3 votes
Accepted

Black hole metric of reflected shell of incoming light

The incoming light has a large mass, and therefore exerts a large impulse on the mirror when it's reflected. The impulse integrated over the whole mirror is zero, but force can't be transmitted ...
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2 votes

Can we use entangled particles to find out what is going on inside a black hole?

This is a version on steroids of the famous Einstein–Podolsky–Rosen Paradox. In General Relativity, to get out of a black hole requires you to move faster than light, so your question can essentially ...
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2 votes

What does the no-hair theorem state about the entropy of black holes?

The no hair theorem is a statement about steady-state vacuum solutions in classical general relativity. It says that once a black hole has settled down to a steady state (by radiating away any dynamic ...
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2 votes
Accepted

Are metrics of general relativity tested?

For Kerr black holes, that is one of the tests performed by the Event Horizon Telescope (do notice the remark by Tim Rias on the comments: the EHT still doesn't have enough resolution to provide a ...
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2 votes

Is extracting energy via the Penrose Process only possible with Kerr black holes?

Theoretical Astrophysicist Dr. Reva Kay Williams was the first person to successfully work out the Penrose mechanism to extract energy from a rotating black hole in 1991 for her Ph.D. dissertation. ...
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1 vote

Are metrics of general relativity tested?

The 'observation' of black holes is somewhat less direct than some other astrophysical bodies. What happens is that there is an accumulation of information, such as X ray emission, orbit parameters of ...
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1 vote

What does the no-hair theorem state about the entropy of black holes?

The no hair theorem says that a black hole is uniquely identified by few parameters (mass, charge, angular momentum). By itself, there are no implications on the entropy, as different microstates may ...
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