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Loop corrections to Delta N_eff in large volume models
High Energy Physics - Phenomenology · Submitted 17 May 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The result turns out to be too large to be consistent with data, highly disfavouring the minimal model.
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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. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
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The abstract, sentence by sentence
In large volume models reheating is driven by the decays of the volume modulus to the visible sector, while the decays to its axion partners result in dark radiation. In this article we discuss the impact of loop corrections on the only model-independent visible decay channel: the decay into Higgs pairs via a Giudice-Masiero term. Including such radiative effects leads to a more precise determination of the relative fraction of dark radiation, since by contrast all loop corrections to the volume axion decay mode are Planck suppressed. Assuming an MSSM spectrum and that the Giudice-Masiero coupling is fixed at the string scale by a shift symmetry in the Higgs sector, we arrive at a prediction for the effective number of neutrinos. The result turns out to be too large to be consistent with data, highly disfavouring the minimal model.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | In large volume models reheating is driven by the decays of the volume modulus to the visible sector, while the decays to its axion partners result in dark radiation. | background 1.00 | 0.08 | 0.03 | asserted 1.00 |
| s1 | In this article we discuss the impact of loop corrections on the only model-independent visible decay channel: the decay into Higgs pairs via a Giudice-Masiero term. | contribution 1.00 | 0.65 | 0.05 | asserted 0.83 |
| s2 | Including such radiative effects leads to a more precise determination of the relative fraction of dark radiation, since by contrast all loop corrections to the volume axion decay mode are Planck suppressed. | result 0.44 | 0.71 | 0.12 | asserted 1.00 |
| s3 | Assuming an MSSM spectrum and that the Giudice-Masiero coupling is fixed at the string scale by a shift symmetry in the Higgs sector, we arrive at a prediction for the effective number of neutrinos. | method 0.82 | 0.85 | 0.05 | asserted 0.91 |
| s4 | The result turns out to be too large to be consistent with data, highly disfavouring the minimal model. | interpretation 0.68 | 0.91 | 0.89 | asserted 1.00 |
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The paper
Original abstract
In large volume models reheating is driven by the decays of the volume modulus to the visible sector, while the decays to its axion partners result in dark radiation. In this article we discuss the impact of loop corrections on the only model-independent visible decay channel: the decay into Higgs pairs via a Giudice-Masiero term. Including such radiative effects leads to a more precise determination of the relative fraction of dark radiation, since by contrast all loop corrections to the volume axion decay mode are Planck suppressed. Assuming an MSSM spectrum and that the Giudice-Masiero coupling is fixed at the string scale by a shift symmetry in the Higgs sector, we arrive at a prediction for the effective number of neutrinos. The result turns out to be too large to be consistent with data, highly disfavouring the minimal model.
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References
How the literature uses it
14 arXiv papers cite this in 18 sentences
Papers citing it · 11 sentences without a confident label
Uses its data or values 1 paper
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The most recent observational results from Planck 2018 give [ref] [equation] which is consistent with the Standard Model prediction, $N_eff ≃3.046$, and can be accounted for entirely by the known three generations of neutrinos.[If we include the direct astrophysical measurement of the Hubble constant $H_0$ by Riess et al [ref] gives $N_eff = 3.27±0.15$ ($68%$ confidence level) [ref] , allowing a small excess.] The predictions of LVS amount to an excess of $ΔN_eff ≃𝒪(1)$, which is robust against modifications and loop corrections [ref] .
Aligned Natural Inflation in the Large Volume Scenario · Introduction · 0.94
Cites it as support 1 paper
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In [ref] it was shown that these findings are robust if one also considers radiative corrections.
Dark Radiation predictions from general Large Volume Scenarios · Introduction · 0.96
Cites it as background 5 papers
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In this section we review DR predictions in the sequestered LVS from [ref] .
Dark Radiation predictions from general Large Volume Scenarios · Review: Dark Radiation in the sequestered Large Volume Scenario · 0.88
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There have been a number of interesting prior studies on axionic dark radiation in string theory [ref] .
The Axiverse induced Dark Radiation Problem · Introduction · 0.99
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A natural way to generate dark radiation is through the decays of long-lived massive particles [ref] (for a review, see Ref. [ref] ).
Is the CMB telling us that dark matter is weaker than weakly interacting? · Introduction · 0.86
What it cites · 19 sentences without a confident label
Uses data or values from 9 papers
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The latest Planck measurement of $N_eff$ [ref] with (without) the constraint from $H_0$ [ref] gives $ΔN_eff = 0.57 ±0.25$ ($ΔN_eff = 0.25 ±0.27$).
A 3% Solution: Determination of the Hubble Constant with the Hubble Space Telescope and Wide Field Camera 3 · Predictions for the effective excess number of neutrinos · 0.94
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The latest Planck measurement of $N_eff$ [ref] with (without) the constraint from $H_0$ [ref] gives $ΔN_eff = 0.57 ±0.25$ ($ΔN_eff = 0.25 ±0.27$).
Planck 2013 results. XVI. Cosmological parameters · Predictions for the effective excess number of neutrinos · 0.94
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Only points that lead to $m_h ∈[123, 129] GeV$ are retained, which is the range allowed by the ATLAS and CMS data [ref] if one accounts for the theoretical uncertainties in the MSSM calculation of the Higgs mass (see e.g. [ref] ).
Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC · Predictions for the effective excess number of neutrinos · 0.91
Cites as background 3 papers
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One string model of dark radiation was studied in [ref] within a sequestered form of the large volume scenario (LVS) [ref] (see also [ref] for more general considerations).
Dark Radiation and Dark Matter in Large Volume Compactifications · Introduction · 0.86
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One string model of dark radiation was studied in [ref] within a sequestered form of the large volume scenario (LVS) [ref] (see also [ref] for more general considerations).
Dark Radiation in LARGE Volume Models · Introduction · 0.86
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One string model of dark radiation was studied in [ref] within a sequestered form of the large volume scenario (LVS) [ref] (see also [ref] for more general considerations).
Moduli-Induced Axion Problem · Introduction · 0.86
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