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Prof. Katz is studying the recently discovered Fast Radio Bursts, extremely bright but brief (millisecond) sources of radio radiation. Their radiation must be emitted from very small sources, and therefore must have a very high "brightness temperature", like the most intense emission of pulsars. By applying the classical "log number-log flux" test he was able to confirm their origin at cosmological distances (and hence their great power and brightness), and with a new test, using their distribution of dispersion measures (electron column density between us and them) excluded expanding shells, such as supernova remnants, as sources of their dispersion, confirming that most of their dispersion measure results from propagation in the intergalactic medium. Despite this, the most plausible origin of Fast Radio Bursts is in the giant flares of Soft Gamma Repeaters, and he suggested a mechanism involving the excitation of plasma instability by Compton scattering of electron-positron pair annihilation radiation or by two-stream instability in a pair gap. Either may be the consequence of the sudden dissipation of magnetic energy in a neutron star magnetosphere, the most popular model of Soft Gamma Repeaters.
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arxiv(2023)
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FUSION SCIENCE AND TECHNOLOGYpp.1-48, (2023)
arXiv (Cornell University) (2023)
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arXiv (Cornell University) (2023)
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