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Cosmology and Nongalactic Astrophysics · arXiv:1104.5403 v3 · submitted 28 Apr 2011

The High-Redshift Neutral Hydrogen Signature of an Anisotropic Matter Power Spectrum

Oscar F. Hernandez, Gilbert P. Holder

PDF · arXiv · The abstract, sentence by sentence · Cite

The paper says

“Pushing to higher redshifts and higher sensitivity will allow highly precise (percent level) measurements of anisotropy.”

from the abstract · picked out as the main claim by a classifier

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The paper

Abstract

An anisotropic power spectrum will have a clear signature in the 21cm radiation from high-redshift hydrogen. We calculate the expected power spectrum of the intensity fluctuations in neutral hydrogen from before the epoch of reionization, and predict the accuracy to which future experiments could constrain a quadrupole anisotropy in the power spectrum. We find that the Square Kilometer Array will have marginal detection abilities for this signal at z 17 if the process of reionization has not yet started; reionization could enhance the detectability substantially. Pushing to higher redshifts and higher sensitivity will allow highly precise (percent level) measurements of anisotropy.

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: asserted 0.69

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.75 · human participants 0.01 · controlled comparison 0.05 · randomized assignment 0.01 · states quantitative result 0.71 · compares with prior results 0.11 · mentions code or data availability 0.02

The abstract, sentence by sentence

This table labels the abstract only (arXiv listing abstract v3). The number is the probability the classifier gave the label.

SentenceRoleThe authors' own workStates the main conclusionStrength
An anisotropic power spectrum will have a clear signature in the 21cm radiation from high-redshift hydrogen. background 0.95 0.09 0.38 asserted 0.99
We calculate the expected power spectrum of the intensity fluctuations in neutral hydrogen from before the epoch of reionization, and predict the accuracy to which future experiments could constrain a quadrupole anisotropy in the power spectrum. contribution 0.98 0.94 0.13 asserted 0.94
We find that the Square Kilometer Array will have marginal detection abilities for this signal at z~17 if the process of reionization has not yet started; reionization could enhance the detectability substantially. result 0.99 0.91 0.34 asserted 0.59
Pushing to higher redshifts and higher sensitivity will allow highly precise (percent level) measurements of anisotropy. interpretation 0.47 0.55 0.30 asserted 0.69

What kind of paper the classifier reports this is: theoretical result 0.96 · evidence from simulation or computation 0.81

What was examined, and what was not

Sources read

  • arXiv listing abstract v3

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, 3,666 input tokens, $0.0002 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

How the literature uses it

1 arXiv paper cite this in 3 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 2 sentences without a confident label

Uses its method or tool 1 paper

What it cites · 11 sentences without a confident label

Uses the method or tool of 2 papers
  • We follow Pullen-Kamionkowski [ref] and expand the anisotropic $P_b(q⃗)$ in terms of spherical harmonics P_b(q⃗) = 𝒫(q) [1+∑_L,M g_L,M (q) Y_L,M(q̂)] To estimate the constraints possible on the $g_L,M$'s, we calculate the Fisher matrix.

    Cosmic Microwave Background Statistics for a Direction-Dependent Primordial Power Spectrum · Forecasting the anisotropies · 0.97

  • We follow [ref] for the definition of the $a$'s, and applying it to our case, for large $l$ we define a 2-D vector $l⃗=(lcosϕ_l,lsinϕ_l)$, such that a(l⃗,χ) = ( ∑^l_m=-l [(i l)^-m√(4π2l+1(l+m)!(l-m)!) e^imϕ_l a_lm ] ) ∼ ∫d^2ϵ e^(-i l⃗ ·ϵ⃗) δ_21(χ,x̂)

    Interferometric Observation of Cosmic Microwave Background Anisotropies · The angular power spectrum in the flat sky distant observer approximation · 0.85

Uses data or values from 2 papers
Cites as background 3 papers

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