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Related Experiment Videos

Exploring Lorentz Invariance Violation from Ultrahigh-Energy γ Rays Observed by LHAASO.

Zhen Cao1,2,3, F Aharonian4,5, Q An6,7

  • 1Key Laboratory of Particle Astrophysics and Experimental Physics Division and Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, 100049 Beijing, China.

Physical Review Letters
|February 18, 2022
PubMed

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Summary
This summary is machine-generated.

Researchers found no evidence of Lorentz invariance violation (LIV) in ultrahigh-energy gamma-ray data from the LHAASO Collaboration. This study sets new, stringent limits on the LIV energy scale, improving previous results.

Area of Science:

  • * Astroparticle physics
  • * High-energy astrophysics
  • * Quantum gravity phenomenology

Background:

  • * The LHAASO Collaboration detected 12 ultrahigh-energy gamma-ray sources above 100 TeV.
  • * The highest energy photon detected reached 1.4 PeV.
  • * PeV gamma rays offer a sensitive probe for Lorentz Invariance Violation (LIV).

Purpose of the Study:

  • * To investigate the potential effects of LIV on ultrahigh-energy gamma-ray spectra.
  • * To derive new lower limits on the LIV energy scale using the highest energy gamma-ray data.
  • * To improve upon existing constraints on LIV by at least an order of magnitude.

Main Methods:

  • * Analysis of energy spectra from the two highest energy gamma-ray sources detected by LHAASO.
  • * Searching for spectral cutoffs indicative of LIV-induced photon decay.

Related Experiment Videos

  • * Derivation of lower bounds on the LIV energy scale based on observational data.

    • Main Results:

    • * No signature of Lorentz Invariance Violation (LIV) was detected in the energy spectra of the studied sources.
    • * The lower limit for the first-order LIV energy scale was established at >10^5 MPl.
    • * The lower limit for the second-order LIV energy scale was found to be >10^-3 MPl.

    Conclusions:

    • * The absence of LIV signatures in PeV gamma rays provides strong constraints on theories predicting such effects.
    • * The derived limits significantly enhance our understanding of fundamental physics at extreme energy scales.
    • * This study pushes the frontier of testing quantum gravity effects using astrophysical observations.