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Predictions of mixed non-Gaussian cosmological density fields for the cosmic microwave background radiation | | Ana Paula Andrade
; Carlos Alexandre Wuensche
; Andre Luiz B. Ribeiro
; | | Date: |
1 Dec 2003 | | Journal: | Astrophys.J. 602 (2004) 555-564 | | Subject: | astro-ph | | Affiliation: | INPE, Brasil), Carlos Alexandre Wuensche (INPE, Brasil), Andre Luiz B. Ribeiro (UESC, Brasil | | Abstract: | We present simulations of the Cosmic Microwave Background Radiation (CMBR) power spectrum for a class of mixed, non-Gaussian, primordial random fields. We assume a skew positive mixed model with adiabatic inflation perturbations plus additional isocurvature perturbations possibly produced by topological defects. The joint probability distribution used in this context is a weighted combination of Gaussian and non-Gaussian random fields, such as: P(delta) = (1-alpha)f_{1}(delta) + alpha*f_{2}(delta), where f_{1}(delta) is a Gaussian distribution, f_{2}(delta) is a non-Gaussian general distribution, and alpha is a scale dependent mixture parameter. Results from simulations of CMBR temperature and polarisation power spectra show a distinct signature for very small deviations (~ 0.1%) from a pure Gaussian field. We discuss the main properties of such mixed models as well, their predictions and suggestions on how to apply them to small scale CMBR observations. A reduced chi^2 test shows that the contribution of an isocurvature fluctuation field is not ruled out in actual CMB observations, even in WMAP first-year sky map. | | Source: | arXiv, astro-ph/0312028 | | Services: | Forum | Review | PDF | Favorites | |
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