advanced_notions:black_hole
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advanced_notions:black_hole [2018/03/14 15:31] jakobadmin [Layman] |
advanced_notions:black_hole [2018/12/19 11:02] (current) jakobadmin ↷ Links adapted because of a move operation |
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| ====== Black Hole ====== | ====== Black Hole ====== | ||
| - | <tabbox Why is it interesting?> | ||
| - | |||
| - | <blockquote>Among those of us who think about space and time | ||
| - | professionally, black holes play a central role. [...] Beyond the fascination they hold for astronomers, | ||
| - | black holes are important to science for other reasons. They | ||
| - | are a central object of study for those of us who work on | ||
| - | quantum gravity. __In a sense, black holes are microscopes of | ||
| - | infinite power which make it possible for us to see the physics | ||
| - | that operates on the Planck scale.__ | ||
| - | |||
| - | <cite>Three Roads to Quantum Gravity by Lee Smolin</cite></blockquote> | ||
| - | <tabbox Layman> | + | <tabbox Intuitive> |
| {{ :advanced_notions:bhhorizon.png?nolink&400|}} | {{ :advanced_notions:bhhorizon.png?nolink&400|}} | ||
| - | A black hole is a region of space and time where light cannot escape because gravity is so strong. This is possible because [[theories:classical_theories:special_relativity|light always moves with the same velocity]] in the vacuum and therefore cannot move so fast as would be required to escape the black hole. In addition, no object or thing can move faster than with this speed of light, and therefore nothing can escape a black hole. | + | A black hole is a region of space and time where light cannot escape because gravity is so strong. This is possible because [[models:special_relativity|light always moves with the same velocity]] in the vacuum and therefore cannot move so fast as would be required to escape the black hole. In addition, no object or thing can move faster than with this speed of light, and therefore nothing can escape a black hole. |
| As a result, no light and nothing else can emerge from the black hole. | As a result, no light and nothing else can emerge from the black hole. | ||
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| * A great discussion of Black Holes in layperson terms can be found in Chapter 5 of Three Roads to Quantum Gravity by Lee Smolin | * A great discussion of Black Holes in layperson terms can be found in Chapter 5 of Three Roads to Quantum Gravity by Lee Smolin | ||
| + | * See also the short video series by Minutephysics: | ||
| + | * [[https://www.youtube.com/watch?v=sgIqRwvaBw4|How We Know Black Holes Exist]] | ||
| + | * [[https://www.youtube.com/watch?v=t-O-Qdh7VvQ|The Unreasonable Efficiency of Black Holes]] | ||
| + | * [[https://www.youtube.com/watch?v=brmjWYQi2UM|The Black Hole Tipping Point]] | ||
| + | * See also [[http://mentalfloss.com/article/84683/black-holes-field-guide|Everything You Ever Wanted to Know About Black Holes]] by Dank Falk | ||
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| - | <tabbox Student> | + | <tabbox Concrete> |
| **Black Hole Entropy - Bekenstein's law** | **Black Hole Entropy - Bekenstein's law** | ||
| Line 69: | Line 65: | ||
| **Black Hole Temperature - Hawking Radiation** | **Black Hole Temperature - Hawking Radiation** | ||
| + | |||
| + | //see also [[advanced_notions:hawking_radiation|Hawking Radiation]]// | ||
| In the beginning, many people did not take Bekenstein's ideas about the entropy of a black hole seriously, because of the following reason: | In the beginning, many people did not take Bekenstein's ideas about the entropy of a black hole seriously, because of the following reason: | ||
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| where $k_B$ is the Boltzmann constant, $c$ the speed of light, $G$ the gravitational constant, $\hbar$ the reduced Planck constant and $M$ the mass of the black hole. | where $k_B$ is the Boltzmann constant, $c$ the speed of light, $G$ the gravitational constant, $\hbar$ the reduced Planck constant and $M$ the mass of the black hole. | ||
| - | This formula shows why black holes are so important and intersting. In this little formula everything comes together: | + | This formula shows why black holes are so important and interesting. In this little formula everything comes together: |
| * Quantum mechanics, in the form of $\hbar$ | * Quantum mechanics, in the form of $\hbar$ | ||
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| <cite>[[https://twitter.com/physicsmatt/status/973780542452793344|Matthew Buckley]]</cite></blockquote> | <cite>[[https://twitter.com/physicsmatt/status/973780542452793344|Matthew Buckley]]</cite></blockquote> | ||
| - | <tabbox Researcher> | + | <tabbox Abstract> |
| <note tip> | <note tip> | ||
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| | | ||
| - | <tabbox Examples> | + | <tabbox Why is it interesting?> |
| - | --> Example1# | + | <blockquote>Among those of us who think about space and time |
| + | professionally, black holes play a central role. [...] Beyond the fascination they hold for astronomers, | ||
| + | black holes are important to science for other reasons. They | ||
| + | are a central object of study for those of us who work on | ||
| + | [[theories:speculative_theories:quantum_gravity|quantum gravity]]. __In a sense, black holes are microscopes of | ||
| + | infinite power which make it possible for us to see the physics | ||
| + | that operates on the Planck scale.__ | ||
| - | + | <cite>Three Roads to Quantum Gravity by Lee Smolin</cite></blockquote> | |
| - | <-- | + | |
| - | --> Example2:# | + | <tabbox History> |
| + | [[https://arxiv.org/abs/1805.02302|Jacob Bekenstein and the Development of Black Hole Thermodynamics]] by Robert M. Wald | ||
| - | <-- | ||
| - | |||
| - | <tabbox FAQ> | ||
| - | | ||
| - | <tabbox History> | ||
| </tabbox> | </tabbox> | ||
advanced_notions/black_hole.1521037877.txt.gz · Last modified: 2018/03/14 14:31 (external edit)
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