Re:Rumours swell over new kind of gravitational-wave sighting
by cygx on Sunday August 27, 2017 @05:17AM
(#15109895)
And recession velocities have units of distance per time and exceed c at the Hubble sphere.
Such coordinate velocities are largely meaningless, though: The more interesting quantity is the relative velocity as evaluated via parallel transport along the trajectory of the photon you use to observe the receeding object, which goes to c at the cosmic event horizon.
Such coordinate velocities are largely meaningless, though: The more interesting quantity is the relative velocity as evaluated via parallel transport along the trajectory of the photon you use to observe the receeding object, which goes to c at the cosmic event horizon.