Possible Evidence for Lorentz Invariance Violation in Gamma-Ray Burst 221009A

Finke, J.; Razzaque, S.

doi:10.3847/2041-8213/acade1

Cited by 35 publications

(19 citation statements)

References 57 publications

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“…Based on a comparison of the observed a interpolated spectrum at 18 TeV, a 95% c.l. upper limit on the opacity (τ) , given by τ ≤ 17 was obtained [190]. This constraint is consistent with only a small fraction of models of extragalactic background light [191].…”

Section: Searches Based On Tev-pev Observationssupporting

confidence: 57%

“…Again this result is in conflict with the lower limits obtained in [147]. However, this result also has a number of caveats associated with it as discussed in [190], from prosaic astrophysical assumptions [195] to other exotic Physics, which could explain the disappearance of photons [196]. This result should soon be confirmed with more detections from LHAASO, HAWC, and the upcoming Cherenkov Telescope Array, which could detect VHE emission from GRBs upto 100s of TeV.…”

Section: Searches Based On Tev-pev Observationsmentioning

confidence: 92%

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Astrophysical and Cosmological Searches for Lorentz Invariance Violation

Desai¹

2023

Preprint

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Lorentz invariance is one of the fundamental tenets of Special Relativity, and has been extensively tested with laboratory and astrophysical observations. However, many quantum gravity models and theories beyond the Standard Model of Particle Physics predict a violation of Lorentz invariance at energies close to Planck scale. This article reviews observational and experimental tests of Lorentz invariance violation (LIV) with photons, neutrinos and gravitational waves. Most astrophysical tests of LIV using photons are based on searching for a correlation of the spectral lag data with redshift and energy. These have been primarily carried out using compact objects such as pulsars, Active Galactic Nuclei (AGN), and Gamma-ray bursts (GRB). There have also been some claims for LIV from some of these spectral lag observations with GRBs, which however are in conflict with the most stringent limits obtained from other LIV searches. Searches have also been carried out using polarization measurements from GRBs and AGNs. For neutrinos, tests have been made using both astrophysical observations at MeV energies (from SN 1987A) as well as in the TeV-PeV energy range based on IceCube observations, atmospheric neutrinos, and long-baseline neutrino oscillation experiments. Cosmological tests of LIV entail looking for a constancy of the speed of light as a function of redshift using multiple observational probes, as well as looking for birefringence in Cosmic Microwave background observations. This article will review all of these aforementioned observational tests of LIV, including results which are in conflict with each other.

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Section: Searches Based On Tev-pev Observationssupporting

confidence: 57%

Section: Searches Based On Tev-pev Observationsmentioning

confidence: 92%

Astrophysical and Cosmological Searches for Lorentz Invariance Violation

Desai¹

2023

Preprint

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“…This is corresponding to the radiation luminosity greater than ∼6.5 × 10 53 erg s −1 at ∼18 TeV. Some possibilities can explain this phenomenon, such as hadronic processes (e.g., synchrotron radiation of protons; Aharonian 2000;Alves et al 2018), Lorentz invariance violation (LIV), and axion-like particles (e.g., Galanti et al 2022;Nakagawa et al 2023;Finke & Razzaque 2023;Li & Ma 2023), or the need for corrections to the EBL field of low-energy photons.…”

Section: Spectral Energy Distributionmentioning

confidence: 97%

The Possibility of Modeling the Very High Energy Afterglow of GRB 221009A in a Wind Environment

Ren

Wang

Zhang

et al. 2023

ApJ

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In this paper, we model the dynamics and radiation physics of the rarity event GRB 221009A afterglow in detail. By introducing a top-hat jet that propagates in an environment dominated by stellar winds, we explain the publicly available observations of afterglow associated with GRB 221009A over the first week. It is predicted that GRB 221009A emits a luminous very high energy afterglow based on the synchrotron self-Compton (SSC) process in our model. We show the broadband spectral energy distribution (SED) analysis results of GRB 221009A and find that the SSC radiation component of GRB 221009A is very bright in the 0.1–10 TeV band. The integrated SED shows that the SSC emission in the TeV band has detection sensitivity significantly higher than that of LHASSO, MAGIC, and CTA. However, since the release of further observations, deviations from the standard wind environment model have gradually shown up in data. For example, the late-time multiband afterglow cannot be consistently explained under the standard wind environment scenario. It may be necessary to consider modeling with a structured jet with complex geometry or a partial revision of the standard model. Furthermore, we find that the inclusion of GeV observations could break the degeneracy between model parameters, highlighting the significance of high-energy observations in determining accurate parameters for GRB afterglows.

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“…Additionally, these energetic photons could be explained by the line of sight component of this flux. Some studies also explore Lorentz Invariance violation effects on gammagamma absorption (Finke & Razzaque 2023;Li & Ma 2022;Zheng et al 2022).…”

Section: Introductionmentioning

confidence: 99%

GRB 221009A: A Light Dark Matter Burst or an Extremely Bright Inverse Compton Component?

González

Rojas

Pratts

et al. 2023

ApJ

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Gamma-ray bursts (GRBs) have been considered as potential very high energy photon emitters due to the large amount of energy released as well as the strong magnetic fields involved in their jets. However, the detection of teraelectronvolt photons is not expected from bursts beyond a redshift of z ≳ 0.1, due to their attenuation with the extragalactic background light (EBL). For these reasons, the recent observation of photons with energies of 18 and 251 TeV from GRB 221009A (z = 0.151) last 2022 October 9 has challenged what we know about the teraelectronvolt-emission mechanisms and the extragalactic background. In order to explain the teraelectronvolt observations, recent works exploring candidates of dark matter have started to appear. In this paper, we discuss the required conditions and limitations within the most plausible scenario, synchrotron self-Compton radiation in the GRB afterglow, to interpret the one 18 TeV photon observation besides the EBL. To avoid the Klein–Nishina effect, we find an improbable value of the microphysical magnetic parameter below 10−6 for a circumburst medium value >1 cm−3 (expected in the collapsar scenario). Therefore, we explore possible scenarios in terms of axion-like particles (ALPs) and dark photon mechanisms to interpret this highly energetic photon and we discuss the implications in the GRB energetics. We find that the ALPs and dark photon scenarios can explain the 18 teraelectronvolt photon but not the 251 teraelectronvolt photon.

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Possible Evidence for Lorentz Invariance Violation in Gamma-Ray Burst 221009A

Cited by 35 publications

References 57 publications

Astrophysical and Cosmological Searches for Lorentz Invariance Violation

Astrophysical and Cosmological Searches for Lorentz Invariance Violation

The Possibility of Modeling the Very High Energy Afterglow of GRB 221009A in a Wind Environment

GRB 221009A: A Light Dark Matter Burst or an Extremely Bright Inverse Compton Component?

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