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HNQ
3:09 AM
1
Q: Trick for integration into a plane wave basis

João Paulo MeloI'm reading the article https://arxiv.org/abs/hep-th/9705200 and part of it has left me very confused. In order to speak about their equation (1) the authors make the following statement: \begin{align*} K(t) &= \lim_{x' \to x} \int \dfrac{d^4 k}{(2\pi)^4} e^{i k \cdot (x - x')} \left( e^{-i k \cd...

 
 
5 hours later…
HNQ
8:00 AM
5
Q: How do black holes move if they are just regions in spacetime?

Rick GenningsIf black holes are just regions of spacetime, where the slope of spacetime is infinite at it's center, how can black holes even move? When matter moves through spacetime, it bends the spacetime around it, but if black holes are just regions of spacetime, how can a region in spacetime bend other r...

 

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