text: 231,152,1511156712388005888,15327263,Carl-Johan Haster,"New paper on the ArXiv led by @MITKavli grad student @sylvia_bisco. We look at the population of observed binary black holes (BBHs) to see if there are any correlations between the spin-mass-redshift properties of the population, and we found something! <LINK> There is a robust correlation between the effective binary spin (chiEff) and redshift, in that the width of the chiEff distribution increases with increasing redshift. Apart from Sylvia and myself, this project includes Tom Callister (from @FlatironCCA), Ken Ng (also a grad student at @MITKavli) as well as @sasomao and @farrwill. And it continues on the exciting @FlatironCCA-@MITKavli ""correlation-collaboration"" that was started last year with <LINK> where we found a correlation between chiEff and the mass ratio, again for the population of observed BBHs.",https://arxiv.org/abs/2204.01578,"The population-level distributions of the masses, spins, and redshifts of binary black holes (BBHs) observed using gravitational waves can shed light on how these systems form and evolve. Because of the complex astrophysical processes shaping the inferred BBH population, models allowing for correlations among these parameters will be necessary to fully characterize these sources. We hierarchically analyze the BBH population detected by LIGO and Virgo with a model allowing for correlations between the effective aligned spin and the primary mass and redshift. We find that the width of the effective spin distribution grows with redshift at 98.6% credibility. We determine this trend to be robust under the application of several alternative models and additionally verify that such a correlation is unlikely to be spuriously introduced using a simulated population. We discuss the possibility that this correlation could be due to a change in the natal black hole spin distribution with redshift. ",The binary black hole spin distribution likely broadens with redshift,4,"['New paper on the ArXiv led by @MITKavli grad student @sylvia_bisco.\nWe look at the population of observed binary black holes (BBHs) to see if there are any correlations between the spin-mass-redshift properties of the population, and we found something!\n<LINK>', 'There is a robust correlation between the effective binary spin (chiEff) and redshift, in that the width of the chiEff distribution increases with increasing redshift.', 'Apart from Sylvia and myself, this project includes Tom Callister (from @FlatironCCA), Ken Ng (also a grad student at @MITKavli) as well as @sasomao and @farrwill.', 'And it continues on the exciting @FlatironCCA-@MITKavli ""correlation-collaboration"" that was started last year with https://t.co/9axMQU2o5U where we found a correlation between chiEff and the mass ratio, again for the population of observed BBHs.']",22,04,822