Chinese Physics C > 2016, Vol. 40 > Issue(7): 075101 DOI: 10.1088/1674-1137/40/7/075101

Large angular scale CMB anisotropy from an excited initial mode

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Abstract：
According to inflationary cosmology, the CMB anisotropy gives an opportunity to test predictions of new physics hypotheses. The initial state of quantum fluctuations is one of the important options at high energy scale, as it can affect observables such as the CMB power spectrum. In this study a quasi-de Sitter inflationary background with approximate de Sitter mode function built over the Bunch-Davies mode is applied to investigate the scale-dependency of the CMB anisotropy. The recent Planck constraint on spectral index motivated us to examine the effect of a new excited mode function (instead of pure de Sitter mode) on the CMB anisotropy at large angular scales. In so doing, it is found that the angular scale-invariance in the CMB temperature fluctuations is broken and in the limit l<200 a tiny deviation appears. Also, it is shown that the power spectrum of CMB anisotropy is dependent on a free parameter with mass dimension H<< M _*< M _pand on the slow-roll parameter ε.
- initial state,
- power spectrum,
- CMB anisotropy

References

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A. Sojasi, M. Mohsenzadeh and E. Yusofi. Large angular scale CMB anisotropy from an excited initial mode[J]. Chinese Physics C, 2016, 40(7): 075101. doi: 10.1088/1674-1137/40/7/075101

A. Sojasi, M. Mohsenzadeh and E. Yusofi. Large angular scale CMB anisotropy from an excited initial mode[J]. Chinese Physics C, 2016, 40(7): 075101. doi:10.1088/1674-1137/40/7/075101 shu

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Received: 2015-12-22
Revised: 2015-03-01

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Supported by the Islamic Azad University, Rasht Branch, Rasht, Iran

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Large angular scale CMB anisotropy from an excited initial mode

Corresponding author:A. Sojasi,

Corresponding author:M. Mohsenzadeh,

Corresponding author:E. Yusofi,

Received Date:2015-12-22

Accepted Date:2015-03-01

Available Online:2016-07-05

Fund Project:Supported by the Islamic Azad University, Rasht Branch, Rasht, Iran

Abstract:According to inflationary cosmology, the CMB anisotropy gives an opportunity to test predictions of new physics hypotheses. The initial state of quantum fluctuations is one of the important options at high energy scale, as it can affect observables such as the CMB power spectrum. In this study a quasi-de Sitter inflationary background with approximate de Sitter mode function built over the Bunch-Davies mode is applied to investigate the scale-dependency of the CMB anisotropy. The recent Planck constraint on spectral index motivated us to examine the effect of a new excited mode function (instead of pure de Sitter mode) on the CMB anisotropy at large angular scales. In so doing, it is found that the angular scale-invariance in the CMB temperature fluctuations is broken and in the limitl<200 a tiny deviation appears. Also, it is shown that the power spectrum of CMB anisotropy is dependent on a free parameter with mass dimensionH<<M_*<M_pand on the slow-roll parameterε.

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Large angular scale CMB anisotropy from an excited initial mode

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