Low power on large scales in just enough inflation models

Erandy Ramirez

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Low power on large scales in just enough inflation models

Erandy Ramirez

Cosmology and Nongalactic Astrophysics · Submitted 3 Feb 2012

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim Using initial conditions inside the 1-sigma interval of the best-fit cosmological parameters for the potentials, low values for the quadrupole component can be obtained.

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An early stage of kinetic energy domination for inflation is applied to single-field quadratic and hybrid-type potentials considering only the amount of inflation necessary to solve the problems of the standard cosmological scenario. Using initial conditions inside the 1-sigma interval of the best-fit cosmological parameters for the potentials, low values for the quadrupole component can be obtained.

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#	sentence	role	the authors' own work	states the main conclusion	strength
s0	An early stage of kinetic energy domination for inflation is applied to single-field quadratic and hybrid-type potentials considering only the amount of inflation necessary to solve the problems of the standard cosmological scenario.	contribution 0.61	0.74	0.12	asserted 0.87
s1	Using initial conditions inside the 1-sigma interval of the best-fit cosmological parameters for the potentials, low values for the quadrupole component can be obtained.	result 0.98	0.81	0.60	hedged possibility 0.69

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Original abstract

An early stage of kinetic energy domination for inflation is applied to single-field quadratic and hybrid-type potentials considering only the amount of inflation necessary to solve the problems of the standard cosmological scenario. Using initial conditions inside the 1-sigma interval of the best-fit cosmological parameters for the potentials, low values for the quadrupole component can be obtained.

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References

Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Generating primordial features at large scales in two field models of inflation
astro-ph.CO 2020-04 conditional novelty 6.0 of 10

A non-canonical kinetic coupling between two inflaton fields suppresses isocurvature feedback and preserves a large-scale step in the primordial power spectrum, whereas the same step in canonical double inflation is erased.
CMB Anomalies after Planck
astro-ph.CO 2015-10 conditional novelty 4.0 of 10

The paper argues that three large-angle CMB anomalies (missing angular correlation, alignment of the lowest multipoles, and hemispherical power asymmetry) are mutually independent, so their combined chance probability...
Features and New Physical Scales in Primordial Observables: Theory and Observation
astro-ph.CO 2015-05 accept novelty 4.0 of 10

Features in primordial correlation functions, if they exist, would let cosmologists infer new mass scales and partially discriminate between inflationary models that otherwise predict identical power spectra.

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11 arXiv papers cite this in 14 sentences

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Papers citing it · 9 sentences without a confident label

Cites it as support 1 paper

Indeed, recent results in [ref] indicate that a climbing phase would lead to a dampening of the power spectrum on large scales and oscillations superimposed on it that fit relatively well the Planck 2013 data [ref] .

Kasner solutions, climbing scalars and big-bang singularity · Conclusions · 0.96

Cites it as background 4 papers

A model that has drawn recent attention in the context of suppressing power on large scales involves a scalar field which begins its journey down the inflationary potential with the largest initial velocity possible (for the original discussion, see Ref. [ref] ; for recent discussions, see Refs. [ref] ).

Unique contributions to the scalar bispectrum in `just enough inflation' · Introduction · 0.85
Possible origins for these effects have been studied previously [ref] , but generally in the context of the minimal “just enough” inflation.

Inflection Points and the Power Spectrum · Introduction · 0.93
However, there is long-standing interest in “Just Enough" inflation (e.g. Refs [ref] ).

Signatures of the Very Early Universe: Inflation, Spatial Curvature and Large Scale Anomalies · Introduction · 0.82

What it cites · 17 sentences without a confident label

Builds on 1 paper

Following previous works in which a modification of the chaotic inflation scenario [ref] is proposed to quantify the predictions of the $λϕ^4$ potential [ref] , in this work the idea is further applied to the $m^2ϕ^2$ potential and a hybrid inflation potential during the stage when there is effectively a single field leading the dynamics.

Predictions of just-enough inflation · introduction · 0.99

Uses the method or tool of 2 papers

And an initial condition consistent with the solution of kinetic energy domination for the mode equation is also considered [ref] , [ref] : [equation] where $τ$ is conformal time defined as $dτ=dt/a(t)$, $h=a,_τ/a=aH$, $a$ the scale factor and $H_0^(2)$ is a Hankel function defined as $H_n^(2)(kτ)≡J_n(kτ)-iY_n(kτ)$, with $J_n$ and $Y_n$ Bessel functions and $n$ a positive integer.

Suppressing the lower Multipoles in the CMB Anisotropies · notation and procedure · 0.94
The best-fit parameters are obtained by reusing the existing parameters in the publicly available CAMB [ref] and COSMOMC codes [ref] .

Cosmological parameters from CMB and other data: a Monte-Carlo approach · notation and procedure · 0.97

Compares with 2 papers

The values of $ΔAIC$ for both potentials here are smaller than those for the $λϕ^4$ potential as seen in [ref] , the difference for the $m^2ϕ^2$ potential is the smallest of the three cases.

Predictions of just-enough inflation · results · 1.00
The predictions and results for this case are in accordance to those found in [ref] , applied to the scenario already mentioned in [ref] , in which the form of the power spectrum does not show a significant dependence on the choice of initial conditions.

Suppressing the lower Multipoles in the CMB Anisotropies · introduction · 0.86

Cites as support 1 paper

In accordance with the results of [ref] , initial conditions inside the 1$σ$ interval of the best-fit values for the field and $ϵ_1$ can give a significant suppression of power on the largest scales, and reproduce the value of the quadrupole at very large scales.

Predictions of just-enough inflation · discussion · 0.97

Cites as background 7 papers

An early epoch of kinetic energy domination has been proposed as an explanation for the smaller than expected power of the low multipoles of the CMB anisotropies [ref] , [ref] , [ref] , [ref] , [ref] , [ref] , [ref] , [ref] , [ref] .

Effects of a pre-inflation radiation-dominated epoch to CMB anisotropy · Low Multipoles · 0.80
An early epoch of kinetic energy domination has been proposed as an explanation for the smaller than expected power of the low multipoles of the CMB anisotropies [ref] , [ref] , [ref] , [ref] , [ref] , [ref] , [ref] , [ref] , [ref] .

The CMB Quadrupole depression produced by early fast-roll inflation: MCMC analysis of WMAP and SDSS data · Low Multipoles · 0.80
An early epoch of kinetic energy domination has been proposed as an explanation for the smaller than expected power of the low multipoles of the CMB anisotropies [ref] , [ref] , [ref] , [ref] , [ref] , [ref] , [ref] , [ref] , [ref] .

No large-angle correlations on the non-Galactic microwave sky · Low Multipoles · 0.80

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