Comparisons With Black Holes
- Radiation effects
- A dark star may emit indirect radiation as described above. Black holes as described by current theories about quantum mechanics emit radiation through a different process, Hawking radiation, first postulated in 1975. The radiation emitted by a dark star depends on its composition and structure; Hawking radiation, by the no-hair theorem is generally thought of as depending only on the black hole's mass, charge, and angular momentum, although the black hole information paradox makes this controversial.
- Light-bending effects
- Although "historical" Newtonian arguments may lead to the gravitational deflection of light (Newton, Cavendish, Soldner), general relativity predicts twice as much deflection in a lightbeam skimming the Sun. This difference can be explained by the additional contribution of the curvature of space under modern theory: while Newtonian gravitation is analogous to the space-time components of general relativity's Riemann curvature tensor, the curvature tensor also contains purely spatial components, and both forms of curvature contribute to the total deflection.
Read more about this topic: Dark Star (Newtonian Mechanics)
Famous quotes containing the words comparisons with, comparisons, black and/or holes:
“I don’t like comparisons with football. Baseball is an entirely different game. You can watch a tight, well-played football game, but it isn’t exciting if half the stadium is empty. The violence on the field must bounce off a lot of people. But you can go to a ball park on a quiet Tuesday afternoon with only a few thousand people in the place and thoroughly enjoy a one-sided game. Baseball has an aesthetic, intellectual appeal found in no other team sport.”
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“Decade after decade, artists came to paint the light of Provincetown, and comparisons were made to the lagoons of Venice and the marshes of Holland, but then the summer ended and most of the painters left, and the long dingy undergarment of the gray New England winter, gray as the spirit of my mood, came down to visit.”
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“The fact that white people readily and proudly call themselves “white,” glorify all that is white, and whitewash all that is glorified, becomes unnatural and bigoted in its intent only when these same whites deny persons of African heritage who are Black the natural and inalienable right to readily—proudly—call themselves “black,” glorify all that is black, and blackwash all that is glorified.”
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