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Quantum-spacetime scenarios and soft spectral lags of the remarkable GRB130427A
High Energy Astrophysical Phenomena · Submitted 12 May 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim A comparison of these features for GRBs at different redshifts provides some encouragement for a redshift dependence of the effects of the type expected for a quantum-spacetime interpretation, but other aspects of the analysis appear to invite the interpretation as intrinsic properties of GRBs.
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We process the Fermi LAT data on GRB130427A using the Fermi Science Tools, and we summarize some of the key facts that render this observation truly remarkable, especially concerning the quality of information on high-energy emission by GRBs. We then exploit this richness for a search of spectral lags, of the type that has been recently of interest for its relevance in quantum-spacetime research. We do find some evidence of systematic soft spectral lags: when confining the analysis to photons of energies greater than 5 GeV there is an early hard development of minibursts within this long burst. The effect turns out to be well characterized quantitatively by a linear dependence, within such a miniburst, of the detection time on energy. With the guidance of our findings for GRB130427A we can then recognize that some support for these features is noticeable also in earlier Fermi-LAT GRBs, particularly for the presence of hard minibursts whose onset is marked by the highest-energy photon observed for the GRB. A comparison of these features for GRBs at different redshifts provides some encouragement for a redshift dependence of the effects of the type expected for a quantum-spacetime interpretation, but other aspects of the analysis appear to invite the interpretation as intrinsic properties of GRBs.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We process the Fermi LAT data on GRB130427A using the Fermi Science Tools, and we summarize some of the key facts that render this observation truly remarkable, especially concerning the quality of information on high-energy emission by GRBs. | method 0.78 | 0.93 | 0.03 | asserted 0.96 |
| s1 | We then exploit this richness for a search of spectral lags, of the type that has been recently of interest for its relevance in quantum-spacetime research. | contribution 0.61 | 0.83 | 0.04 | asserted 0.73 |
| s2 | We do find some evidence of systematic soft spectral lags: when confining the analysis to photons of energies greater than 5 GeV there is an early hard development of minibursts within this long burst. | result 1.00 | 0.96 | 0.35 | asserted 0.69 |
| s3 | The effect turns out to be well characterized quantitatively by a linear dependence, within such a miniburst, of the detection time on energy. | result 1.00 | 0.94 | 0.12 | asserted 1.00 |
| s4 | With the guidance of our findings for GRB130427A we can then recognize that some support for these features is noticeable also in earlier Fermi-LAT GRBs, particularly for the presence of hard minibursts whose onset is marked by the highest-energy photon observed for the GRB. | result 0.96 | 0.83 | 0.10 | hedged possibility 0.92 |
| s5 | A comparison of these features for GRBs at different redshifts provides some encouragement for a redshift dependence of the effects of the type expected for a quantum-spacetime interpretation, but other aspects of the analysis appear to invite the interpretation as intrinsic properties of GRBs. | interpretation 1.00 | 0.85 | 0.62 | hedged possibility 1.00 |
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The paper
Original abstract
We process the Fermi LAT data on GRB130427A using the Fermi Science Tools, and we summarize some of the key facts that render this observation truly remarkable, especially concerning the quality of information on high-energy emission by GRBs. We then exploit this richness for a search of spectral lags, of the type that has been recently of interest for its relevance in quantum-spacetime research. We do find some evidence of systematic soft spectral lags: when confining the analysis to photons of energies greater than 5 GeV there is an early hard development of minibursts within this long burst. The effect turns out to be well characterized quantitatively by a linear dependence, within such a miniburst, of the detection time on energy. With the guidance of our findings for GRB130427A we can then recognize that some support for these features is noticeable also in earlier Fermi-LAT GRBs, particularly for the presence of hard minibursts whose onset is marked by the highest-energy photon observed for the GRB. A comparison of these features for GRBs at different redshifts provides some encouragement for a redshift dependence of the effects of the type expected for a quantum-spacetime interpretation, but other aspects of the analysis appear to invite the interpretation as intrinsic properties of GRBs.
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References
How the literature uses it
8 arXiv papers cite this in 13 sentences
Papers citing it · 9 sentences without a confident label
Uses its method or tool 1 paper
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Following a standard strategy of analysis (see, e.g., Refs. [ref] ) we estimate how frequently $25 ≤η_γ^[pair] ≤35$ should occur in absence of correlation between $Δt_pair$ and $E^*_pair$ by producing $10^5$ sets of simulated data, each obtained by reshuffling randomly the times of observation of the photons in our sample.
In-vacuo-dispersion-like spectral lags in gamma-ray bursts · Introduction · 0.97
Uses its data or values 1 paper
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Our reference scenario is a short burst with $Δt = 1 sec$ at a redshift of $z = 1$, with a maximum observed photon energy of $E_max = 100 GeV$, close to that of GRB130427A [ref] .
The potential of the HAWC Observatory to observe violations of Lorentz Invariance · Potential of HAWC for setting limits on LIV · 0.80
Cites it as background 2 papers
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A compilation of results can be found in [ref] , with additional results reported in [ref] .
The potential of the HAWC Observatory to observe violations of Lorentz Invariance · Limits on the Violation of Lorentz Invariance · 0.87
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Possible tests of QG in GRBs have been recently proposed [ref] .
Time delays between Fermi LAT and GBM light curves of GRBs · Introduction · 0.84
What it cites · 18 sentences without a confident label
Uses data or values from 1 paper
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Ref. [ref] focuses however on the 3 Icecube neutrinos that one can find in published material [ref] and that are plausible (though weak) GRB-neutrino candidates.
Possible relevance of quantum spacetime for neutrino-telescope data analyses · A speculation about GRB neutrinos · 0.83
Compares with 1 paper
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Evidently what we found in the present analysis inspired and based in part on GRB130427A is at least to some extent consistent with what was found in Ref. [ref] for the 3.3 TeV and the 109 TeV neutrinos.
Possible relevance of quantum spacetime for neutrino-telescope data analyses · A speculation about GRB neutrinos · 0.97
Cites as background 3 papers
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A rich phenomenological program was developed over the last decade on the basis of results for models of spacetime quantization suggesting that (see, e.g., [ref] ) it is possible for the quantum properties of spacetime to introduce small violations of the special relativistic properties of classical spacetime.
Potential Sensitivity of Gamma-Ray Burster Observations to Wave Dispersion in Vacuo · A scenario for quantum spacetime · 0.93
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A rich phenomenological program was developed over the last decade on the basis of results for models of spacetime quantization suggesting that (see, e.g., [ref] ) it is possible for the quantum properties of spacetime to introduce small violations of the special relativistic properties of classical spacetime.
Ultraviolet modifications of dispersion relations in effective field theory · A scenario for quantum spacetime · 0.93
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A rich phenomenological program was developed over the last decade on the basis of results for models of spacetime quantization suggesting that (see, e.g., [ref] ) it is possible for the quantum properties of spacetime to introduce small violations of the special relativistic properties of classical spacetime.
Waves on Noncommutative Spacetime and Gamma-Ray Bursts · A scenario for quantum spacetime · 0.93
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