# Questions tagged [reissner-nordstrom-metric]

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### What is $A'$ in the Reissner-Nordstrom metric?

So I was reading this paper on the Reissner-Nordstrom metric and on it they define $A$ as: But they don't define $A'$. Yet $A'$ still ends up in other equations like defining the Ricci tensors: So ...
• 33
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### What unit of measurement are used for 𝑀 and 𝑟 in the Schwarzschild metric?

So I understand that 𝑀 in any metric solution stands for mass. But what unit of measurement do you use to define 𝑀?
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### Does a charged particle respond to a charged black hole both gravitationally and electromagnetically?

The Reissner–Nordström metric is given by: $$ds^2= \Bigl( 1-\frac{r_s}{r}+\frac{r_Q^2}{r^2} \Bigr) c^2dt^2- \Bigl( 1-\frac{r_s}{r}+\frac{r_Q^2}{r^2} \Bigr)^{-1}dr^2-r^2d\Omega^2$$ Which is intuitive ...
• 1,170
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### How is electric charge acting as a negative mass in general relativity?

In a NASA script on negative masses, there was the following statement: How is it understandable that, there, charge "acts negative on mass"? In general relativity, all kinds of energy ...
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### Reissner–Nordström blackhole and irreducible mass

I'm learning the Reissner–Nordström metric and confused by the notion of irreducible mass $M_\text{irr}$. It is said that the "total mass" $M$ contains both the irreducible mass and the ...
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