Topic
Saskatoon experiment
About: Saskatoon experiment is a research topic. Over the lifetime, 3 publications have been published within this topic receiving 27 citations.
Papers
TL;DR: In this article, temperature anisotropies of the cosmic microwave background (CMB) for several initial power spectra of density perturbations with a built-in scale suggested by recent optical data on the spatial distribution of rich clusters of galaxies are calculated.
Abstract: We calculate temperature anisotropies of the cosmic microwave background (CMB) for several initial power spectra of density perturbations with a built-in scale suggested by recent optical data on the spatial distribution of rich clusters of galaxies. Using cosmological models with different values of spectral index, baryon fraction, Hubble constant and cosmological constant, we compare the calculated radiation power spectrum with the CMB temperature anisotropies measured by the Saskatoon experiment. We show that spectra with a sharp peak at 120 h^{-1} Mpc are in agreement with the Saskatoon data. The combined evidence from cluster and CMB data favours the presence of a peak and a subsequent break in the initial matter power spectrum. Such feature is similar to the prediction of an inflationary model where an inflaton field is evolving through a kink in the potential.
9 citations
TL;DR: In this article, a wide-field Hα image of the north celestial polar region was used to constrain the contribution of irregularities in interstellar free-free emission to the degree-scale anisotropies in the cosmic microwave background detected in recent observations at Saskatoon by the Princeton group.
Abstract: We made a sensitive, wide-field Hα image of the north celestial polar region. Using this image, we constrain the contribution of irregularities in interstellar free-free emission to the degree-scale anisotropies in the cosmic microwave background detected in recent observations at Saskatoon by the Princeton group. The analysis of the Hα image mimics the Saskatoon data analysis: the resulting signal is the strength of irregularities sampled with the Saskatoon beam (i.e., degree-scale) along the 85° declination circle. We found no such irregularities that could be attributed to Hα emission. The implied upper bound on the rms variation in free-free brightness temperature is less than 4.6 μK at 27.5 GHz. The observed cosmic microwave background anisotropies are much larger. Therefore, the contribution of irregularities in interstellar free-free emission to the observed anisotropies is negligible.
1 Apr 2006
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Performance Metrics
| Year | Papers |
|---|---|
| 2006 | 1 |
| 1997 | 1 |
| 1996 | 1 |