Related papers: Robust constraints on Lorentz Invariance Violation…

A new time-dependent likelihood technique for detection of gamma-ray bursts with IACT arrays

In imaging atmospheric Cherenkov telescope (IACT) arrays, the standard method of statistically inferring the existence of a source is based on the maximum likelihood method of Li&Ma (1983). We present a new statistical approach, also based…

Instrumentation and Methods for Astrophysics · Physics 2019-08-13 Ori M. Weiner

Lorentz invariance violation with gamma rays

The assumption of Lorentz invariance is one of the founding principles of Modern Physics and violation of it would have profound implications to our understanding of the universe. For instance, certain theories attempting a unified theory…

High Energy Astrophysical Phenomena · Physics 2019-08-14 Michael Daniel

Highlights of Galactic Physics with VERITAS

VERITAS (Very Energetic Radiation Imaging Telescope Array System) is one of the most sensitive currently operating arrays of imaging atmospheric Cherenkov telescopes, which detect very high-energy (VHE; E > 100 GeV) gamma rays. VERITAS is…

High Energy Astrophysical Phenomena · Physics 2019-08-16 Gregory T. Richards

Status of the VERITAS Observatory

VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for gammma-ray astronomy in the GeV-TeV range, has recently completed its first season of observations with a full array of four telescopes. A number of astrophysical…

Astrophysics · Physics 2009-11-13 J. Holder , V. A. Acciari , E. Aliu , T. Arlen , M. Beilicke , W. Benbow , S. M. Bradbury , J. H. Buckley , V. Bugaev , Y. Butt , K. L. Byrum , A. Cannon , O. Celik , A. Cesarini , L. Ciupik , Y. C. K. Chow , P. Cogan , P. Colin , W. Cui , M. K. Daniel , T. Ergin , A. D. Falcone , S. J. Fegan , J. P. Finley , G. Finnegan , P. Fortin , L. F. Fortson , A. Furniss , G. H. Gillanders , J. Grube , R. Guenette , G. Gyuk , D. Hanna , E. Hays , D. Horan , C. M. Hui , T. B. Humensky , A. Imran , P. Kaaret , N. Karlsson , M. Kertzman , D. B. Kieda , J. Kildea , A. Konopelko , H. Krawczynski , F. Krennrich , M. J. Lang , S. LeBohec , G. Maier , A. McCann , M. McCutcheon , P. Moriarty , R. Mukherjee , T. Nagai , J. Niemiec , R. A. Ong , D. Pandel , J. S. Perkins , M. Pohl , J. Quinn , K. Ragan , L. C. Reyes , P. T. Reynolds , H. J. Rose , M. Schroedter , G. H. Sembroski , A. W. Smith , D. Steele , S. P. Swordy , J. A. Toner , L. Valcarcel , V. V. Vassiliev , R. Wagner , S. P. Wakely , J. E. Ward , T. C. Weekes , A. Weinstein , R. J. White , D. A. Williams , S. A. Wissel , M. Wood , B. Zitzer

Testing Lorentz Violation Using Propagating UHECRs

Lorentz invariant violation (LIV) test is very important to study in the new physics. All the known astrophysical constraints either have a very small examinable parameter space, or are only suitable for some special theoretical models.…

Astrophysics · Physics 2009-08-07 Cong-Xin Qiu , Zi-Gao Dai

Prospects of performing Lorentz invariance tests with VHE emission from pulsars

Gamma-ray observations provide sensitive tests of Lorentz invariance violation (LIV). At present the most sensitive tests come from observations of transient events, gamma-ray bursts and flaring AGN. Disadvantages of transients are that an…

High Energy Astrophysical Phenomena · Physics 2012-08-13 A. Nepomuk Otte

Search for Lorentz Invariance Violation from stacked Gamma-Ray Burst spectral lag data

A number of works have claimed detections of a turn-over in the spectral lag data for individual Gamma-Ray Bursts (GRBs), caused by an energy-dependent speed of light, which could be a possible manifestation of Lorentz invariance violation…

High Energy Astrophysical Phenomena · Physics 2021-05-13 Rajdeep Agrawal , Haveesh Singirikonda , Shantanu Desai

