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Title: Inflationary schism

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1197706
Grant/Contract Number:
FG02-91ER40671
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 736; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-28 10:16:23; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Ijjas, Anna, Steinhardt, Paul J., and Loeb, Abraham. Inflationary schism. Netherlands: N. p., 2014. Web. doi:10.1016/j.physletb.2014.07.012.
Ijjas, Anna, Steinhardt, Paul J., & Loeb, Abraham. Inflationary schism. Netherlands. doi:10.1016/j.physletb.2014.07.012.
Ijjas, Anna, Steinhardt, Paul J., and Loeb, Abraham. Mon . "Inflationary schism". Netherlands. doi:10.1016/j.physletb.2014.07.012.
@article{osti_1197706,
title = {Inflationary schism},
author = {Ijjas, Anna and Steinhardt, Paul J. and Loeb, Abraham},
abstractNote = {},
doi = {10.1016/j.physletb.2014.07.012},
journal = {Physics Letters. Section B},
number = C,
volume = 736,
place = {Netherlands},
year = {Mon Sep 01 00:00:00 EDT 2014},
month = {Mon Sep 01 00:00:00 EDT 2014}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2014.07.012

Citation Metrics:
Cited by: 24works
Citation information provided by
Web of Science

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  • The phase-integral approximation devised by Froeman and Froeman, is used for computing cosmological perturbations in the power-law inflationary model. The phase-integral formulas for the scalar and tensor power spectra are explicitly obtained up to ninth-order of the phase-integral approximation. We show that, the phase-integral approximation exactly reproduces the shape of the power spectra for scalar and tensor perturbations as well as the spectral indices. We compare the accuracy of the phase-integral approximation with the results for the power spectrum obtained with the slow-roll and uniform-approximation methods.
  • The phase-integral approximation devised by Froeman and Froeman is used for computing cosmological perturbations in the quadratic chaotic inflationary model. The phase-integral formulas for the scalar and tensor power spectra are explicitly obtained up to fifth order of the phase-integral approximation. We show that the phase integral gives a very good approximation for the shape of the power spectra associated with scalar and tensor perturbations as well as the spectral indices. We find that the accuracy of the phase-integral approximation compares favorably with the numerical results and those obtained using the slow-roll and uniform-approximation methods.
  • How sensitive are the predictions of inflation to pre-inflationary conditions when the number of efolds of inflation is not too large? In an attempt to address this question, we consider a simple model where the inflationary era is preceded by an era dominated by a radiation fluid, which is coupled to the inflaton only gravitationally and which extends back to the Planck era. We show that there is a natural generalized Bunch-Davies vacuum state for perturbations to the coupled inflaton-gravity-fluid system at early times. With this choice of initial state the model predicts interesting deviations from the standard power spectrummore » of single field slow-roll inflation at large scales. However, the deviations are too small to be observable in near future CMB observations.« less
  • How sensitive are the predictions of inflation to pre-inflationary conditions when the number of efolds of inflation is not too large? In an attempt to address this question, we consider a simple model where the inflationary era is preceded by an era dominated by a radiation fluid, which is coupled to the inflaton only gravitationally and which extends back to the Planck era. We show that there is a natural generalized Bunch-Davies vacuum state for perturbations to the coupled inflaton-gravity-fluid system at early times. With this choice of initial state the model predicts interesting deviations from the standard power spectrummore » of single field slow-roll inflation at large scales. However, the deviations are too small to be observable in near future CMB observations.« less
  • In this paper a possible reheating mechanism in inflationary universe models is studied in some detail. Results are presented of numerical investigations of particle creation and corresponding reheating within a self-coupled scalar field model. By using the method of Hamiltonian diagonalization attention is devoted to the time development of the process and its parameter dependence. The effect of particle production is found to depend strongly on the anharmonicity of the potential around its minimum and on the amplitude of the oscillations of the scalar background field.