Is there any evidence for extra-dimensions or quantum gravity effects from the delayed MeV–GeV photons in GRB 940217?

Cheng, K. S.; Harkó, Tiberiu

doi:10.1016/j.astropartphys.2004.07.004

Cited by 4 publications

(1 citation statement)

References 49 publications

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“…The modification of the group velocity of the photons by the quantum effects would affect the simultaneity of the arrival times of photons with different energies. Thus, given a distant, transient source of photons, one could measure the differences in the arrival times of sharp transitions in the signals in different energy bands and use this information to constrain quantum gravity and/or multidimensional effects [26].…”

Section: Introductionmentioning

confidence: 99%

Radiation transport equations in non-Riemannian space-times

Cheng

Harkó

2005

Phys. Rev. D

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The transport equations for polarized radiation transfer in non-Riemannian, Weyl-Cartan type space-times are derived, with the effects of both torsion and non-metricity included. To obtain the basic propagation equations we use the tangent bundle approach. The equations describing the time evolution of the Stokes parameters, of the photon distribution function and of the total polarization degree can be formulated as a system of coupled first order partial differential equations. As an application of our results we consider the propagation of the cosmological gamma ray bursts in spatially homogeneous and isotropic spaces with torsion and non-metricity. For this case the exact general solution of the equation for the polarization degree is obtained, with the effects of the torsion and non-metricity included. The presence of a non-Riemannian geometrical background in which the electromagnetic fields couple to torsion and/or non-metricity affect the polarization of photon beams. Consequently, we suggest that the observed polarization of prompt cosmological gamma ray bursts and of their optical afterglows may have a propagation effect component, due to a torsion/non-metricity induced birefringence of the vacuum. A cosmological redshift and frequency dependence of the polarization degree of gamma ray bursts also follows from the model, thus providing a clear observational signature of the torsional/non-metric effects. On the other hand, observations of the polarization of the gamma ray bursts can impose strong constraints on the torsion and non-metricity and discriminate between different theoretical models.Comment: 12 pages, 3 figures, accepted for publication in PR

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Section: Introductionmentioning

confidence: 99%

Radiation transport equations in non-Riemannian space-times

Cheng

Harkó

2005

Phys. Rev. D

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Solar system tests of brane world models

Böhmer

Harkó

Lobo

2008

Class. Quantum Grav.

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The classical tests of general relativity (perihelion precession, deflection of light, and the radar echo delay) are considered for the Dadhich, Maartens, Papadopoulos and Rezania (DMPR) solution of the spherically symmetric static vacuum field equations in brane world models. For this solution the metric in the vacuum exterior to a brane world star is similar to the Reissner-Nordstrom form of classical general relativity, with the role of the charge played by the tidal effects arising from projections of the fifth dimension. The existing observational solar system data on the perihelion shift of Mercury, on the light bending around the Sun (obtained using long-baseline radio interferometry), and ranging to Mars using the Viking lander, constrain the numerical values of the bulk tidal parameter and of the brane tension.

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Classical tests of general relativity in brane world models

Böhmer¹,

Risi²,

Harkó³

2010

Class. Quantum Grav.

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The classical tests of general relativity (perihelion precession, deflection of light, and the radar echo delay) are considered for several spherically symmetric static vacuum solutions in brane world models. Generally, the spherically symmetric vacuum solutions of the brane gravitational field equations, have properties quite distinct as compared to the standard black hole solutions of general relativity. As a first step a general formalism that facilitates the analysis of general relativistic Solar System tests for any given spherically symmetric metric is developed. It is shown that the existing observational Solar System data on the perihelion shift of Mercury, on the light bending around the Sun (obtained using long-baseline radio interferometry), and ranging to Mars using the Viking lander, constrain the numerical values of the parameters of the specific models.

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Is there any evidence for extra-dimensions or quantum gravity effects from the delayed MeV–GeV photons in GRB 940217?

Cited by 4 publications

References 49 publications

Radiation transport equations in non-Riemannian space-times

Radiation transport equations in non-Riemannian space-times

Solar system tests of brane world models

Classical tests of general relativity in brane world models

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