scholarly journals Inspecting absorption in the spectra of extra-galactic gamma-ray sources for insight into Lorentz invariance violation

2008 ◽  
Vol 78 (12) ◽  
Author(s):  
Uri Jacob ◽  
Tsvi Piran
Keyword(s):  
Gamma Ray ◽  
Lorentz Invariance ◽  
Invariance Violation ◽  
Lorentz Invariance Violation ◽  
Insight Into

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

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 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 ) .

COSMOLOGICAL MEASUREMENTS OF LORENTZ INVARIANCE VIOLATION AT THE LIFŠHITZ POINT

2012 ◽  
Vol 21 (08) ◽  
pp. 1250070 ◽  
Author(s):  
ORLANDO LUONGO ◽  
DAMIANO TOMMASINI
Keyword(s):  
Gamma Ray ◽  
Lorentz Invariance ◽  
A Priori ◽  
Planck Scale ◽  
Chaplygin Gas ◽  
Einstein Equations ◽  
Lifshitz Point ◽  
Invariance Violation ◽  
Lorentz Invariance Violation ◽  
Neutrino Fluxes

We consider the neutrino fluxes and photon lensing from Gamma Ray Bursts and galaxy shocks, in order to predict measurable quantum corrections at late times. In particular, changes of the Einstein shell condition are expected to modify the time delay of neutrinos and photons at the Planck scale. Hence, we study the consequences of the Lorentz invariance violation through the use of such photons and neutrinos. The Lorentz invariance violation is expected to depend on the cosmological model, considered a priori in the Einstein equations; therefore, we focus on the so-called Hořava model which has recently attracted great interest. In addition, we compare our results with the ΛCDM and modified Chaplygin gas models, respectively. We infer several theoretical constraints which could reveal such quantum gravity effects.

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

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.

scholarly journals A Robust Estimation of Lorentz Invariance Violation and Intrinsic Spectral Lag of Short Gamma-Ray Bursts

2022 ◽  
Vol 924 (2) ◽  
pp. L29
Author(s):  
Shuo Xiao ◽  
Shao-Lin Xiong ◽  
Yue Wang ◽  
Shuang-Nan Zhang ◽  
He Gao ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Lorentz Invariance ◽  
Propagation Speed ◽  
Gamma Ray Bursts ◽  
Energy Bands ◽  
Photon Propagation ◽  
Invariance Violation ◽  
Lorentz Invariance Violation ◽  
Spectral Lag ◽  
Wide Energy

Abstract Gamma-ray bursts (GRBs) have been identified as one of the most promising sources for Lorentz invariance violation (LIV) studies due to their cosmological distance and energetic emission in wide energy bands. However, the arrival-time difference of GRB photons among different energy bands is affected not only by the LIV effect but also by the poorly known intrinsic spectral lags. In previous studies, assumptions of spectral lag have to be made which could introduce systematic errors. In this paper, we used a sample of 46 short GRBs (SGRBs), whose intrinsic spectra lags are much smaller than long GRBs, to better constrain the LIV. The observed spectral lags are derived between two fixed energy bands in the source rest frame rather than the observer frame. Moreover, the lags are calculated with the novel Li–CCF method, which is more robust than traditional methods. Our results show that, if we consider LIV as a linear energy dependence of the photon propagation speed in the data fit, then we obtain a robust limit of E QG > 1015 GeV (95% CL). If we assume no LIV effect in the keV–MeV energy range, the goodness of data fit is equivalently as well as the case with LIV and we can constrain the common intrinsic spectral lags of SGRBs to be 1.4 ± 0.5 ms (1σ), which is the most accurate measurement thus far.

Sign in / Sign up

Export Citation Format

Share Document