Cosmology and Nongalactic Astrophysics · arXiv:1303.6255 v2 · submitted 25 Mar 2013
Spectator field models in light of spectral index after Planck
The paper says
“This implies that, during inflation, either (i) the Hubble parameter varies significantly as in chaotic inflation, or (ii) a scalar potential for the spectator field has a relatively large negative curvature.”
from the abstract · picked out as the main claim by a classifier
Reviews
Reviews by people
No person has reviewed this paper on Pith yet. A scientist listed on Pith can review it for a fee, and their review is published here whatever it concludes.
The paper
Abstract
We revisit spectator field models including curvaton and modulated reheating scenarios, specifically focusing on their viability in the new Planck era, based on the derived expression for the spectral index in general spectator field models. Importantly, the recent Planck observations give strong preference to a red-tilted power spectrum, while the spectator field models tend to predict a scale-invariant one. This implies that, during inflation, either (i) the Hubble parameter varies significantly as in chaotic inflation, or (ii) a scalar potential for the spectator field has a relatively large negative curvature. Combined with the tight constraint on the non-Gaussianity, the Planck data provides us with rich implications for various spectator field models.
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 0.66
What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.21 · human participants 0.01 · controlled comparison 0.05 · randomized assignment 0.01 · states quantitative result 0.10 · compares with prior results 0.39 · mentions code or data availability 0.02
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v2). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| We revisit spectator field models including curvaton and modulated reheating scenarios, specifically focusing on their viability in the new Planck era, based on the derived expression for the spectral index in general spectator field models. | contribution 0.97 | 0.82 | 0.10 | asserted 0.79 |
| Importantly, the recent Planck observations give strong preference to a red-tilted power spectrum, while the spectator field models tend to predict a scale-invariant one. | background 0.81 | 0.07 | 0.20 | asserted 0.95 |
| This implies that, during inflation, either (i) the Hubble parameter varies significantly as in chaotic inflation, or (ii) a scalar potential for the spectator field has a relatively large negative curvature. | interpretation 0.98 | 0.46 | 0.51 | hedged possibility 0.66 |
| Combined with the tight constraint on the non-Gaussianity, the Planck data provides us with rich implications for various spectator field models. | interpretation 0.90 | 0.35 | 0.17 | asserted 0.92 |
What kind of paper the classifier reports this is: theoretical result 0.96 · evidence from analysis of existing data 0.79
What was examined, and what was not
Sources read
- arXiv listing abstract v2
Not examined
- full text
- figures and tables
- references and citing sentences
- relations to other papers
Levels run
- P abstract
Not run
- 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, 3,672 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
Cited by 4 Pith papers
Reviewed papers on Pith that cite this one. The full citation record
- Oscillating scalar fields and the Hubble tension: a resolution with novel signatures astro-ph.CO · Aug 2019
- Isocurvature Constraints and Anharmonic Effects on QCD Axion Dark Matter hep-ph · Apr 2013
- Comprehensive analysis of the simplest curvaton model astro-ph.CO · Mar 2014
- Mixed Inflaton and Spectator Field Models after Planck astro-ph.CO · Jun 2013
How the literature uses it
17 arXiv papers cite this in 17 sentences
Papers citing it · 9 sentences without a confident label
Compares with it 1 paper
-
This can be compared to the usual spectator field scenarios, where a negative mass for the spectator field or $p≥2$ is required in order to reproduce the observed red-tilted spectrum [ref] .
Non-linear curvature perturbation in multi-field inflation models with non-minimal coupling · Summary and Conclusions · 0.91
Cites it as background 7 papers
-
A particular example of the latter class is the curvaton model [ref] , and there have been several reports on the status of those models in the light of Planck satellite results [ref] .
Comprehensive analysis of the simplest curvaton model · Introduction · 0.96
-
Instead of attempting to somehow sample the full space of multifield models, we restrict ourselves to an interesting subset, so-called “spectator models” (see also e.g. [ref] ), that capture key phenomenology of generating large $$.
The next non-Gaussianity frontier: what can a measurement with $\sigma(f_{\rm NL}) \lesssim 1$ tell us about multifield inflation? · Introduction · 0.85
-
This has been the topic of a number of recent papers [ref] .
Curvaton scenarios with inflaton decays into curvatons · Introduction · 0.92
What it cites · 28 sentences without a confident label
Uses data or values from 4 papers
-
The Planck data put an extremely stringent constraint on $f_NL^local$ as [ref]
Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity · Introduction · 0.94
-
The power spectrum of the curvature perturbations is usually characterized by its amplitude and spectral index, $𝒫_ζ$ and $n_s$, which were recently determined by the Planck satellite with unprecedented accuracy as [ref] ,
Planck 2013 results. XXII. Constraints on inflation · Introduction · 0.96
-
According to the Planck analysis on the one-parameter extensions, the scale-invariant power spectrum is marginally allowed at 2$σ$ level [ref] .
Planck 2013 results. XVI. Cosmological parameters · Discussion and conclusions · 0.87
Cites as background 14 papers
-
The implications for the curvaton model were studied in Refs. [ref] . ]
Non-Gaussianity from Curvatons Revisited · Introduction · 0.80
-
The implications for the curvaton model were studied in Refs. [ref] . ]
Non-Gaussianity from Axionic Curvaton · Introduction · 0.80
-
In the curvaton scenario [ref] , the spectator field $σ$ (which we refer to as the curvaton in this section) undergoes oscillations around its potential minimum in the post-inflationary era.
Adiabatic CMB perturbations in pre-big bang string cosmology · Planck constraints on curvaton scenarios · 0.99
Challenges and discussion
Know something about this paper? Leave a comment.
Come back by email
A short list of the week's newly reviewed papers. Nothing is sent until you confirm from your inbox, and every email has a link that stops it. No account.
No comments yet.
Sign in to comment