Cosmology and Nongalactic Astrophysics · arXiv:1304.8049 v1 · submitted 30 Apr 2013
Primordial Non-Gaussianity and Reionization
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“In principle, futuristic redshifted 21 cm surveys may allow constraints competitive with Planck.”
from the abstract · picked out as the main claim by a classifier
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The paper
Abstract
The statistical properties of the primordial perturbations contain clues about the origins of those fluctuations. Although the Planck collaboration has recently obtained tight constraints on primordial non-gaussianity from cosmic microwave background measurements, it is still worthwhile to mine upcoming data sets in effort to place independent or competitive limits. The ionized bubbles that formed at redshift z 6-20 during the Epoch of Reionization are seeded by primordial overdensities, and so the statistics of the ionization field at high redshift are related to the statistics of the primordial field. Here we model the effect of primordial non-gaussianity on the reionization field. The epoch and duration of reionization are affected as are the sizes of the ionized bubbles, but these changes are degenerate with variations in the properties of the ionizing sources and the surrounding intergalactic medium. A more promising signature is the power spectrum of the spatial fluctuations in the ionization field, which may be probed by upcoming 21 cm surveys. This has the expected 1/k^2 dependence on large scales, characteristic of a biased tracer of the matter field. We project how well upcoming 21 cm observations will be able to disentangle this signal from foreground contamination. Although foreground cleaning inevitably removes the large-scale modes most impacted by primordial non-gaussianity, we find that primordial non-gaussianity can be separated from foreground contamination for a narrow range of length scales. In principle, futuristic redshifted 21 cm surveys may allow constraints competitive with Planck.
The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. No sentence in this record was written by a model.
abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: hedged possibility 1.00
What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.94 · human participants 0.01 · controlled comparison 0.07 · randomized assignment 0.01 · states quantitative result 0.13 · compares with prior results 0.78 · mentions code or data availability 0.02
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v1). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| The statistical properties of the primordial perturbations contain clues about the origins of those fluctuations. | background 1.00 | 0.04 | 0.02 | asserted 0.79 |
| Although the Planck collaboration has recently obtained tight constraints on primordial non-gaussianity from cosmic microwave background measurements, it is still worthwhile to mine upcoming data sets in effort to place independent or competitive limits. | background 0.79 | 0.04 | 0.04 | asserted 0.74 |
| The ionized bubbles that formed at redshift z~6-20 during the Epoch of Reionization are seeded by primordial overdensities, and so the statistics of the ionization field at high redshift are related to the statistics of the primordial field. | background 1.00 | 0.07 | 0.06 | asserted 1.00 |
| Here we model the effect of primordial non-gaussianity on the reionization field. | contribution 0.89 | 0.90 | 0.05 | asserted 0.94 |
| The epoch and duration of reionization are affected as are the sizes of the ionized bubbles, but these changes are degenerate with variations in the properties of the ionizing sources and the surrounding intergalactic medium. | limitation 0.65 | 0.57 | 0.07 | asserted 0.99 |
| A more promising signature is the power spectrum of the spatial fluctuations in the ionization field, which may be probed by upcoming 21 cm surveys. | result 0.45 | 0.41 | 0.32 | hedged possibility 1.00 |
| This has the expected 1/k^2 dependence on large scales, characteristic of a biased tracer of the matter field. | result 0.67 | 0.50 | 0.06 | asserted 0.99 |
| We project how well upcoming 21 cm observations will be able to disentangle this signal from foreground contamination. | contribution 0.58 | 0.79 | 0.06 | asserted 0.66 |
| Although foreground cleaning inevitably removes the large-scale modes most impacted by primordial non-gaussianity, we find that primordial non-gaussianity can be separated from foreground contamination for a narrow range of length scales. | result 0.84 | 0.93 | 0.42 | asserted 0.99 |
| In principle, futuristic redshifted 21 cm surveys may allow constraints competitive with Planck. | interpretation 0.64 | 0.32 | 0.48 | hedged possibility 1.00 |
What kind of paper the classifier reports this is: theoretical result 0.89 · evidence from simulation or computation 0.51
What was examined, and what was not
Sources read
- arXiv listing abstract v1
Not examined
- full text
- figures and tables
- references and citing sentences
- relations to other papers
Levels run
- P abstract
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- S sections
- T body sentences
- C citations
- R cross-paper relations
How the labels were made
Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 7,633 input tokens, $0.0003 reported.
Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. This record as JSON
Cited by 4 Pith papers
Reviewed papers on Pith that cite this one. The full citation record
- Perturbative Reheating After Multiple-Field Inflation: The Impact on Primordial Observables astro-ph.CO · Nov 2013
- Constraints on primordial non-Gaussianity from 800,000 photometric quasars astro-ph.CO · May 2014
- Cosmology on Ultralarge Scales with Intensity Mapping of the Neutral Hydrogen 21 cm Emission: Limits on Primordial Non-Gaussianity astro-ph.CO · May 2013
- Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment astro-ph.CO · Oct 2018
How the literature uses it
10 arXiv papers cite this in 10 sentences
Papers citing it · 7 sentences without a confident label
Cites it as background 3 papers
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While non-Gaussianity from $21$cm has been studied in the dark ages [ref] and the epoch of reionization [ref] , our focus in this section will be on the low-redshift universe [ref] , specifically constraints coming from the proposed Stage ii experiment in the redshift range $2≤z ≤6$.
Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment · Primordial non-Gaussianity · 0.81
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The cosmological 21-cm signal contains information that could potentially deepen our understanding on the star formation history [ref] , the epoch of reionization (EoR) [ref] , the nature of dark matter [ref] , and other cosmological quantities [ref] .
Semi-analytical approach to Ly$\alpha$ multiple-scattering in 21-cm signal simulations · Introduction · 0.99
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Further input on (primordial and otherwise) non-Gaussian characterizations of inflationary models is expected to originate from Large Scale Structure sources (see, e.g., [ref] ) and possibly from future CMB polarization experiments (see, e.g., [ref] , [ref] and [ref] ) Another important probe might well be 21cm cosmology [ref] .
On the Trispectrum of Galileon Inflation · Conclusions · 0.84
What it cites · 1 sentence without a confident label
Uses the method or tool of 1 paper
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Following [ref] , we define $𝒫_0(S_m)$ as an expansion in the barrier: [equation] The scale-independent part of the bias can then be written as [equation] which reduces to the standard expression from e.g. [ref] in the limit that the barrier is linear.
The Kinetic Sunyaev-Zel'dovich Effect from Reionization · Scale-dependent Bias · 0.86
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