WHEN BLACK HOLES SLOW DOWN --
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From: Sam Wormley on 11 Jun 2010 13:37 PHYSICAL REVIEW FOCUS 11 June 2010 http://focus.aps.org/ David Ehrenstein, American Physical Society Introductions to the Focus stories of the past week; visit http://focus.aps.org for the complete stories. WHEN BLACK HOLES SLOW DOWN When two black holes merge, the resulting larger black hole usually shoots away from its birthplace, but it immediately slows down in some cases, according to computer simulations. In the 4 June Physical Review Letters, a team offers an explanation for this puzzling deceleration. They suggest that the moving black hole can radiate gravitational waves preferentially in the forward direction as a result of asymmetry in the curvature of spacetime around it. That slows the black hole like a spacecraft firing retro-rockets. The paper provides an intuitive explanation for the slow-down with a much-simplified simulation that the team believes can be generalized. Luciano Rezzolla et al., Phys. Rev. Lett. 104, 221101 Link to the paper: http://link.aps.org/doi/10.1103/PhysRevLett.104.221101 COMPLETE Focus story at http://focus.aps.org/story/v25/st22 VIDEO included with this story.
From: Raymond Yohros on 11 Jun 2010 15:47 On Jun 11, 12:37 pm, Sam Wormley <sworml...(a)gmail.com> wrote: > PHYSICAL REVIEW FOCUS 11 June 2010 http://focus.aps.org/ > David Ehrenstein, American Physical Society > > Introductions to the Focus stories of the past week; > visithttp://focus.aps.orgfor the complete stories. > > WHEN BLACK HOLES SLOW DOWN > When two black holes merge, the resulting larger black hole usually > shoots away from its birthplace, but it immediately slows down in > some cases, according to computer simulations. > BH dynamics are relative in so many ways, their sizes, nature of (spins(rate,direction),etc.) where they out of phase with each other? > > Physical Review Letters, a team offers an explanation for this > puzzling deceleration. They suggest that the moving black hole can > radiate gravitational waves preferentially in the forward direction > as a result of asymmetry in the curvature of spacetime around it. > That slows the black hole like a spacecraft firing retro-rockets. > The paper provides an intuitive explanation for the slow-down with > a much-simplified simulation that the team believes can be generalized. > BH collisions have historic effects densities that where compact in semisingularities colliding can spread out spacetime kind of like an unstable dying hurricane or also get deeper into their spinrate,density and position sucking d spacetime around. r.y
From: Yousuf Khan on 12 Jun 2010 03:41
On 6/11/2010 11:37 PM, Sam Wormley wrote: > PHYSICAL REVIEW FOCUS 11 June 2010 http://focus.aps.org/ > David Ehrenstein, American Physical Society > > Introductions to the Focus stories of the past week; > visit http://focus.aps.org for the complete stories. > > WHEN BLACK HOLES SLOW DOWN > When two black holes merge, the resulting larger black hole usually > shoots away from its birthplace, but it immediately slows down in > some cases, according to computer simulations. In the 4 June > Physical Review Letters, a team offers an explanation for this > puzzling deceleration. They suggest that the moving black hole can > radiate gravitational waves preferentially in the forward direction > as a result of asymmetry in the curvature of spacetime around it. > That slows the black hole like a spacecraft firing retro-rockets. > The paper provides an intuitive explanation for the slow-down with > a much-simplified simulation that the team believes can be generalized. So we really shouldn't expect to see supermassive blackholes rocketing out of their own galaxies and floating through intergalactic space? Yousuf Khan |