Ultrahigh-energy cosmic-ray bounds on nonbirefringent modified Maxwell theory

Klinkhamer, F. R.; Risse, M.

doi:10.1103/physrevd.77.016002

Cited by 102 publications

(94 citation statements)

References 55 publications

(130 reference statements)

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“…Recently, an entirely different type of indirect bound [14,15] has been obtained from an ultrahigh-energy-cosmic-ray (UHECR) event, which, at the two-σ level, is given by…”

Section: Isotropic Modified-maxwell Theory and Current Boundsmentioning

confidence: 99%

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New two-sided bound on the isotropic Lorentz-violating parameter of modified Maxwell theory

2008

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There is a unique Lorentz-violating modification of the Maxwell theory of photons, which maintains gauge invariance, CPT, and renormalizability. Restricting the modified-Maxwell theory to the isotropic sector and adding a standard spin-1 2 Dirac particle p ± with minimal coupling to the nonstandard photon γ, the resulting modified-quantum-electrodynamics model involves a single dimensionless "deformation parameter," κ tr . The exact tree-level decay rates for two processes have been calculated: vacuum Cherenkov radiation p ± → p ± γ for the case of positive κ tr and photon decay γ → p + p − for the case of negative κ tr . From the inferred absence of these decays for a particular high-quality ultrahigh-energy-cosmic-ray event detected at the Pierre Auger Observatory and a well-established excess of TeV gamma-ray events observed by the High Energy Stereoscopic System telescopes, a two-sided bound on κ tr is obtained, which improves by eight orders of magnitude upon the best direct laboratory bound. The implications of this result are briefly discussed.

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“…Recently, an entirely different type of indirect bound [14,15] has been obtained from an ultrahigh-energy-cosmic-ray (UHECR) event, which, at the two-σ level, is given by…”

Section: Isotropic Modified-maxwell Theory and Current Boundsmentioning

confidence: 99%

“…Demanding E prim < E (a) thresh and using (9) with M set to the value 52 GeV of an iron nucleus (an absolutely conservative choice as discussed in Refs. [14,15]), the following two-σ (98 % CL) bound is obtained:…”

Section: New Indirect Bounds On the Isotropic LV Parametermentioning

confidence: 99%

New two-sided bound on the isotropic Lorentz-violating parameter of modified Maxwell theory

2008

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“…The Lorentz-violating (LV) terms, generated as vacuum expectation values of tensors defined in a high energy scale, are coupled to the physical fields yielding coordinate invariance and violation of Lorentz symmetry in the particle frames [11]. This theoretical framework has inspired a large number of investigations in the last several years, encompassing fermion systems [12][13][14][15][16][17][18][19][20], CPT-probing experiments [21][22][23][24][25][26][27], the electromagnetic CPT-and Lorentzodd term [28]- [41], the CPT-even and Lorentz-odd gauge sector and its interactions with fermions [42][43][44][45][46][47][48][49][50][51], [52][53][54][55][56][57]. Recent investigations involving higher dimensional operators [58][59][60], its possible connections with LV theories [61][62][63][64][65][66], and nonminimal couplings …”

Section: Introductionmentioning

confidence: 99%

Einstein-Hilbert graviton modes modified by the Lorentz-violating bumblebee field

et al. 2014

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In this work, we investigate the consequences of the spontaneous breaking of Lorentz symmetry, triggered by the bumblebee vector field, on the usual Einstein-Hilbert theory. Specifically, we consider the Einstein-Hilbert action modified by the bumblebee dynamic field, and evaluate the graviton propagator using an extended basis of Barnes-Rivers tensor projectors, involving the Lorentz-violating vector. Once the propagator is carried out, we proceed with discussing the consistency of the model, writing the dispersion relations, and analyzing causality and unitarity.We verify that this model possesses two dispersion relations: one provides causal and unitary propagating modes, while the second yields a causal but nonunitary mode which spoils the physical consistency of the model.

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“…The multimessenger astrophysics program studying high-energy phenomena with ultrahigh-energy cosmic rays [32,38,39], cosmic gamma rays [40], and cosmic neutrinos [41] has developed the field of astroparticle physics over the last years and now serves as a powerful tool to test fundamental physics symmetries.…”

Section: Discussionmentioning

confidence: 99%

Parton-model calculation of a nonstandard decay process in isotropic modified Maxwell theory

Díaz

Klinkhamer

2015

Phys. Rev. D

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We have performed a calculation in the parton-model approximation of a nonstandard decay process in isotropic modified Maxwell theory coupled to standard Dirac theory, with a single Lorentz-violating parameter κ in the photonic sector. Previous calculations of this process (vacuum Cherenkov radiation by a proton for the theory with κ > 0) were performed for pointlike particles, and an upper bound on κ at the 10 −19 level was obtained from experimental data on ultra-high-energy cosmic rays. The parton-model results change the decay rate by about an order of magnitude but give the same upper bound on κ because the threshold energy is unchanged. The previous point-particle calculation of photon decay into an electron-positron pair for the theory with κ < 0 remains valid, and experimental results on cosmic gamma rays provide a lower bound on κ at the −10 −15 level.

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Ultrahigh-energy cosmic-ray bounds on nonbirefringent modified Maxwell theory

Cited by 102 publications

References 55 publications

New two-sided bound on the isotropic Lorentz-violating parameter of modified Maxwell theory

New two-sided bound on the isotropic Lorentz-violating parameter of modified Maxwell theory

Einstein-Hilbert graviton modes modified by the Lorentz-violating bumblebee field

Parton-model calculation of a nonstandard decay process in isotropic modified Maxwell theory

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