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Cosmological redshift actually can be explained kinematically and the special relativistic Doppler's formula $$ 1 + z = \gamma \left( 1 - \frac{ \mathbf v \cdot \mathbf w }{\|\mathbf w\|} \right) $$ remains valid in a curved background as long as you realize that you need to determine the 4-velocity $V^\mu = (\gamma, \gamma \mathbf v)$ via parallel transport ...


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The expansion of the Universe, described by Hubble's constant, is measured in "velocity per distance"-- km/s per Mpc. So to say it's faster than light is not quite correct. Though the idea that somewhere, faraway, space is moving away from us at faster than light is correct, and it introduces the notion of a cosmological horizon. Rather than recite it, I'll ...


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The part of the universe which is expanding faster than the speed of light can't be observed.There is a notion of observable universe. There is no law which states that objects cant move faster than the speed of light. It states that information can't travel faster than speed of light. When universe is expanding faster than speed of light it doesn't violate ...



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