Small Angular Scale CMB Anisotropies: Early Universe or Local structures ?
Abstract
The advent of high resolution cosmic microwave background (CMB) experiments now allow studies on the temperature fluctuations at small angular scales corresponding to few arcminutes. At these angular scales, temperature anisotropies are generated by effects related to the local universe, through effects such as scattering of CMB photons via free electrons. Another strong possibility for anisotropies at these scales involve non-standard aspects of inflationary models. To distinguish between contributions from early universe and local structures and to understand the extent to which structures at low redshifts contribute to small scale temperature anisotropies, it may be necessary to perform a combined study involving CMB and the large scale structure. We suggest a cross-correlation of the temperature data with a map of the large scale structure, such as the galaxy distribution. For next generation small angular scale CMB experiments, multi-frequency observations may be a necessary aspect to allow an additional possibility to distinguish between these different scenarios.Keywords
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