This neutron star must have a quadrupole distribution of matter or higher order. A neutron star is composed largely of neutron fluid. If this is rotating there may be set up by thermal gradients and Coriolis acceleration convection flows that would set up such a distribution of matter. It is one possible reason the millisecond pulsar is the upper limit on their spin.
LC On Monday, November 9, 2020 at 8:10:29 AM UTC-6 [email protected] wrote: > A pulsar is a Neutron Star that is rotating hundreds of times a second and > is sending out radio pulses when it does so. If the Neutron Star was > perfectly spherical it would not generate any Gravitational Waves no matter > how fast it was rotating and neither would it if it was flattened at the > poles into a perfect oblate spheroid as long as it was still symmetrical, > but if there was any irregularity it would generate Gravitational Waves. > The waves would be far weaker than those generated by Black Hole collisions > but nevertheless LIGO would still be able to detect them because unlike the > Black Hole case the generation of these ways would be continuous and even > more important because they know the frequency of the Gravitational waves > if they existed because they already know the radio frequency of the > pulsar. So they know what frequency to look for. A recent paper looked for > these waves that must have been generated by several different pulsars if > they were irregular and they didn't find any, they were able to conclude > that any variation from being perfectly symmetrical for a Neutron Star 20 > km across must be smaller than the width of a human hair. > By the way I've never seen a paper with that many authors. > > Gravitational-wave constraints on the equatorial ellipticity of > millisecond pulsars <https://arxiv.org/abs/2007.14251> > > > John K Clark > > > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/847434cb-5e73-400d-8484-19d183531a9bn%40googlegroups.com.
