MG12 - Talk detail
 

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Abstract

Gravitational origin of the Pioneer Anomaly in metric theories of gravitation: can it be done without destruction of coherence between the theory and experiment in gravitational physics?

From Doppler tracking data and data on circular motion of astronomical objects a metric of the Pioneer Anomaly is obtained. The metric gives a solution to problem of the manifest absence of anomaly acceleration in the orbits of the outer planets and extra-Pluto objects of the Solar system. However, it turns out that light deflection in the metric substantially differs from experimentally established, and the corresponding energy-momentum tensor of matter, which generates such a gravitational field in GR, violates energy dominance conditions. These strongly suggest a non-gravitational origin of the Pioneer Anomaly.

Kinetics and electrodynamics of collisionless plasma in GRBs

We consider initially cold collisionless electron-proton plasma which moves with ultrarelativistic speed and perform numerical integration of 3-dimensional coupled Maxwell-Vlasov equations. We observe plasma reaching equipartition between particles and electromagnetic field and electrons accelerated to larger Lorentz factors with thermal-like energy distribution. Implications of the observed plasma dynamics for GRBs will be discussed.

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