Spectral Lag for a Radiating Jet Shell with a High-energy Cutoff Radiation Spectrum

Du, Shen-Shi; Lin, Da-Bin; Lu, Rui-Jing; Li, Rui-Quan; Gan, Ying-Ying; Ren, Jia; Wang, Xiang-Gao; Liang, En‐Wei

doi:10.3847/1538-4357/ab33fe

Cited by 12 publications

(13 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although there are numerous mechanisms to explain this [see e.g. [6][7][8][9][10][11][12], this behaviour is qualitatively the same as for a massive photon or a QG theory with ξ = +1 and could thus provide evidence for such theories.…”

Section: Introductionmentioning

confidence: 77%

Constraints on quantum gravity and the photon mass from gamma ray bursts

Bartlett,

Desmond,

Ferreira

et al. 2021

Preprint

View full text Add to dashboard Cite

Lorentz Invariance Violation in Quantum Gravity (QG) models or a non-zero photon mass, mγ, would lead to an energy-dependent propagation speed for photons, such that photons of different energies from a distant source would arrive at different times, even if they were emitted simultaneously. By developing source-by-source, Monte Carlo-based forward models for such time delays from Gamma Ray Bursts, and marginalising over empirical noise models describing other contributions to the time delay, we derive constraints on mγ and the QG length scale, QG, using spectral lag data from the BATSE satellite. We find mγ < 4.0 × 10 −5 h eV/c 2 and QG < 5.3 × 10 −18 h GeV −1 at 95% confidence, and demonstrate that these constraints are robust to the choice of noise model. The QG constraint is among the tightest from studies which consider multiple Gamma Ray Bursts and the constraint on mγ, although weaker than from using radio data, provides an independent constraint which is less sensitive to the effects of dispersion by electrons.

show abstract

Section: Introductionmentioning

confidence: 77%

Constraints on quantum gravity and the photon mass from gamma ray bursts

Bartlett,

Desmond,

Ferreira

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…We find that our weakest constraint is for the time delay between the highest and lowest energy channels ((i, j) = (4, 1)), where we find ∆γ 41 < 3.4 × 10 −15 at 1σ confidence. This is unsurprising because each pulse of a GRB's lightcurve is known to peak first at higher energy due to spectral evolution [47][48][49][50], although the reasons for this are not fully understood [20][21][22][23][24][25][26]. This results in the majority of observed time delays obeying ∆t ij > 0 for i > j, so one expects the largest time delay for this pair and hence the weakest constraint.…”

Section: Resultsmentioning

confidence: 99%

“…The physical mechanisms which result in the GRB spectral lag are unknown; the search for the nature of spectral lag is an ongoing research topic where most of the focus lies on investigating possible effects at the source [see e.g. [20][21][22][23][24][25][26]]. It has for example been shown that the effects of spectral lag can be recreated from simple source models utilising rapid bulk acceleration on relativistic jet shells [26].…”

Section: Observational Datamentioning

confidence: 99%

Constraints on Equivalence Principle Violation from Gamma Ray Bursts

Bartlett,

Bergsdal,

Desmond

et al. 2021

Preprint

View full text Add to dashboard Cite

Theories of gravity that obey the Weak Equivalence Principle have the same Parametrised Post-Newtonian parameter γ for all particles at all energies. The large Shapiro time delays of extragalactic sources allow us to put tight constraints on differences in γ between photons of different frequencies from spectral lag data, since a non-zero ∆γ would result in a frequency-dependent arrival time. The majority of previous constraints have assumed that the Shapiro time delay is dominated by a few local massive objects, although this is a poor approximation for distant sources. In this work we consider the cosmological context of these sources by developing a source-by-source, Monte Carlo-based forward model for the Shapiro time delays by combining constrained realisations of the local density field using the BORG algorithm with unconstrained large-scale modes. Propagating uncertainties in the density field reconstruction and marginalising over an empirical model describing other contributions to the time delay, we use spectral lag data of Gamma Ray Bursts from the BATSE satellite to constrain ∆γ < 3.4 × 10 −15 at 1σ confidence between photon energies of 25 keV and 325 keV.

show abstract

“…Ref. [64] has found a correlation between spectral and spectral evolution. We shall explore other models for intrinsic emission and their impact on LIV searches in the forthcoming sections.…”

Section: Model Used For Time Lagsmentioning

confidence: 95%

Search for Lorentz Invariance Violation from stacked Gamma-Ray Burst spectral lag data

Agrawal

Singirikonda

Desai

2021

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

A number of works have claimed detections of a turn-over in the spectral lag data for individual Gamma-Ray Bursts (GRBs), caused by an energy-dependent speed of light, which could be a possible manifestation of Lorentz invariance violation (LIV). Here, we stack the spectral lag data from a total of 37 GRBs (with a total of 91 measurements), to verify if the combined data is consistent with a unified model consisting of intrinsic astrophysical emission, along with another contribution due to LIV. We then carry out Bayesian model comparison to ascertain if this combined spectral lag data shows a preference for an energy-dependent speed of light, as compared to only an intrinsic astrophysical emission mechanism. We do not find a decisive evidence for such an energy-dependent speed of light for two different models of LIV. When we assume a constant intrinsic lag coupled with an unknown intrinsic scatter, we do not find any evidence for LIV. However, when we use GRB-dependent parameters to model the intrinsic emission, we get decisive evidence for LIV violation. We then carry out a search for LIV Standard Model Extension using this dataset as well as an independent search using a separate dataset consisting of rest-frame spectral lags. Finally, none of the models considered here with any of the aforementioned assumptions provide a good fit to the stacked spectral lag data, indicating that there is still missing Physics in the model for intrinsic spectral lags.

show abstract

Spectral Lag for a Radiating Jet Shell with a High-energy Cutoff Radiation Spectrum

Cited by 12 publications

References 70 publications

Constraints on quantum gravity and the photon mass from gamma ray bursts

Constraints on quantum gravity and the photon mass from gamma ray bursts

Constraints on Equivalence Principle Violation from Gamma Ray Bursts

Search for Lorentz Invariance Violation from stacked Gamma-Ray Burst spectral lag data

Contact Info

Product

Resources

About