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What is a theory of gravity?
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Let me introduce this question by noting that my training is in condensed matter physics, and my familiarity with gravity is superficial at best. Hence, this question may be somewhat naive.
In addition to the usual Einstein gravity that apparently governs our universe at long wavelengths, I have seen several different gravity theories discussed in literature. For example, I have heard of supergravity, topological gravity, bimetric gravity, W gravity, and maybe others. My question is: what makes a theory gravitational? It seems obvious to me that any theory that wants to call itself gravity better have a dynamical spacetime metric (correct me if I'm wrong). Is there any other ingredient that is essential to gravity?
Some corollary questions: Do all gravity theories have black holes? If so do they behave like black holes in Einstein gravity (e.g., obey the Bekenstein-Hawking formula)? Can all gravity theories be realized as string theories?
general-relativity gravity string-theory supergravity
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d_b
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up vote
3
down vote
favorite
Let me introduce this question by noting that my training is in condensed matter physics, and my familiarity with gravity is superficial at best. Hence, this question may be somewhat naive.
In addition to the usual Einstein gravity that apparently governs our universe at long wavelengths, I have seen several different gravity theories discussed in literature. For example, I have heard of supergravity, topological gravity, bimetric gravity, W gravity, and maybe others. My question is: what makes a theory gravitational? It seems obvious to me that any theory that wants to call itself gravity better have a dynamical spacetime metric (correct me if I'm wrong). Is there any other ingredient that is essential to gravity?
Some corollary questions: Do all gravity theories have black holes? If so do they behave like black holes in Einstein gravity (e.g., obey the Bekenstein-Hawking formula)? Can all gravity theories be realized as string theories?
general-relativity gravity string-theory supergravity
asked 4 hours ago
d_b
893614
add a comment |
up vote
3
down vote
favorite
up vote
3
down vote
favorite
Let me introduce this question by noting that my training is in condensed matter physics, and my familiarity with gravity is superficial at best. Hence, this question may be somewhat naive.
In addition to the usual Einstein gravity that apparently governs our universe at long wavelengths, I have seen several different gravity theories discussed in literature. For example, I have heard of supergravity, topological gravity, bimetric gravity, W gravity, and maybe others. My question is: what makes a theory gravitational? It seems obvious to me that any theory that wants to call itself gravity better have a dynamical spacetime metric (correct me if I'm wrong). Is there any other ingredient that is essential to gravity?
Some corollary questions: Do all gravity theories have black holes? If so do they behave like black holes in Einstein gravity (e.g., obey the Bekenstein-Hawking formula)? Can all gravity theories be realized as string theories?
general-relativity gravity string-theory supergravity
asked 4 hours ago
d_b
893614
Let me introduce this question by noting that my training is in condensed matter physics, and my familiarity with gravity is superficial at best. Hence, this question may be somewhat naive.
In addition to the usual Einstein gravity that apparently governs our universe at long wavelengths, I have seen several different gravity theories discussed in literature. For example, I have heard of supergravity, topological gravity, bimetric gravity, W gravity, and maybe others. My question is: what makes a theory gravitational? It seems obvious to me that any theory that wants to call itself gravity better have a dynamical spacetime metric (correct me if I'm wrong). Is there any other ingredient that is essential to gravity?
Some corollary questions: Do all gravity theories have black holes? If so do they behave like black holes in Einstein gravity (e.g., obey the Bekenstein-Hawking formula)? Can all gravity theories be realized as string theories?
general-relativity gravity string-theory supergravity
general-relativity gravity string-theory supergravity
asked 4 hours ago
d_b
893614
asked 4 hours ago
d_b
893614
asked 4 hours ago
d_b
893614
asked 4 hours ago
d_b
893614
asked 4 hours ago
d_b
893614
893614
add a comment |
add a comment |
1 Answer
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As an operational definition, a theory of gravity is a theory that reduces to the known working descriptions of gravity (Newtonian gravity, General Relativity) in some limit.
(If you think this is a pithy answer, try to come up with anything more specific that applies to e.g. MOND, String theory and Loop quantum gravity at the same time.)
answered 3 hours ago
ACuriousMind♦
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1 Answer
1
active
oldest
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
4
down vote
As an operational definition, a theory of gravity is a theory that reduces to the known working descriptions of gravity (Newtonian gravity, General Relativity) in some limit.
(If you think this is a pithy answer, try to come up with anything more specific that applies to e.g. MOND, String theory and Loop quantum gravity at the same time.)
answered 3 hours ago
ACuriousMind♦
69.1k17118296
add a comment |
up vote
4
down vote
As an operational definition, a theory of gravity is a theory that reduces to the known working descriptions of gravity (Newtonian gravity, General Relativity) in some limit.
(If you think this is a pithy answer, try to come up with anything more specific that applies to e.g. MOND, String theory and Loop quantum gravity at the same time.)
answered 3 hours ago
ACuriousMind♦
69.1k17118296
add a comment |
up vote
4
down vote
up vote
4
down vote
As an operational definition, a theory of gravity is a theory that reduces to the known working descriptions of gravity (Newtonian gravity, General Relativity) in some limit.
(If you think this is a pithy answer, try to come up with anything more specific that applies to e.g. MOND, String theory and Loop quantum gravity at the same time.)
answered 3 hours ago
ACuriousMind♦
69.1k17118296
As an operational definition, a theory of gravity is a theory that reduces to the known working descriptions of gravity (Newtonian gravity, General Relativity) in some limit.
(If you think this is a pithy answer, try to come up with anything more specific that applies to e.g. MOND, String theory and Loop quantum gravity at the same time.)
answered 3 hours ago
ACuriousMind♦
69.1k17118296
answered 3 hours ago
ACuriousMind♦
69.1k17118296
answered 3 hours ago
ACuriousMind♦
69.1k17118296
answered 3 hours ago
ACuriousMind♦
69.1k17118296
69.1k17118296
add a comment |
add a comment |
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