Constraint on Lorentz invariance violation from Vela pulsar

The High Energy Stereoscopic System (H.E.S.S) Collaboration reported the discovery of a novel radiation component from the Vela pulsar by their Cherenkov telescopes. It is of great importance that gamma rays with energies of at least 20~TeV…

High Energy Astrophysical Phenomena · Physics 2024-04-23 Hao Li , Jie Zhu , Bo-Qiang Ma

Probing Lorentz invariance with a high-energy neutrino flare

Time-of-flight measurements of high-energy astrophysical neutrinos can be used to probe Lorentz invariance, a pillar of modern physics. If Lorentz-invariance violation (LIV) occurs, it could cause neutrinos to slow down, with the delay…

High Energy Astrophysical Phenomena · Physics 2025-07-01 Mauricio Bustamante , John Ellis , Rostislav Konoplich , Alexander S. Sakharov

VERITAS observations of M87 from 2007 to present

M87 is a nearby radio galaxy and because of its misaligned jet, it is possible to correlate detailed spatially-resolved emission regions in the radio, optical to X-ray waveband with unresolved but contemporaneous flux measurements in the…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-13 C. M. Hui

Testing Relativity at High Energies Using Spaceborne Detectors

(ABRIDGED) The Gamma-ray Large Area Space Telescope (GLAST) will measure the spectra of distant extragalactic sources of high energy gamma-rays. GLAST can look for energy dependent propagation effects from such sources as a signal of…

Astrophysics · Physics 2008-11-26 F. W. Stecker

Science Drivers for AGN Observations with the Cherenkov Telescope Array

The current generation of Imaging Atmospheric Cherenkov Telescopes (IACTs), including the H.E.S.S., MAGIC, and VERITAS telescope arrays, have made substantial contributions to our knowledge about the structure and composition of the highly…

High Energy Astrophysical Phenomena · Physics 2012-05-17 Henric Krawczynski

Exploring Lorentz Invariance Violation from Ultra-high-energy Gamma Rays Observed by LHAASO

Recently the LHAASO Collaboration published the detection of 12 ultra-high-energy gamma-ray sources above 100 TeV, with the highest energy photon reaching 1.4 PeV. The first detection of PeV gamma rays from astrophysical sources may provide…

