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Limits on an Energy Dependence of the Speed of Light from a Flare of the Active Galaxy PKS 2155-304

F. Aharonian A.G. Akhperjanian U. Barres de Almeida A.R. Bazer-Bachi 1 B. Behera M. Beilicke W. Benbow K. Bernlöhr C. Boisson 2 V. Borrel 1 I. Braun E. Brion 3 J. Brucker R. Bühler T. Bulik I. Büsching T. Boutelier 4 S. Carrigan P.M. Chadwick R. Chaves L.-M. Chounet 5 G. Coignet 6 R. Cornils L. Costamante M. Dalton B. Degrange 5 H.J. Dickinson A. Djannati-Ataï 7 W. Domainko L.O'C. Drury F. Dubois 6 G. Dubus 4 J. Dyks K. Egberts D. Emmanoulopoulos P. Espigat 8 C. Farnier 9 F. Feinstein 9 A. Fiasson 3, 9 A. Förster G. Fontaine 5 M. Füßling S. Gabici Y.A. Gallant 9 L. Gérard 8 B. Giebels 5 J.F. Glicenstein 3 B. Glück P. Goret 3 C. Hadjichristidis D. Hauser M. Hauser G. Heinzelmann G. Henri 4 G. Hermann J.A. Hinton A. Hoffmann W. Hofmann M. Holleran S. Hoppe D. Horns A. Jacholkowska 9 O.C. de Jager I. Jung K. Katarzy'Nski E. Kendziorra M. Kerschhaggl D. Khangulyan B. Khélifi 5 D. Keogh Nu. Komin 9 K. Kosack G. Lamanna 6 I.J. Latham J.-P. Lenain 2 T. Lohse J.M. Martin 2 O. Martineau-Huynh 10 A. Marcowith 9 C. Masterson D. Maurin 10 T.J.L. Mccomb R. Moderski Emmanuel Moulin 3 M. Naumann-Godo 5 M. de Naurois 10 D. Nedbal D. Nekrassov S.J. Nolan S. Ohm J.-P. Olive 1 E. de Oña Wilhelmi 8 K.J. Orford J.L. Osborne M. Ostrowski M. Panter G. Pedaletti G. Pelletier 4 P.-O. Petrucci 4 S. Pita 8 G. Pühlhofer M. Punch 8 A. Quirrenbach B.C. Raubenheimer M. Raue S.M. Rayner M. Renaud F. Rieger J. Ripken L. Rob S. Rosier-Lees 6 G. Rowell B. Rudak J. Ruppel V. Sahakian A. Santangelo R. Schlickeiser F.M. Scöck R. Schröder U. Schwanke S. Schwarzburg S. Schwemmer A. Shalchi H. Sol 2 D. Spangler L. Stawarz R. Steenkamp C. Stegmann G. Superina 5 P.H. Tam J.-P. Tavernet 10 R. Terrier 8 V. Marandon 8 C. van Eldik G. Vasileiadis 9 C. Venter J.P. Vialle 6 P. Vincent 10 M. Vivier 3 H.J. Völk F. Volpe 5 S.J. Wagner M. Ward A.A. Zdziarski A. Zech 2
Abstract : In the past few decades, several models have predicted an energy-dependence of the speed of light in the context of quantum gravity. For cosmological sources such as active galaxies, this minuscule effect can add up to measurable photon-energy dependent time lags. In this paper a search for such time lags during the H.E.S.S. observations of the exceptional very high energy flare of the active galaxy PKS 2155-304 on 28 July in 2006 is presented. Since no significant time lag is found, lower limits on the energy scale of speed of light modifications are derived.
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F. Aharonian, A.G. Akhperjanian, U. Barres de Almeida, A.R. Bazer-Bachi, B. Behera, et al.. Limits on an Energy Dependence of the Speed of Light from a Flare of the Active Galaxy PKS 2155-304. Physical Review Letters, American Physical Society, 2008, 101, pp.170402. ⟨10.1103/PhysRevLett.101.170402⟩. ⟨in2p3-00332607⟩

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