Limits on Lorentz invariance violation at the Planck energy scale from H.E.S.S. spectral analysis of the blazar Mrk 501

The observation of cosmic neutrinos up to 2 PeV is used to put bounds on the energy scale of Lorentz invariance violation through the loss of energy due to the production of e + e - pairs in the propagation of superluminal neutrinos. A model to study this effect, which allows us to understand qualitatively the results of numerical simulations, is presented.

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Extragalactic background light inhomogeneities and Lorentz-Invariance Violation in gamma-gamma absorption and Compton scattering

Proceedings of the International Astronomical Union ◽

10.1017/s1743921320003361 ◽

2019 ◽

Vol 15 (S356) ◽

pp. 364-364

Author(s):

Hassan Abdalla

Keyword(s):

Compton Scattering ◽

Gamma Ray ◽

Lorentz Invariance ◽

Energy Scale ◽

Fundamental Physics ◽

Extragalactic Background Light ◽

Invariance Violation ◽

Gamma Absorption ◽

The Impact ◽

Planck Energy

AbstractAt energies approaching the Planck energy scale 1019GeV, several quantum-gravity theories predict that familiar concepts such as Lorentz (LIV) symmetry can be broken. Such extreme energies are currently unreachable by experiments on Earth, but for photons traveling over cosmological distances the accumulated deviations from the Lorentz symmetry may be measurable using the Cherenkov Telescope Array (CTA). To study the spectral hardening feature observed in some VHE gamma-ray blazars, we calculate the reduction of the EBL gamma-gamma opacity due to the existence of underdense regions along the line of sight to VHE -gamma ray sources and we compared with the possibility of a LIV signature. Considering the LIV effect, we found that the cosmic opacity for VHE-gamma rays with energy more than 10 TeV can be strongly reduced. I will further discuss the impact of LIV on the Compton scattering process, and how future CTA observations may open an exciting window on studies of the fundamental physics.

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Two-sided constraints on Lorentz invariance violation from Tibet-AS$$\gamma $$ and LHAASO very-high-energy photon observations

The European Physical Journal C ◽

10.1140/epjc/s10052-021-09547-1 ◽

2021 ◽

Vol 81 (8) ◽

Author(s):

Petr Satunin

Keyword(s):

Gamma Ray ◽

Lorentz Invariance ◽

High Energy ◽

Energy Scale ◽

Production Constraints ◽

Invariance Violation ◽

Lorentz Invariance Violation ◽

Very High Energy ◽

Very High ◽

Better Than

AbstractWe present new two-sided constraints on the Lorentz Invariance violation energy scale for photons with quartic dispersion relation from recent gamma ray observations by the Tibet-AS$$\gamma $$ γ and LHAASO experiments. The constraints are based on the consideration of the processes of photon triple splitting (superluminal scenario) and the suppression of shower formation (subluminal). The constraints in the subluminal scenario are better than the pair production constraints and are the strongest in the literature.

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Lorentz invariance violation and modified Hawking fermions tunneling radiation of stationary axially symmetric black holes

Modern Physics Letters A ◽

10.1142/s0217732321500085 ◽

2020 ◽

pp. 2150008

Author(s):

Z. Luo ◽

W. F. Nie ◽

Y. Y. Feng ◽

X. G. Lan

Keyword(s):

Black Hole ◽

Lorentz Invariance ◽

Energy Scale ◽

Axially Symmetric ◽

Tunneling Radiation ◽

Fermions Tunneling ◽

Invariance Violation ◽

Lorentz Invariance Violation ◽

Hamilton Jacobi Equation ◽

Angle Parameter

Based on a higher energy scale, the dispersion relation might be corrected. Correspondingly, the Hamilton–Jacobi equation should also be modified. In this paper, we use the correction to study the fermion tunneling radiation for a Gibbons–Maeda–Garfinkle-Horowitz–Strominger (GMGHS) black hole, a Kerr–NUT black hole, and an Einstein–Maxwell–Dilaton–Axion (EMDA) black hole. The result shows that compared to the charged GMGHS black hole and the rotating Kerr–NUT black hole, the Hawking temperate and the entropy of the rotating charged EMDA black hole not only are related to the correction parameter [Formula: see text] and particle mass [Formula: see text] but also depend on the angle parameter [Formula: see text] of the black hole coordinates.

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