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Article: Scientists at California Institute of Technology publish research in astrophysics.
- Article from:
- Physics Week
- Article date:
- November 10, 2009
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According to a study from the United States, "Recent analyses of the cosmic microwave background (CMB) maps from the WMAP satellite have uncovered evidence for a hemispherical power anomaly, i.e. a dipole modulation of the CMB power spectrum at large angular scales with an amplitude of +/- 14 percent. Erickcek et al. have put forward an inflationary model to explain this anomaly. Their scenario is a variation on the curvaton scenario in which the curvation possesses a large-scale spatial gradient that modulates the amplitude of CMB fluctuations."
"We show that this scenarion would also lead to a spatial gradient in the amplitude of perturbations sigma 8, and ...