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Reconciliation of high energy scale models of inflation with Planck

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Reconciliation of high energy scale models of inflation with Planck. / Ashoorioon, Amjad; Dimopoulos, Konstantinos; M. Sheikh-Jabbari, Mohammad et al.
In: Journal of Cosmology and Astroparticle Physics, Vol. 2014, No. 2, 025, 14.02.2014.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Ashoorioon, A, Dimopoulos, K, M. Sheikh-Jabbari, M & Shiu, G 2014, 'Reconciliation of high energy scale models of inflation with Planck', Journal of Cosmology and Astroparticle Physics, vol. 2014, no. 2, 025. https://doi.org/10.1088/1475-7516/2014/02/025

APA

Ashoorioon, A., Dimopoulos, K., M. Sheikh-Jabbari, M., & Shiu, G. (2014). Reconciliation of high energy scale models of inflation with Planck. Journal of Cosmology and Astroparticle Physics, 2014(2), Article 025. https://doi.org/10.1088/1475-7516/2014/02/025

Vancouver

Ashoorioon A, Dimopoulos K, M. Sheikh-Jabbari M, Shiu G. Reconciliation of high energy scale models of inflation with Planck. Journal of Cosmology and Astroparticle Physics. 2014 Feb 14;2014(2):025. doi: 10.1088/1475-7516/2014/02/025

Author

Ashoorioon, Amjad ; Dimopoulos, Konstantinos ; M. Sheikh-Jabbari, Mohammad et al. / Reconciliation of high energy scale models of inflation with Planck. In: Journal of Cosmology and Astroparticle Physics. 2014 ; Vol. 2014, No. 2.

Bibtex

@article{1900bd830ca94072b6cf584f6fe437cd,
title = "Reconciliation of high energy scale models of inflation with Planck",
abstract = "The inflationary cosmology paradigm is very successful in explaining the CMB anisotropy to the percent level. Besides the dependence on the inflationary model, the power spectra, spectral tilt and non-Gaussianity of the CMB temperature fluctuations also depend on the initial state of inflation. Here, we examine to what extent these observables are affected by our ignorance in the initial condition for inflationary perturbations, due to unknown new physics at a high scale M. For initial states that satisfy constraints from backreaction, we find that the amplitude of the power spectra could still be signifcantly altered, while the modifcation in bispectrum remains small. For such initial states, M has an upper bound of a few tens of H, with H being the Hubble parameter during inflation. We show that for M~20H, such initial states always (substantially) suppress the tensor to scalar ratio. In particular we show that such a choice of initial conditions can satisfactorily reconcile the simple quadratic chaotic model with the Planck data.",
keywords = "inflationary universe, excited states, transplanckian physics, non-gaussianity, cosmological perturbation theory , inflation",
author = "Amjad Ashoorioon and Konstantinos Dimopoulos and {M. Sheikh-Jabbari}, Mohammad and Gary Shiu",
note = "Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.",
year = "2014",
month = feb,
day = "14",
doi = "10.1088/1475-7516/2014/02/025",
language = "English",
volume = "2014",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing",
number = "2",

}

RIS

TY - JOUR

T1 - Reconciliation of high energy scale models of inflation with Planck

AU - Ashoorioon, Amjad

AU - Dimopoulos, Konstantinos

AU - M. Sheikh-Jabbari, Mohammad

AU - Shiu, Gary

N1 - Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

PY - 2014/2/14

Y1 - 2014/2/14

N2 - The inflationary cosmology paradigm is very successful in explaining the CMB anisotropy to the percent level. Besides the dependence on the inflationary model, the power spectra, spectral tilt and non-Gaussianity of the CMB temperature fluctuations also depend on the initial state of inflation. Here, we examine to what extent these observables are affected by our ignorance in the initial condition for inflationary perturbations, due to unknown new physics at a high scale M. For initial states that satisfy constraints from backreaction, we find that the amplitude of the power spectra could still be signifcantly altered, while the modifcation in bispectrum remains small. For such initial states, M has an upper bound of a few tens of H, with H being the Hubble parameter during inflation. We show that for M~20H, such initial states always (substantially) suppress the tensor to scalar ratio. In particular we show that such a choice of initial conditions can satisfactorily reconcile the simple quadratic chaotic model with the Planck data.

AB - The inflationary cosmology paradigm is very successful in explaining the CMB anisotropy to the percent level. Besides the dependence on the inflationary model, the power spectra, spectral tilt and non-Gaussianity of the CMB temperature fluctuations also depend on the initial state of inflation. Here, we examine to what extent these observables are affected by our ignorance in the initial condition for inflationary perturbations, due to unknown new physics at a high scale M. For initial states that satisfy constraints from backreaction, we find that the amplitude of the power spectra could still be signifcantly altered, while the modifcation in bispectrum remains small. For such initial states, M has an upper bound of a few tens of H, with H being the Hubble parameter during inflation. We show that for M~20H, such initial states always (substantially) suppress the tensor to scalar ratio. In particular we show that such a choice of initial conditions can satisfactorily reconcile the simple quadratic chaotic model with the Planck data.

KW - inflationary universe

KW - excited states

KW - transplanckian physics

KW - non-gaussianity

KW - cosmological perturbation theory

KW - inflation

U2 - 10.1088/1475-7516/2014/02/025

DO - 10.1088/1475-7516/2014/02/025

M3 - Journal article

VL - 2014

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 2

M1 - 025

ER -