CMB cold spot from inflationary feature scattering
We propose a “feature-scattering” mechanism to explain the cosmic microwave background cold spot seen from WMAP and Planck maps. If there are hidden features in the potential of multi-field inflation, the inflationary trajectory can be scattered by such features. The scattering is controlled by the...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Elsevier
2016-05-01
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| Series: | Nuclear Physics B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0550321316300037 |
| _version_ | 1811230737843617792 |
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| author | Yi Wang Yin-Zhe Ma |
| author_facet | Yi Wang Yin-Zhe Ma |
| author_sort | Yi Wang |
| collection | DOAJ |
| description | We propose a “feature-scattering” mechanism to explain the cosmic microwave background cold spot seen from WMAP and Planck maps. If there are hidden features in the potential of multi-field inflation, the inflationary trajectory can be scattered by such features. The scattering is controlled by the amount of isocurvature fluctuations, and thus can be considered as a mechanism to convert isocurvature fluctuations into curvature fluctuations. This mechanism predicts localized cold spots (instead of hot ones) on the CMB. In addition, it may also bridge a connection between the cold spot and a dip on the CMB power spectrum at ℓ∼20. |
| first_indexed | 2024-04-12T10:34:01Z |
| format | Article |
| id | doaj.art-c8b91aec6eac47a0a5609d220cdc1bed |
| institution | Directory Open Access Journal |
| issn | 0550-3213 1873-1562 |
| language | English |
| last_indexed | 2024-04-12T10:34:01Z |
| publishDate | 2016-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Physics B |
| spelling | doaj.art-c8b91aec6eac47a0a5609d220cdc1bed2022-12-22T03:36:47ZengElsevierNuclear Physics B0550-32131873-15622016-05-01906C36738010.1016/j.nuclphysb.2016.03.020CMB cold spot from inflationary feature scatteringYi Wang0Yin-Zhe Ma1Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, PR ChinaSchool of Chemistry and Physics, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban, 4000, South AfricaWe propose a “feature-scattering” mechanism to explain the cosmic microwave background cold spot seen from WMAP and Planck maps. If there are hidden features in the potential of multi-field inflation, the inflationary trajectory can be scattered by such features. The scattering is controlled by the amount of isocurvature fluctuations, and thus can be considered as a mechanism to convert isocurvature fluctuations into curvature fluctuations. This mechanism predicts localized cold spots (instead of hot ones) on the CMB. In addition, it may also bridge a connection between the cold spot and a dip on the CMB power spectrum at ℓ∼20.http://www.sciencedirect.com/science/article/pii/S0550321316300037 |
| spellingShingle | Yi Wang Yin-Zhe Ma CMB cold spot from inflationary feature scattering Nuclear Physics B |
| title | CMB cold spot from inflationary feature scattering |
| title_full | CMB cold spot from inflationary feature scattering |
| title_fullStr | CMB cold spot from inflationary feature scattering |
| title_full_unstemmed | CMB cold spot from inflationary feature scattering |
| title_short | CMB cold spot from inflationary feature scattering |
| title_sort | cmb cold spot from inflationary feature scattering |
| url | http://www.sciencedirect.com/science/article/pii/S0550321316300037 |
| work_keys_str_mv | AT yiwang cmbcoldspotfrominflationaryfeaturescattering AT yinzhema cmbcoldspotfrominflationaryfeaturescattering |