scholarly journals Lorentz Invariance Violation Tests in Astroparticle Physics

Symmetry ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1232
Author(s):  
Humberto Martínez-Huerta ◽  
Rodrigo Guedes Lang ◽  
Vitor de Souza
Keyword(s):  
Lorentz Invariance ◽  
Time Lag ◽  
Astroparticle Physics ◽  
Production Threshold ◽  
Air Shower ◽  
Photon Decay ◽  
Invariance Violation ◽  
Lorentz Invariance Violation ◽  
Photon Splitting ◽  
Energy Dependent

In this review, we present the latest exclusion limits obtained from astroparticles on Lorentz Invariance Violation (LIV) in the photon sector. We discuss the techniques known as energy-dependent time delay or time lag, subluminal pair production threshold shift, suppression of air shower formation, superluminal photon decay, and superluminal photon splitting. Perspectives for future results on LIV with the next generation of experiments are also addressed.

scholarly journals New constraints on Lorentz Invariance violation from Crab Nebula spectrum beyond 100 TeV

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
Petr Satunin
Keyword(s):  
Quantum Electrodynamics ◽  
Gamma Ray ◽  
Crab Nebula ◽  
Lorentz Invariance ◽  
Mass Scale ◽  
Photon Decay ◽  
Link Type ◽  
Invariance Violation ◽  
Lorentz Invariance Violation ◽  
Photon Splitting

AbstractRecently two collaborations, Tibet and HAWC, presented new measurements of gamma-ray spectrum from Crab Nebula (Amenomori et al. in Phys Rev Lett 123(5):051101, 2019, arXiv:1906.05521 [astro-ph.HE]; Abeysekara et al. [HAWC Collaboration] in Astrophys. J. 881, 134, (2019), arXiv:1905.12518 [astro-ph.HE]) which continues beyond 100 TeV. We use these data to establish two-sided constraints on parameters of Lorentz Invariance violation in quantum electrodynamics. The limits on Lorentz violating mass scale for quartic dispersion relation are $$4.1\times 10^{14}\, \text{ GeV }$$4.1×1014GeV (photon splitting) and $$1.9\times 10^{13}\, \text{ GeV }$$1.9×1013GeV (photon decay) for superluminal case, and $$1.4\times 10^{12}$$1.4×1012 GeV (suppression of shower formation) for subluminal case.

scholarly journals Modeling spectral lags in active galactic nucleus flares in the context of Lorentz invariance violation searches

2020 ◽  
Vol 633 ◽  
pp. A143 ◽  
Author(s):  
C. Perennes ◽  
H. Sol ◽  
J. Bolmont
Keyword(s):  
Lorentz Invariance ◽  
High Energy ◽  
Physical Parameters ◽  
New Era ◽  
Invariance Violation ◽  
Quantum Gravity Phenomenology ◽  
Lorentz Invariance Violation ◽  
Very High Energy ◽  
Energy Dependent ◽  
New Generation

Context. High-energy photons emitted by flaring active galactic nuclei (AGNs) have been used for many years to constrain modified dispersion relations in vacuum encountered in the context of quantum gravity phenomenology. In such studies, done in the GeV–TeV range, energy-dependent delays (spectral lags) are searched for, usually neglecting any source-intrinsic time delay. Aims. With the aim being to distinguish Lorentz invariance violation (LIV) effects from lags generated at the sources themselves, a detailed investigation into intrinsic spectral lags in flaring AGNs above 100 GeV is presented in the frame of synchrotron-self-Compton scenarios for their very-high-energy (VHE) emission. Methods. A simple model of VHE flares in blazars is proposed, allowing to explore the influence of the main physical parameters describing the emitting zones on intrinsic delays. Results. For typical conditions expected in TeV blazars, significant intrinsic lags are obtained, which can dominate over LIV effects, especially at low redshifts, and should therefore be carefully disentangled from any extrinsic lags. Moreover, two main regimes are identified with characteristic spectral lags, corresponding to long-lasting and fast particle acceleration. Conclusions. Such intrinsic spectral lags should be detected with new-generation instruments at VHE such as the Cherenkov Telescope Array which begins operation in a few years. This will provide original constraints on AGN flare models and open a new era for LIV searches in the photon sector.

scholarly journals Recent Results from the High Altitude Water Cherenkov Observatory

2020 ◽  
Vol 235 ◽  
pp. 07001
Author(s):  
Kelly Malone
Keyword(s):  
Dark Matter ◽  
Cosmic Rays ◽  
High Altitude ◽  
Particle Physics ◽  
Gamma Ray ◽  
Lorentz Invariance ◽  
Air Shower ◽  
Invariance Violation ◽  
Lorentz Invariance Violation ◽  
The Future

The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory, anextensive air shower detector consisting of 300 water Cherenkov tanks located at 4100m in Puebla, Mexico, has been surveying the TeV gamma-ray sky for almost five years. HAWC can observe steady sources, variable sources, transients, which allows for probes of both astrophysical and particle physics phenomena. This includes the production and propagation of cosmic rays, studies of Lorentz invariance violation, and dark matter searches. I will discuss recent HAWC results as well as the future of the observatory.

scholarly journals Probing Quantum Gravity with Imaging Atmospheric Cherenkov Telescopes

Universe ◽  
2021 ◽  
Vol 7 (9) ◽  
pp. 345
Author(s):  
Tomislav Terzić ◽  
Daniel Kerszberg ◽  
Jelena Strišković
Keyword(s):  
Quantum Gravity ◽  
Historical Development ◽  
Lorentz Invariance ◽  
High Energy ◽  
Cherenkov Telescopes ◽  
Analysis Methods ◽  
Invariance Violation ◽  
Lorentz Invariance Violation ◽  
Comparison Of The Results ◽  
Energy Dependent

High energy photons from astrophysical sources are unique probes for some predictions of candidate theories of Quantum Gravity (QG). In particular, Imaging atmospheric Cherenkov telescope (IACTs) are instruments optimised for astronomical observations in the energy range spanning from a few tens of GeV to ∼100 TeV, which makes them excellent instruments to search for effects of QG. In this article, we will review QG effects which can be tested with IACTs, most notably the Lorentz invariance violation (LIV) and its consequences. It is often represented and modelled with photon dispersion relation modified by introducing energy-dependent terms. We will describe the analysis methods employed in the different studies, allowing for careful discussion and comparison of the results obtained with IACTs for more than two decades. Loosely following historical development of the field, we will observe how the analysis methods were refined and improved over time, and analyse why some studies were more sensitive than others. Finally, we will discuss the future of the field, presenting ideas for improving the analysis sensitivity and directions in which the research could develop.

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