CMB cold spot from inflationary feature scattering

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...

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Main Authors: Yi Wang, Yin-Zhe Ma
Format: Article
Language:English
Published: Elsevier 2016-05-01
Series:Nuclear Physics B
Online Access:http://www.sciencedirect.com/science/article/pii/S0550321316300037
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spelling doaj-c8b91aec6eac47a0a5609d220cdc1bed2020-11-24T23:37:48ZengElsevierNuclear 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
collection DOAJ
language English
format Article
sources DOAJ
author Yi Wang
Yin-Zhe Ma
spellingShingle Yi Wang
Yin-Zhe Ma
CMB cold spot from inflationary feature scattering
Nuclear Physics B
author_facet Yi Wang
Yin-Zhe Ma
author_sort Yi Wang
title CMB cold spot from inflationary feature scattering
title_short 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_sort cmb cold spot from inflationary feature scattering
publisher Elsevier
series Nuclear Physics B
issn 0550-3213
1873-1562
publishDate 2016-05-01
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.
url http://www.sciencedirect.com/science/article/pii/S0550321316300037
work_keys_str_mv AT yiwang cmbcoldspotfrominflationaryfeaturescattering
AT yinzhema cmbcoldspotfrominflationaryfeaturescattering
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