Talk detail

Participant	Galtsov, Dmitry
Institution	Physics Faculty of the Moscow State University - Vorobievy gory 1 - Moscow - - Russia

Session	SF1-2	Accepted		Order	Time
Talk	Oral abstract	Title	Synchrotron radiation and pair creation of massless charges in magnetic field
Coauthors
Abstract	Massless charged particles were never observed, one possible explanation coming from the conjecture that they do not radiate. Indeed, in classical electrodynamics their Lienard-Wiehert potentials diverge on a line of sought parallel to the velocity, and regulairzing this divergence, radiation is subtracted. In massless perturbative QED in vacuum the charge is screened by vacuum polarization and turns out to be vanishing in the classical limit, which agrees with the above classical argument. Meanwhile, in the non-pefturbative QED in the external magnetic field the situation is different since charges are never free, and the Landau spacing in some instances plays the role of an effective mass. We show that synchrotron radiation form massless charges within this framework is finite and purely quantum. Also finite is the probability of one-photon pair creaction. Thus, massless charges, if exist, can still be detected by their electromagnetic effects in strong magnetic fields.
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Session	AT4	Accepted		Order	Time
Talk	Oral abstract	Title	Horizon Regularity and Dilaton Coupling Quantization in EMD Dyons
Coauthors
Abstract	Four-dimensional Einstein-Maxwell-Dilaton theory admits asymptotically flat extremal dyonic solutions for an infinite discrete sequence of the coupling constant values. The quantization condition arises as consequence of regularity of the dilaton function at the event horizon. These dyons satisfy the no-force condition and have flat reduced three spaces like true BPS configurations, but no supersymmetric embeddings are known except for some cases of lower values of the coupling sequence. We discuss their generalizations in higher dimensions and in presence of potentials.
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