# astro: the binary black hole spin distribution, a sort of cosmic estension of Mr. Jelly Roll

<< The direct detection of gravitational waves from merging binary black holes opens up a window into the environments in which binary black holes form. One signature of such environments is the angular distribution of the black hole spins >>

AA << report that, if the magnitudes of the black hole spins are allowed to extend to high values, the effective spins for these systems indicate a 0.015 odds ratio against an aligned angular distribution compared to an isotropic one [isotropic spin orientation: the spins of the black holes are randomly oriented with respect to the orbit of the binary system]. When considering the effect of ten additional detections, this odds ratio decreases to 2.9 × 10−7 against alignment >>

Will M. Farr, Simon Stevenson, et al. Distinguishing spin-aligned and isotropic black hole populations with gravitational waves. Nature 548, 426–429 Aug 24, 2017 doi: 10.1038/nature23453

http://www.nature.com/nature/journal/v548/n7668/full/nature23453.html

https://arxiv.org/abs/1706.01385

<< Amico, qualunque  cosa suonerai . . . suonerai Jelly Roll >>

Jelly Roll Morton (opp. Mouton, alias di Ferdinand La Menthe, opp. La Mothe, New Orleans, 20 ott ~1885 - Los Angeles, 10 luglio 1941, ~56a).  Ref: Alan Lomax. "Mister Jelly Roll". Duell, Sloan & Pearce, New York (1950);  cit. in: Arrigo Polillo, "JAZZ". Oscar Saggi Mondadori. (1977):315,325.

http://inkpi.blogspot.it/search?q=jelly+roll