Non-Gaussianity and the Cosmic Microwave Background Anisotropies
We review in a pedagogical way the present status of the impact of non-Gaussianity (NG) on the cosmic microwave background (CMB) anisotropies. We first show how to set the initial conditions at second order for the CMB anisotropies when some primordial NG is present. However, there are many sources...
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| Format: | Article |
| Language: | English |
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Wiley
2010-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2010/157079 |
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| author | N. Bartolo S. Matarrese A. Riotto |
| author_facet | N. Bartolo S. Matarrese A. Riotto |
| author_sort | N. Bartolo |
| collection | DOAJ |
| description | We review in a pedagogical way the present status of the impact of non-Gaussianity (NG) on the cosmic
microwave background (CMB) anisotropies. We first show how to set the initial conditions at second order for the CMB anisotropies when some primordial NG is present. However, there are many sources of NG in CMB anisotropies, beyond the primordial one, which can contaminate the primordial signal. We mainly focus on the NG generated from the post inflationary evolution of the CMB anisotropies at second order in perturbation theory at large and small angular scales, such as the ones generated at the recombination epoch. We show how to derive the equations to study the second-order CMB anisotropies and provide analytical computations to evaluate their contamination to primordial NG (complemented with numerical examples). We also offer a brief summary of other secondary effects. This paper requires basic knowledge of the theory of cosmological perturbations at the linear level. |
| format | Article |
| id | doaj-art-9e961b36b7784e4abe3f30a883e18fad |
| institution | Kabale University |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2010-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-9e961b36b7784e4abe3f30a883e18fad2025-02-03T05:59:08ZengWileyAdvances in Astronomy1687-79691687-79772010-01-01201010.1155/2010/157079157079Non-Gaussianity and the Cosmic Microwave Background AnisotropiesN. Bartolo0S. Matarrese1A. Riotto2Dipartimento di Fisica “G. Galilei”, Università di Padova, via Marzolo 8, 131 Padova, ItalyDipartimento di Fisica “G. Galilei”, Università di Padova, via Marzolo 8, 131 Padova, ItalyINFN, Sezione di Padova, via Marzolo 8, 35131 Padova, ItalyWe review in a pedagogical way the present status of the impact of non-Gaussianity (NG) on the cosmic microwave background (CMB) anisotropies. We first show how to set the initial conditions at second order for the CMB anisotropies when some primordial NG is present. However, there are many sources of NG in CMB anisotropies, beyond the primordial one, which can contaminate the primordial signal. We mainly focus on the NG generated from the post inflationary evolution of the CMB anisotropies at second order in perturbation theory at large and small angular scales, such as the ones generated at the recombination epoch. We show how to derive the equations to study the second-order CMB anisotropies and provide analytical computations to evaluate their contamination to primordial NG (complemented with numerical examples). We also offer a brief summary of other secondary effects. This paper requires basic knowledge of the theory of cosmological perturbations at the linear level.http://dx.doi.org/10.1155/2010/157079 |
| spellingShingle | N. Bartolo S. Matarrese A. Riotto Non-Gaussianity and the Cosmic Microwave Background Anisotropies Advances in Astronomy |
| title | Non-Gaussianity and the Cosmic Microwave Background Anisotropies |
| title_full | Non-Gaussianity and the Cosmic Microwave Background Anisotropies |
| title_fullStr | Non-Gaussianity and the Cosmic Microwave Background Anisotropies |
| title_full_unstemmed | Non-Gaussianity and the Cosmic Microwave Background Anisotropies |
| title_short | Non-Gaussianity and the Cosmic Microwave Background Anisotropies |
| title_sort | non gaussianity and the cosmic microwave background anisotropies |
| url | http://dx.doi.org/10.1155/2010/157079 |
| work_keys_str_mv | AT nbartolo nongaussianityandthecosmicmicrowavebackgroundanisotropies AT smatarrese nongaussianityandthecosmicmicrowavebackgroundanisotropies AT ariotto nongaussianityandthecosmicmicrowavebackgroundanisotropies |