Probably way too expensive, but interesting to see how simple rules with feedback resembles nature in so many ways.
More SE related was this video from the same guy:
[youtube]lctXaT9pxA0[/youtube]
Probably way too expensive, but interesting to see how simple rules with feedback resembles nature in so many ways.
you might be even more right than you think if black hole cosmology proves to be trueIt's fascinating how the entire intuitive concept of time and contemporaneity falls apart. Once crossing the horizon, we can still see the spaceship and the universe, but we've detached from that universe which in one sense is expired and gone.
There's little sense of one black hole falling into or being absorbed by the other. Instead a new, larger event horizon forms that encompasses both and quickly settles down into its final shape.One thing I wanted to ask-- I was reading about the far future "collision" between M31 and our galaxy resulting in a giant elliptical galaxy (like M87) in the far future- are the supermassive black holes of both galaxies going to collide or is one just expected to absorb the other (likely the M31 supermassive black hole will absorb ours because it's more massive.)
Wow this is absolutely fascinating. I spent about 6 hours today reading 150 research articles on ER=EPR and its amazing and deep relationship to the holographic principle via quantum entanglement, quantum entanglement via microwormholes leading to emergent spacetime, fractal properties of spacetime, the 8 colors combinations of gluon interactions with quarks and antiquarks, a recent close to 5 sigma possible discovery of sterile neutrinos, different types of black holes, black holes in 5 dimensional space leading to naked singularities, traversable wormholes in 6 dimensional Randall Sundstrum II space, about two dozen of Sean Carroll's blog entries on MWT and its relation to quantum superposition and the conservation of energy across the multiverse and even a discovery of what appears to be negative mass. Seems like new developments are coming quickly!There's little sense of one black hole falling into or being absorbed by the other. Instead a new, larger event horizon forms that encompasses both and quickly settles down into its final shape.One thing I wanted to ask-- I was reading about the far future "collision" between M31 and our galaxy resulting in a giant elliptical galaxy (like M87) in the far future- are the supermassive black holes of both galaxies going to collide or is one just expected to absorb the other (likely the M31 supermassive black hole will absorb ours because it's more massive.)
It won't be a direct collision of the black holes, either. Supermassive black holes are still extremely small relative to the sizes of the galaxies, so even a tiny amount of sideways motion of the two will mean they miss each other at first. When the galaxies merge the black holes will likely end up in a widely separated and very elliptical orbit about each other, then eventually migrate inward and spiral together by scattering stars and radiating gravitational waves.
Here's a plot of the distances between the two black holes throughout a simulation of the galaxy merger. The top shows this for three different initial sideways velocities of Milky Way and Andromeda (for which we do not know the true value), while the bottom shows how much the result depends on the resolution of the simulation (it indeed looks quite robust). The figure is from a study earlier this year: https://arxiv.org/pdf/2102.10938.pdf
Once the black holes get to a few hundred light years of each other, the N-body galaxy merger simulation is no longer useful for calculating the evolution of the black hole binary, and a different type of simulation including gravitational wave emission is necessary. The next figure shows a plot of that phase of the evolution. Notice the extremely high eccentricity at first (it is close to 1). This phase of the merger is comparatively quick -- about ten million years or so.
Wow that is one steep curve!There's little sense of one black hole falling into or being absorbed by the other. Instead a new, larger event horizon forms that encompasses both and quickly settles down into its final shape.One thing I wanted to ask-- I was reading about the far future "collision" between M31 and our galaxy resulting in a giant elliptical galaxy (like M87) in the far future- are the supermassive black holes of both galaxies going to collide or is one just expected to absorb the other (likely the M31 supermassive black hole will absorb ours because it's more massive.)
It won't be a direct collision of the black holes, either. Supermassive black holes are still extremely small relative to the sizes of the galaxies, so even a tiny amount of sideways motion of the two will mean they miss each other at first. When the galaxies merge the black holes will likely end up in a widely separated and very elliptical orbit about each other, then eventually migrate inward and spiral together by scattering stars and radiating gravitational waves.
Here's a plot of the distances between the two black holes throughout a simulation of the galaxy merger. The top shows this for three different initial sideways velocities of Milky Way and Andromeda (for which we do not know the true value), while the bottom shows how much the result depends on the resolution of the simulation (it indeed looks quite robust). The figure is from a study earlier this year: https://arxiv.org/pdf/2102.10938.pdf
Once the black holes get to a few hundred light years of each other, the N-body galaxy merger simulation is no longer useful for calculating the evolution of the black hole binary, and a different type of simulation including gravitational wave emission is necessary. The next figure shows a plot of that phase of the evolution. Notice the extremely high eccentricity at first (it is close to 1). This phase of the merger is comparatively quick -- about ten million years or so.