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Article
Astronomy & Astrophysics
M. M. Gonzalez et al.
Summary: Gamma-ray bursts (GRBs) have the potential to emit very high energy photons due to the large energy release and strong magnetic fields. The recent observation of 18 and 251 TeV photons from GRB 221009A challenges our understanding of teraelectronvolt emission mechanisms and the extragalactic background. Researchers have started exploring dark matter candidates to explain these observations. This paper discusses the conditions and limitations of the synchrotron self-Compton radiation scenario in the GRB afterglow to interpret the 18 TeV photon. Possible scenarios involving axion-like particles (ALPs) and dark photon mechanisms are explored. The ALPs and dark photon scenarios can explain the 18 TeV photon but not the 251 TeV photon.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Jihong Huang et al.
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.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Nuclear
Vedran Brdar et al.
Article
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.
Article
Physics, Particles & Fields
Shao-Ping Li et al.
Summary: In the early universe, Dirac neutrino magnetic moments due to their chirality-flipping nature could lead to thermal production of right-handed neutrinos, which would make a significant contribution to the effective neutrino number, N-eff. We present in this paper a dedicated computation of the neutrino chirality-flipping rate in the thermal plasma. With a careful and consistent treatment of soft scattering and the plasmon effect in finite temperature field theories, we find that neutrino magnetic moments above 2.7 x 10(-12)mu(B) have been excluded by current CMB and BBN measurements of N-eff, assuming flavor-universal and diagonal magnetic moments for all three generation of neutrinos. This limit is stronger than the latest bounds from XENONnT and LUX-ZEPLIN experiments and comparable with those from stellar cooling considerations.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Saikat Das et al.
Summary: This research finds that conventional leptonic models cannot explain the observation of gamma rays above 10 TeV detected by the LHAASO detector. An additional component is required in the energy range equal to or greater than 10 TeV. The study further suggests that ultrahigh-energy cosmic rays can be accelerated in the blast wave of gamma-ray bursts, and their propagation induces an electromagnetic cascade in the extragalactic medium, which can explain the emission above 10 TeV detected by LHAASO. This could be an indication of ultrahigh-energy cosmic-ray acceleration in gamma-ray bursts.
ASTRONOMY & ASTROPHYSICS
(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
Astronomy & Astrophysics
Shyam Balaji et al.
Summary: The recent astrophysical transient Swift J1913.1 at a redshift of z ≈ 0.151 may be associated with the γ-ray burst GRB 221009A. Very high-energy γ rays (up to 18 TeV) were observed following the transient, which is unexpected as photons of such high energy should annihilate with the diffuse extragalactic background light (EBL) before reaching Earth. This paper presents a CP-even scalar model to explain the 18 TeV event, proposing that highly boosted scalar particles are produced in the GRB and then undergo radiative decay while propagating to Earth, allowing the resulting photons to be produced without being nullified by the EBL.
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
Multidisciplinary Sciences
Maxim Khlopov
Summary: The field of cosmoparticle physics explores the relationship between the universe and particle physics, focusing on non-standard features of dark matter cosmology related to BSM physics. This interdisciplinary study utilizes methods such as studying primordial black holes, antimatter stars, and composite dark matter to investigate BSM models and their parameters.
Article
Astronomy & Astrophysics
Vedran Brdar et al.
Summary: This study focuses on the physics of neutrino magnetic moments, particularly in scenarios where right-handed or sterile neutrinos are heavier than left-handed Standard Model neutrinos. Strong exclusion limits on the active-to-sterile neutrino transition magnetic moment are derived based on data from various sources and experiments. Complementary constraints from astrophysics and cosmology are also investigated, along with a thorough analysis of Big Bang nucleosynthesis.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Correction
Astronomy & Astrophysics
N. Aghanim et al.
ASTRONOMY & ASTROPHYSICS
(2021)
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Astronomy & Astrophysics
N. Aghanim et al.
ASTRONOMY & ASTROPHYSICS
(2020)
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Physics, Particles & Fields
Patrick D. Bolton et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Multidisciplinary
P. Adamson et al.
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
Nikita Blinov et al.
PHYSICAL REVIEW LETTERS
(2019)
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Astronomy & Astrophysics
Alberto Franceschini et al.
ASTRONOMY & ASTROPHYSICS
(2017)
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M. Agostini et al.
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Astronomy & Astrophysics
Hendrik Vogel et al.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2014)
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Astronomy & Astrophysics
Celine Boehm et al.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2012)
Article
Astronomy & Astrophysics
A. Dominguez et al.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2011)
