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Article
Astronomy & Astrophysics
Hao Li et al.
Summary: It has been reported that the Large High Altitude Air Shower Observatory (LHAASO) has observed extremely high-energy photons from GRB 221009A, with the maximum energy reaching 18 TeV. This observation is challenging due to the absorption of these photons by extragalactic background light and the weak flux. Therefore, a potential explanation for this phenomenon is proposed based on Lorentz invariance violation induced threshold anomaly in the process yy -> e-e+.
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Summary: Recently, the LHAASO collaboration has observed gamma rays with energies up to ten TeV from the gamma-ray burst GRB221009A, generating interest in the astronomy, particle physics, and astrophysics communities for possible interpretations. In this paper, a plausible scenario is proposed where neutrinos are produced alongside TeV photons in the gamma-ray burst and subsequently decay into axion-like particles, which then convert into gamma rays in the galactic magnetic fields. This scenario helps alleviate the tension between previous interpretations of axion-like particles and the observational constraints on relevant coupling constant and mass.
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(2023)
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Summary: Einstein's relativity theory proposes that the speed of light in vacuum is constant for all observers. However, studies on high-energy photon events from gamma-ray bursts and active galactic nuclei suggest a variation in light speed due to quantum gravity. The newly observed gamma-ray burst GRB 221009A reveals a 99.3 GeV photon that coincides with a sharp spike in the light curves, indicating a possible emission of high-energy and low-energy photons occurring simultaneously.
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Astronomy & Astrophysics
Shota Nakagawa et al.
Summary: This study investigates the behavior of an axion-like particle (ALP) that goes through a first-order phase transition in terms of its mass or potential minimum. It is observed that if the ALP obtains a potential from non-perturbative effects of SU(N) gauge theory confined via the first-order phase transition, similar dynamics can be achieved as in the trapped misalignment mechanism. The enhanced ALP abundance in this mechanism provides an explanation for dark matter and is accessible to experiments such as IAXO, ALPS-II, and DM-radio.
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Astronomy & Astrophysics
L. Dirson et al.
Summary: The Crab Nebula emits bright non-thermal radiation across all wavelengths, from radio to the most energetic photons. This study aims to determine the strength and radial dependence of the magnetic field in the nebula using recent measurements and improved spectroscopy. A radiative model was used to calculate the emission from non-thermal electrons and thermal dust, and the spatial dependence of the electron and seed field density was considered. The results suggest that the energy density of the magnetic field dominates over the particle energy density up to a certain distance, challenging previous estimations and suggesting the need for additional mechanisms to slow down the flow.
ASTRONOMY & ASTROPHYSICS
(2023)
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Astronomy & Astrophysics
Justin D. D. Finke et al.
Summary: The preliminary detections of gamma-ray burst 221009A up to 18 TeV by LHAASO and up to 251 TeV by Carpet 2 have been reported. Although these photons initially seem to have a low probability of surviving pair production and reaching Earth due to their redshift, extrapolating the Fermi Large Area Telescope spectrum indicates that the survival of the 18 TeV photon is not unlikely with recent background light models. However, the detection of a 251 TeV event is still very unlikely, unless there is a violation of Lorentz invariance at certain energy scales.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Physics, Multidisciplinary
Guangshuai Zhang et al.
Summary: The Large High Altitude Air Shower Observatory (LHAASO) has detected a large number of multi-TeV-scale photon events, including several PeV-scale gamma-ray-photon events with energy as high as 1.4 PeV. There is a possibility that some of these events may have extragalactic origins. A proposed mechanism based on axion-photon conversion scenario explains the traveling of very-high-energy and ultra-high-energy photons, allowing their detection on Earth. This mechanism serves as an alternative explanation, along with Lorentz invariance violation, for the very-high-energy features of the newly observed gamma ray burst GRB 221009A.
CHINESE PHYSICS LETTERS
(2023)
Article
Physics, Particles & Fields
Hao Li et al.
Summary: In this work, the effect of Lorentz invariance violation (LIV) on cosmic photon attenuations by extragalactic background light (EBL) is studied, and the identification of LIV from observations of very high energy (VHE) photons propagated from long distance is discussed. It is pointed out that the Large High Altitude Air Shower Observatory (LHAASO) is an ideal facility for performing such LIV searching. The proposed strategy is applied to analyze the newly observed gamma-ray burst GRB 221009A to demonstrate the predictive ability.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Multidisciplinary
S. V. Troitsky
Summary: The recent astrophysical transient is possibly associated with a gamma-ray burst, but the data requires new physics due to the presence of cosmic background radiation. One possibility is the interaction between axion-like particles and photons, which may occur in the Milky Way instead of intergalactic space. However, the event's low Galactic latitude leaves room for misidentification with a Galactic transient.
Article
Physics, Particles & Fields
Leonardo Mastrototaro et al.
Summary: The detection of high-energy neutrinos supports the existence of gamma rays from cosmic accelerators. The interaction between photons and ultra-light axion-like particles (ALPs) allows for the conversion of ALPs into high-energy photons. The recent observations from LHAASO provide evidence for the existence of this conversion process. This new result is important for our understanding of the universe and fundamental particle physics.
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(2022)
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Astronomy & Astrophysics
C. Eckner et al.
Summary: Experimental refinements and technical innovations in the field of extensive air shower telescopes have enabled measurements of Galactic cosmic-ray interactions in the sub-PeV range, providing new avenues for the search for new physics and dark matter. By observing Galactic diffuse gamma rays in the sub-PeV range and studying the ALP-induced gamma-ray signal related to high-energy neutrino flux, competitive upper limits on the photon-ALP coupling constant were set, closing the mass gap toward ADMX limits.
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Christopher Dessert et al.
Summary: Polarization measurements of thermal radiation from magnetic white dwarf stars can serve as a probe of axion-photon mixing, with constraints on the axion-photon coupling strength. Observations of multiple magnetic white dwarfs have placed an upper limit on this coupling, impacting previous explanations for the transparency of the Universe to TeV gamma-rays in terms of axions.
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Astronomy & Astrophysics
Xiaojun Bi et al.
Summary: Observations of cosmic sub-PeV gamma rays from the Crab Nebula allow testing of cosmic ray photon transparency at multi-hundred-TeV scale, providing constraints on new physics effects. By combining different datasets, constraints on axionlike particles and dark photon dark matter can be determined.
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