Accepted value for Omega of radiation energy density

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SUMMARY

The currently accepted value for Omega of radiation energy density, which includes contributions from photons and neutrinos, is derived from the WMAP team's cosmological parameter analysis as presented by Spergel et al. This analysis provides the most authoritative estimates for neutrino Omega and mass Omega, enabling the calculation of photon Omega. For further details, resources such as Hyperphysics and specific Cornell University course materials offer concise overviews of these concepts.

PREREQUISITES
  • Understanding of cosmological parameters
  • Familiarity with WMAP (Wilkinson Microwave Anisotropy Probe) data
  • Knowledge of radiation energy density concepts
  • Basic grasp of neutrino physics
NEXT STEPS
  • Review the WMAP team's cosmological parameter analysis by Spergel et al.
  • Study the relationship between neutrino mass and radiation energy density
  • Explore the Hyperphysics page on radiation energy density
  • Calculate photon Omega using mass Omega estimates
USEFUL FOR

Astronomers, astrophysicists, and students studying cosmology or radiation physics will benefit from this discussion.

hellfire
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What is the currently accepted value for Omega of radiation energy density (photons and neutrinos)? References would be helpful. Thanks.
 
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units, ugh!

This Hyperphysics page has an overview of the concepts and relationships. http://instruct1.cit.cornell.edu/courses/astro101/lec31.htm gives some information in bite-sized bullets. Spergel et al present the WMAP team's cosmological parameter analysis and results; this has perhaps the most up-to-date, authoratitive estimate of the neutrino omega, as well as the mass omega. From the latter it should be easy to calculate an estimate of the photon omega.
 
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