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Hubble's law and faster than light expansion speeds
Hubble's law faster than light expansion speeds
2011/10/14
Naively applying Hubble's law to a sufficiently distant object gives a receding velocity larger than the speed of light. By discussing a very similar situation in special relativity, we argue that Hub...
Rotating BHs as Central Engines of Long GRBs: Faster is Better
Rotating BHs Central Engines
2011/1/10
We performed simulations of collapsars with different Kerr parameters a=0, 0.5, 0.9, 0.95. It is shown that a more rapidly rotating black hole is driving a more energetic jet. No jet is seen for the c...