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Nature, 1990
Astronomers are among the most international of scientists. Yet chauvinism surfaces on a cosmic scale where the anxious search for a massive black hole at the centre of our Galaxy is concerned. The prodigious amounts of energy emitted from tiny regions at the centres of some nearby galaxies imply that they contain accreting black holes of ...
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Astronomers are among the most international of scientists. Yet chauvinism surfaces on a cosmic scale where the anxious search for a massive black hole at the centre of our Galaxy is concerned. The prodigious amounts of energy emitted from tiny regions at the centres of some nearby galaxies imply that they contain accreting black holes of ...
openaire +3 more sources
Scientific American, 2009
The article discusses the prevention of the formation of black holes as a result of quantum effects and how these effects may give rise to dense entities called black stars instead. Topics include an overview of the theoretical physics of black holes, such as Einstein's field equations from his general relativity theory, a description and analysis of ...
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The article discusses the prevention of the formation of black holes as a result of quantum effects and how these effects may give rise to dense entities called black stars instead. Topics include an overview of the theoretical physics of black holes, such as Einstein's field equations from his general relativity theory, a description and analysis of ...
BARCELO' C +3 more
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When is a black hole not a black hole?
New Scientist, 2019When it's an astrophysical black hole, of course.
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2009
Abstract A black hole is an object that is inside its event horizon at r=r*: a one-way surface that particles and light can only traverse inward. This chapter studies the spherically symmetric nonrotating Schwarzschild black hole. The metric elements change their respective signs when crossing from r>r∗ to r<r*, leading to ...
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Abstract A black hole is an object that is inside its event horizon at r=r*: a one-way surface that particles and light can only traverse inward. This chapter studies the spherically symmetric nonrotating Schwarzschild black hole. The metric elements change their respective signs when crossing from r>r∗ to r<r*, leading to ...
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Scientific American, 2005