Asymptotic-de sitter inflation in the light of the planck data

Ata Sojasi; Ebrahim Yusofi; Majid Mohsenzadeh

doi:10.1088/1674-1137/42/11/115102

Chinese Physics C> 2018, Vol. 42> Issue(11) : 115102 DOI: 10.1088/1674-1137/42/11/115102

Asymptotic-de sitter inflation in the light of the planck data

1.
Department of physics, Rasht Branch, Islamic Azad University, Rasht, Iran
2.
Department of Physics, Ayatollah Amoli Branch, Islamic Azad University, Amol, Mazandaran, Iran
3.
Department of Physics, Qom Branch, Islamic Azad University, Qom, Iran

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Abstract：
Planck 2015 data, emphasize that the background geometry during inflation is not pure de Sitter, but from the slow variation of Hubble parameter during the inflationary era, it can be quasi-de Sitter. This motivates us to consider an Asymptotic-de Sitter mode function for reconstructing of initial mode and primordial power spectrum of curvature perturbation. Using Markov Chain Monte Carlo (MCMC) method together with applying recent observational constraints from the Cosmic Microwave Background (CMB) data for the parameterized asymptotic initial mode in term of c, show some deviation from Bunch-Davies mode (c=1). Based on Planck 2015 data release the amplitude of scalar perturbations in 68% confidence level is 10⁹ A_s=2.94_-0.42^+0.42 and deviation from Bunch-Davies mode is~0.05, i.e. c~1.05. In this parametrization, the CMB power spectrum of our model shows more red-tilt in comparison with ∧CDM model. Furthermore, we found upper limits for tensor-to-scaler ratio with different pivot scales.
- inflation ,
- cosmic microwave background ,
- initial state

References

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Ata Sojasi, Ebrahim Yusofi and Majid Mohsenzadeh. Asymptotic-de sitter inflation in the light of the planck data[J]. Chinese Physics C, 2018, 42(11): 115102. doi: 10.1088/1674-1137/42/11/115102

Ata Sojasi, Ebrahim Yusofi and Majid Mohsenzadeh. Asymptotic-de sitter inflation in the light of the planck data[J]. Chinese Physics C, 2018, 42(11): 115102. doi: 10.1088/1674-1137/42/11/115102 shu

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Received: 2018-04-19
Revised: 2018-07-14

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

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Asymptotic-de sitter inflation in the light of the planck data

1. Department of physics, Rasht Branch, Islamic Azad University, Rasht, Iran

2. Department of Physics, Ayatollah Amoli Branch, Islamic Azad University, Amol, Mazandaran, Iran

3. Department of Physics, Qom Branch, Islamic Azad University, Qom, Iran

Received Date: 2018-04-19

Accepted Date: 2018-07-14

Available Online: 2018-11-05

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

Abstract: Planck 2015 data, emphasize that the background geometry during inflation is not pure de Sitter, but from the slow variation of Hubble parameter during the inflationary era, it can be quasi-de Sitter. This motivates us to consider an Asymptotic-de Sitter mode function for reconstructing of initial mode and primordial power spectrum of curvature perturbation. Using Markov Chain Monte Carlo (MCMC) method together with applying recent observational constraints from the Cosmic Microwave Background (CMB) data for the parameterized asymptotic initial mode in term of c, show some deviation from Bunch-Davies mode (c=1). Based on Planck 2015 data release the amplitude of scalar perturbations in 68% confidence level is 10⁹ A_s=2.94_-0.42^+0.42 and deviation from Bunch-Davies mode is~0.05, i.e. c~1.05. In this parametrization, the CMB power spectrum of our model shows more red-tilt in comparison with ∧CDM model. Furthermore, we found upper limits for tensor-to-scaler ratio with different pivot scales.

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Asymptotic-de sitter inflation in the light of the planck data

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