# Black hole jets and gravitational entropy

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In this reference eq. (85) represents the axisymmetric entropy density for a Kerr-Newman black hole. The entropy is singular at the poles but it is well behaved elsewhere

Question: Is there any relationship between the fact that the entropy density diverges at the poles, and the formation of relativistic jets in the polar directions?

asked Jun 17, 2014

Jets in general are not yet well understood in astrophysics, but they happen too associated with objects others than Black Holes, like T Tauri stars and some kinds of binaries. They appear associated to accretion disks and magnetic field lines that "twist" producing the collimated shape of the jet.

A quick, random search in Arxiv can give you a general impression. Presently there are numerous studies and MHD simulations in order to understand jets, e.g. arxiv.org/abs/1108.4924

thanks Eduardo. I'm aware of (some) the mainstream MHD explanations, but I was wondering if it could also be interpreted as a thermal effect of the Kerr axial entropy density

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