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 Improved limits on Lorentz invariance violation from astrophysical gamma-ray sources

2019 ◽  
Vol 99 (4) ◽  
Author(s):  
Rodrigo Guedes Lang ◽  
Humberto Martínez-Huerta ◽  
Vitor de Souza
Keyword(s):  
Gamma Ray ◽  
Lorentz Invariance ◽  
Invariance Violation ◽  
Lorentz Invariance Violation

A SHORT, CRITICAL REVIEW ON GAMMA-RAY EMISSION FROM GALAXY CLUSTERS

2009 ◽  
Vol 18 (10) ◽  
pp. 1541-1544
Author(s):  
SERGIO COLAFRANCESCO
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Cosmic Rays ◽  
Galaxy Clusters ◽  
Critical Review ◽  
Particle Physics ◽  
Gamma Ray ◽  
Gamma Ray Emission ◽  
The Impact

We discuss the relevance of gamma-ray observations of galaxy clusters, to unveil several issues that are relevant for Cosmology and Astro-Particle Physics of cosmic structures: the nature of Dark Matter, the origin of cosmic rays and the impact of black holes.

scholarly journals Gamma ray burst constraints on ultraviolet Lorentz invariance violation

2006 ◽  
Vol 643 (2) ◽  
pp. 81-85 ◽  
Author(s):  
Tina Kahniashvili ◽  
Grigol Gogoberidze ◽  
Bharat Ratra
Keyword(s):  
Gamma Ray ◽  
Lorentz Invariance ◽  
Gamma Ray Burst ◽  
Invariance Violation ◽  
Lorentz Invariance Violation

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 Constraints on Hořava–Lifshitz gravity from GRB 170817A

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
Tao Zhang ◽  
Fu-Wen Shu ◽  
Qing-Wen Tang ◽  
Dong-Hui Du
Keyword(s):  
Electromagnetic Waves ◽  
Gamma Ray ◽  
Lorentz Invariance ◽  
Ideal Case ◽  
Remarkable Feature ◽  
Invariance Violation ◽  
Stringent Constraint ◽  
Lorentz Invariance Violation ◽  
Em Field ◽  
Kaluza Klein

AbstractIn this work we focus on a toy model: ($$3+1$$ 3 + 1 )-dimensional Hořava–Lifshitz gravity coupling with an anisotropic electromagnetic (EM) field which is generated through a Kaluza-Klein reduction of a ($$4+1$$ 4 + 1 )-dimensional Hořava–Lifshitz gravity. This model exhibits a remarkable feature that it has the same velocity for both gravitational and electromagnetic waves. This feature makes it possible to restrict the parameters of the theory from GRB 170817A. In this work we use this feature to discuss possible constraints on the parameter $$\beta $$ β in the theory, by analyzing the possible Lorentz invariance violation effect of the GRB 170817A. This is achieved by analyzing potential time delay of gamma-ray photons in this event. It turns out that it places a stringent constraint on this parameter. In the most ideal case, it gives $$|1-\sqrt{\beta }|<(10^{-19}-10^{-18})$$ | 1 - β | < ( 10 - 19 - 10 - 18 ) .

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