High Energy Astrophysical Phenomena · Physics 2026-01-13 Zhen Cao , F. Aharonian , Q. An , Axikegu , L. X. Bai , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , H. Cai , J. T. Cai , Zhe Cao , J. Chang , J. F. Chang , B. M. Chen , E. S. Chen , J. Chen , Liang Chen , Liang Chen , Long Chen , M. J. Chen , M. L. Chen , Q. H. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , X. L. Chen , Y. Chen , N. Cheng , Y. D. Cheng , S. W. Cui , X. H. Cui , Y. D. Cui , B. D'Ettorre Piazzoli , B. Z. Dai , H. L. Dai , Z. G. Dai , Danzengluobu , D. della Volpe , X. J. Dong , K. K. Duan , J. H. Fan , Y. Z. Fan , Z. X. Fan , J. Fang , K. Fang , C. F. Feng , L. Feng , S. H. Feng , Y. L. Feng , B. Gao , C. D. Gao , L. Q. Gao , Q. Gao , W. Gao , M. M. Ge , L. S. Geng , G. H. Gong , Q. B. Gou , M. H. Gu , F. L. Guo , J. G. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , Y. A. Han , H. H. He , H. N. He , J. C. He , S. L. He , X. B. He , Y. He , M. Heller , Y. K. Hor , C. Hou , X. Hou , H. B. Hu , S. Hu , S. C. Hu , X. J. Hu , D. H. Huang , Q. L. Huang , W. H. Huang , X. T. Huang , X. Y. Huang , Z. C. Huang , F. Ji , X. L. Ji , H. Y. Jia , K. Jiang , Z. J. Jiang , C. Jin , T. Ke , D. Kuleshov , K. Levochkin , B. B. Li , Cheng Li , Cong Li , F. Li , H. B. Li , H. C. Li , H. Y. Li , Jian Li , Jie Li , K. Li , W. L. Li , X. R. Li , Xin Li , Xin Li , Y. Li , Y. Z. Li , Zhe Li , Zhuo Li , E. W. Liang , Y. F. Liang , S. J. Lin , B. Liu , C. Liu , D. Liu , H. Liu , H. D. Liu , J. Liu , J. L. Liu , J. S. Liu , J. Y. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , Y. Liu , Y. N. Liu , Z. X. Liu , W. J. Long , R. Lu , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , J. R. Mao , A. Masood , Z. Min , W. Mitthumsiri , T. Montaruli , Y. C. Nan , B. Y. Pang , P. Pattarakijwanich , Z. Y. Pei , M. Y. Qi , Y. Q. Qi , B. Q. Qiao , J. J. Qin , D. Ruffolo , V. Rulev , A. S'aiz , L. Shao , O. Shchegolev , X. D. Sheng , J. R. Shi , H. C. Song , Yu. V. Stenkin , V. Stepanov , Y. Su , Q. N. Sun , X. N. Sun , Z. B. Sun , P. H. T. Tam , Z. B. Tang , W. W. Tian , B. D. Wang , C. Wang , H. Wang , H. G. Wang , J. C. Wang , J. S. Wang , L. P. Wang , L. Y. Wang , R. N. Wang , W. Wang , W. Wang , X. G. Wang , X. J. Wang , X. Y. Wang , Y. Wang , Y. D. Wang , Y. J. Wang , Y. P. Wang , Z. H. Wang , Z. X. Wang , Zhen Wang , Zheng Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , C. Y. Wu , H. R. Wu , S. Wu , W. X. Wu , X. F. Wu , S. Q. Xi , J. Xia , J. J. Xia , G. M. Xiang , D. X. Xiao , G. Xiao , H. B. Xiao , G. G. Xin , Y. L. Xin , Y. Xing , D. L. Xu , R. X. Xu , L. Xue , D. H. Yan , J. Z. Yan , C. W. Yang , F. F. Yang , J. Y. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , S. B. Yang , Y. H. Yao , Z. G. Yao , Y. M. Ye , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Y. H. Yu , Q. Yuan , H. D. Zeng , T. X. Zeng , W. Zeng , Z. K. Zeng , M. Zha , X. X. Zhai , B. B. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , J. W. Zhang , L. X. Zhang , Li Zhang , Lu Zhang , P. F. Zhang , P. P. Zhang , R. Zhang , S. R. Zhang , S. S. Zhang , X. Zhang , X. P. Zhang , Y. F. Zhang , Y. L. Zhang , Yi Zhang , Yong Zhang , B. Zhao , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , F. Zheng , Y. Zheng , B. Zhou , H. Zhou , J. N. Zhou , P. Zhou , R. Zhou , X. X. Zhou , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , X. Zuo

Probing the sensitivity of CTAO-N LSTs observations at large zenith angles to the multi-TeV gamma-ray emission from the inner 10 parsecs of the Galactic Center

Observations of the Galactic Center using Imaging Atmospheric Cherenkov Telescopes (IACTs), such as H.E.S.S., MAGIC, and VERITAS, have revealed a very-high-energy (VHE, $\gtrsim 100$ GeV) gamma-ray source, HESS J1745$-$290, aligned with the…

High Energy Astrophysical Phenomena · Physics 2025-06-05 Shotaro Abe , Tomohiro Inada , Emmanuel Moulin

An experimental test of gravity at high energy

Gravitational lensing of very high energy photons has recently been observed in the JVAS B0218+357 strong lensing system. This observation opens the possibility of performing a test of gravity at high energy by comparing the difference in…

High Energy Astrophysical Phenomena · Physics 2019-04-11 J-F. Glicenstein

Search for TeV Gamma-Ray Emission from Point-like Sources in the Inner Galactic Plane with a Partial Configuration of the HAWC Observatory

A survey of the inner Galaxy region of Galactic longitude l in [+15, +50] degree and latitude b in [-4,+4] degree is performed using one-third of the High Altitude Water Cherenkov (HAWC) Observatory operated during its construction phase.…

