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Title: Constraints on Lorentz invariance violation from Fermi -Large Area Telescope observations of gamma-ray bursts

For this research, we analyze the MeV/GeV emission from four bright gamma-ray bursts (GRBs) observed by the Fermi Large Area Telescope to produce robust, stringent constraints on a dependence of the speed of light in vacuo on the photon energy (vacuum dispersion), a form of Lorentz invariance violation (LIV) allowed by some quantum gravity (QG) theories. First, we use three different and complementary techniques to constrain the total degree of dispersion observed in the data. Additionally, using a maximally conservative set of assumptions on possible source-intrinsic, spectral-evolution effects, we constrain any vacuum dispersion solely attributed to LIV. We then derive limits on the QG energy scale (the energy scale where LIV-inducing QG effects become strong, EQG) and the coefficients of the Standard Model Extension. For the subluminal case (where high-energy photons propagate more slowly than lower-energy photons) and without taking into account any source-intrinsic dispersion, our most stringent limits (at 95% C.L.) are obtained from GRB 090510 and are EQG,1 > 7.6 times the Planck energy (EPl) and EQG,2 > 1.3 × 1011 GeV for linear and quadratic leading-order LIV-induced vacuum dispersion, respectively. In conclusion, these limits improve the latest constraints by Fermi and H.E.S.S. by a factor of ~2more » . Our results disfavor any class of models requiring EQG,1 ≲ EPl .« less
 [1] ;  [2] ;  [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5]
  1. Laboratoire Univers et Particules de Montpellier, Universite Montpellier 2, CNRS/IN2P3, CC 72, Place Eugene Bataillon (France)
  2. Laboratoire de Physique Nucleaire et de Hautes Energies, Universite Pierre et Marie Curie Paris 6, Universite Denis Diderot Paris 7, CNRS/IN2P3 (France)
  3. The Open University of Israel (Israel). Department of Natural Sciences
  4. Astrophysics Science Division, NASA/Goddard Space Flight Center, Greenbelt, MD (United States); University of California, Los Angeles, CA (United States). Department of Physics and Astronomy
  5. Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (Italy); Universita di Trieste (Italy). Dipartimento di Fisica
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 87; Journal Issue: 12; Journal ID: ISSN 1550-7998
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
Contributing Orgs:
Fermi-LAT Collaboration
Country of Publication:
United States
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1102800