On 29-06-2019 22:44, John Clark wrote:
On Sat, Jun 29, 2019 at 1:59 PM Lawrence Crowell <[email protected]> wrote:_> It sort of makes sense this might involve magnetars. If a neutron star with a huge magnetic field, ~ 10^{10}T, collides with another neutron star or black hole the sudden reconfiguration of the magnetic field might send a huge electromagnetic pulse._Maybe, but to me that seems like a explanation of Gamma Bay Bursts, FRB's are something different, a single immensely powerful millisecond radio pulse with no accompanying gamma, X-ray or optical emissions. Of the 60 known FRB's most never repeat but 2 of them have which would rule out any sort of catastrophic collision, at lest for those two, but we may be dealing with two different phenomenon with two different underlying mechanisms. One idea involves a very rapidly rotating neutron star of more than 2.2 solar mass but less than 2.7, normally such a thing would collapse into a Black Hole but not if its spinning fast enough; however its its powerful magnetic field would gradually slow it down and when it reached a critical point it would collapse and form a Black Hole and maybe produce a radio pulse. But of course something like that couldn't repeat and at least 2 FRB's do. Another idea for the cause involved the decay of Axion Miniclusters, but of course they couldn't repeat either: Fast Radio Bursts and Axion Miniclusters [1] Yet another weird idea involve superconducting cosmic strings, maybe that could repeat. Superconducting cosmic strings as sources of cosmological fast radio bursts [2]
Or perhaps a process that leads to emission along a narrow beam. The power of the source can then be much less and you can then occasionally get repeat events from the same source.
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