High Energy Astrophysical Phenomena · Physics 2016-01-27 A. U. Abeysekara , R. Alfaro , C. Alvarez , J. D. Álvarez , R. Arceo , J. C. Arteaga-Velázquez , H. A. Ayala Solares , A. S. Barber , B. M. Baughman , N. Bautista-Elivar , A. D. Becerril Reyes , E. Belmont , S. Y. BenZvi , A. Bernal , J. Braun , K. S. Caballero-Mora , T. Capistrán , A. Carramiñana , S. Casanova , M. Castillo , U. Cotti , J. Cotzomi , S. Coutiño de León , E. de la Fuente , C. De León , T. DeYoung , B. L. Dingus , M. A. DuVernois , R. W. Ellsworth , O. Enriquez-Rivera , D. W. Fiorino , N. Fraija , F. Garfias , M. M. González , J. A. Goodman , M. Gussert , Z. Hampel-Arias , J. P. Harding , S. Hernandez , P. Hüntemeyer , C. M. Hui , A. Imran , A. Iriarte , P. Karn , D. Kieda , A. Lara , R. J. Lauer , W. H. Lee , D. Lennarz , H. León Vargas , J. T. Linnemann , M. Longo , G. Luis Raya , K. Malone , A. Marinelli , S. S. Marinelli , H. Martinez , O. Martinez , J. Martínez-Castro , J. A. J. Matthews , P. Miranda-Romagnoli , E. Moreno , M. Mostafá , L. Nellen , M. Newbold , R. Noriega-Papaqui , B. Patricelli , R. Pelayo , E. G. Pérez-Pérez , J. Pretz , Z. Ren , C. Rivière , D. Rosa-González , H. Salazar , F. Salesa Greus , A. Sandoval , M. Schneider , G. Sinnis , A. J. Smith , K. Sparks Woodle , R. W. Springer , I. Taboada , O. Tibolla , K. Tollefson , I. Torres , T. N. Ukwatta , L. Villaseñor , K. Vrabel , T. Weisgarber , S. Westerhoff , I. G. Wisher , J. Wood , T. Yapici , G. B. Yodh , P. W. Younk , D. Zaborov , A. Zepeda , H. Zhou

Constraints on Lorentz Invariance Violating Quantum Gravity and Large Extra Dimensions Models using High Energy Gamma Ray Observations

Observations of the multi-TeV spectra of the nearby BL objects Mkn 421 and Mkn 501 exhibit the high energy cutoffs predicted to be the result of intergalactic annihilation interactions, primarily with infrared photons having a flux level as…

Astrophysics · Physics 2015-06-24 F. W. Stecker

Joint searches by FACT, H.E.S.S., MAGIC and VERITAS for VHE gamma-ray emission associated with neutrinos detected by IceCube

The sources of the astrophysical flux of high-energy neutrinos detected by IceCube are still largely unknown, but searches for temporal and spatial correlation between neutrinos and electromagnetic radiation are a promising approach in this…

High Energy Astrophysical Phenomena · Physics 2023-09-28 Fabian Schüssler , Halim Ashkar , Elisa Bernardini , Alessio Berti , Federica Bradascio , Sara Buson , Daniela Dorner , Weidong Jin , Gasper Kukec Mezek , Marcos Santander , Konstancja Satalecka , Bernd Schleicher , Mohanraj Senniappan , Ilaria Viale

Study of Lorentz violation in INTEGRAL Gamma-Ray Bursts

We search for possible time lags caused by quantum gravitational (QG) effects using gamma-ray bursts (GRBs) detected by INTEGRAL. The advantage of this satellite is that we have at our disposal the energy and arrival time of every detected…

General Relativity and Quantum Cosmology · Physics 2008-11-26 Raphael Lamon , Nicolas Produit , Frank Steiner

Probing Lorentz Invariance Violation at High Energies Using LHAASO Observations of GRB221009A via DisCan Algorithm

The Lorentz invariance violation (LIV) predicted by some quantum gravity theories would manifest as an energy-dependent speed of light, which may potentially distort the observed temporal profile of photons from astrophysical sources at…

High Energy Astrophysical Phenomena · Physics 2025-11-10 Yu-Chen Hua , Xiao-Jun Bi , Yu-Ming Yang , Peng-Fei Yin