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3 votes
1 answer
195 views

Two naive questions about gravitational waves

My understanding of GW is that they ripple the fabric of the space-time just as accelerating charged particle emits electromagnetic radiation, accelerating massive objects produce gravitational ...
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  • 1,151
9 votes
2 answers
218 views

Two charged black holes in equilibrium

Consider a pair of (possibly rotating) charged black holes with masses $m_1$ and $m_2$, and like charges $q_1$ and $q_2$. It seems that under certain conditions gravitational attraction should exactly ...
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16 votes
3 answers
41k views

How do we determine the mass of a black hole?

Since by definition we cannot observe black holes directly, how do astronomers determine the mass of a black hole? What observational techniques are there that would allow us to determine a black ...
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14 votes
7 answers
2k views

Binary Black Hole Solution of General Relativity?

This is rather a technical question for experts in General Relativity. An accessible link would be an accepable answer, although any additional discussion is welcome. GR has well known solutions ...
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