Hollow ghost sphere5/17/2023 Within the story, this planet has been taken over by a malignant 'force' and has been hollowed out, so that there is one mile of basalt crust forming a spherical shell, and the inside is a void filled with nitrogen. The planet in question is Earth-sized and it orbits a Sun-like star. I would like some input into the consequences of this physics according to standard physics. If the latter is the case, this would be a way of converting mass into energy in the form of gravitational waves 100% efficiently.I am writing a science-fiction story, which contains a 'crazy' planet. Even so, I don't know how black holes would form in that region, or if they dissapear due to hawking radiation. It may only work for very small values of $R-r$. $$ \tau \approx 6.57 \frac$ before the shell reaches a density high enough to collapse into the black hole at a smaller radius. Calculating the lapsed time to fall from the horizon to the singularity of an existing black hole is a standard exercise in GR, and the result is: In principle we can take the shell and compress it until it's external radius falls below the Schwarzschild radius $r = 2GM/c^2$, at which point the shell will start collapsing inwards and form a singularity in a finite time. the metric inside the shell is the Minkowski metric. This is true in Newtonian gravity, and is also true in General Relativity as a consequence of Birkhoff's theorem i.e. If you construct a spherical shell then an observer inside it feels no gravity. If you want to add in your own opinions/contribute to a discussion about it, that'd be a bonus.Īfter I commented on the question I started wondering what an observer inside a collapsing shell would experience. To be clear, I am asking: In my scenario, would there be any effects of gravity on things in the hollow? And would information lost in the black hole be accessible to the hollow (which is essentially its own isolated bubble of the universe)? A good answer can address these two questions. I know this question seems a bit more like a discussion than a Q
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