Just because we haven't built an experiment that's successfully directly detected it in the lab is not evidence that dark matter doesn't exist! ϵ You may opt-out by. In coordinate systems convenient for working in regions far away from the black hole, a part of the metric becomes infinite at the event horizon. μ Equations for these physical theories predict that the ball of mass of some quantity becomes infinite or increases without limit. Gravitational singularities are mainly considered in the context of general relativity, where density apparently becomes infinite at the center of a black hole, and within astrophysics and cosmology as the earliest state of the universe during the Big Bang. While in a non-rotating black hole the singularity occurs at a single point in the model coordinates, called a "point singularity", in a rotating black hole, also known as a Kerr black hole, the singularity occurs on a ring (a circular line), known as a "ring singularity". q Solutions to the equations of general relativity or another theory of gravity (such as supergravity) often result in encountering points where the metric blows up to infinity. A gravitational singularity, spacetime singularity or simply singularity is a location in spacetime where the mass and gravitational field of a celestial body is predicted to become infinite by general relativity in a way that does not depend on the coordinate system. But that cannot be quite right. In this view, space is a jigsaw puzzle. M "E" to escape Earth's gravity. That would not merely distort space but dismantle it. The regularity becomes evident when changing to another coordinate system (such as the Kruskal coordinates), where the metric is perfectly smooth. To an outside observer, it would look like time was slowing down for you, eventually coming to a stop. / The physics of our greatest theories breaks down. G In fact, I've calculated it myself, here; go check it out! c (or in Planck units, 4:10 PM: Could replacing particles or other fundamental points with a new point-of-view, could we get new answers? The number of “molecules” that it is made up of must be proportional not to its volume but to its surface area. J The idea can be stated in the form that due to quantum gravity effects, there is a minimum distance beyond which the force of gravity no longer continues to increase as the distance between the masses becomes shorter, or alternatively that interpenetrating particle waves mask gravitational effects that would be felt at a distance. There's nothing he presented that you can use, say, a fact to challenge his idea. Some theories, such as the theory of loop quantum gravity, suggest that singularities may not exist. However, many of these points are completely regular, and the infinities are merely a result of using an inappropriate coordinate system at this point. We can hope, but I hope he's honest that his theory is not quite there yet. The edge of a black hole is called the event horizon, and it represents a barrier that even light can’t come out of. ρ By Andrew Zimmerman Jones, Daniel Robbins. {\displaystyle \mu ^{2}M} The metric can be finite everywhere coordinate system is used. a By Andrew Zimmerman Jones, Daniel Robbins . (or in Planck units, What exactly those building blocks are depends on the theory. μ Even in a vacuum, with no particles around, the electromagnetic and other fields are internally entangled. This means the metric is regular for all positive values of The quantities used to measure gravitational field strength are the scalar invariant curvatures of spacetime, which includes a measure of the density of matter. − 4:59 PM: This is Verlinde's big "conclusion"? But absence of evidence is not evidence of absence. ( the motions of individual galaxies within galaxy clusters. 2 = a To argue otherwise is pure silliness. , the case where But if you increase the radius of a black hole by a factor of 10, the inferred number of molecules goes up by only a factor of 100. Singularities also exist inside of black holes. ± / Also, actual astrophysical black holes are not expected to possess any appreciable charge. Combining these two ideas helped cosmology to understand how the universe works on the big level and small level. , where One of the consequences of Einstein’s general theory of relativity was a solution in which space-time curved so much that even a beam of light became trapped. This would look identical to the black hole emitting radiation. 2 If gravitation isn't fundamental, but is rather an emergent force that comes about from the... [+] properties of fundamental qbits of information, perhaps this new way of looking at the Universe will answer some of our greatest fundamental puzzles.

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