acoustic Oscillations in cosmology
  • Learn about the calculation of the Hubble parameter H(z) using observational data
  • Examine the implications of the fiducial expansion rate in cosmological models
  • Review the paper "Constraints on the Dark Side of the Universe and Observational Hubble Parameter Data" by Zhang et al. for detailed insights
USEFUL FOR

Astronomers, cosmologists, and researchers interested in the measurement of cosmic expansion and the analysis of dark energy through observational data.

shadishacker
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Hi!

Can anyone tell me what the radial BAO size method is?
how do people use it to get to the H(z)?
I am reading the paper "Constraints on the Dark Side of the Universe and Observational Hubble Parameter Data " by Zhang et al. and I think I am lost!
Can anyone tell me very simple, how they do it?
-So they get the spectrum, find the redshift, and then look for adot/a ?
-How do they find adot?
 
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It's described here, and unfortunately it isn't terribly simple:
https://arxiv.org/abs/0807.3551

The description is in section 4, page 14.

Basically, they take the "fiducial" expansion rate from a simple expansion model, and then correct it by comparing the observed correlation peak and compare it with the peak as measured from the CMB.
 

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