Example of compact Riemannian manifold with only one geodesic. The 2019 Stack Overflow...
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Example of compact Riemannian manifold with only one geodesic.
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Example of compact Riemannian manifold with only one geodesic.
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Announcing the arrival of Valued Associate #679: Cesar ManaraWhy are we interested in closed geodesics?Existence of geodesic on a compact Riemannian manifoldCompleteness of a Riemannian manifold with boundaryTotally geodesic hypersurface in compact hyperbolic manifoldTriangle equality in a Riemannian manifold implies “geodesic colinearity”?Example for conjugate points with only one connecting geodesicExample for infinitely many points with more than one minimizing geodesic to a point?Examples of compact negatively curved constant curvature manifoldCompact totally geodesic submanifolds in manifold with positive sectional curvatureClosed geodesic on a non-simply connected Riemannian manifold
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The Lyusternik-Fet theorem states that every compact Riemannian manifold has at least one closed geodesic.
Are there any easy-to-construct1 examples of compact Riemannian manifolds for which it is easy to see they only have one closed geodesic?2
If there aren't any such examples, are there any easy-to-construct examples that only have one closed geodesic but where proving this might be difficult?
And if there aren't any examples of this, are there any examples at all of compact manifolds with only one closed geodesic?
1 Of course, the $1$-sphere $S^1$ contains just one closed geodesic, but I'm interested in examples besides this one.
2 By the theorem of the three geodesics, this example cannot be a topological sphere.
differential-geometry examples-counterexamples geodesic
asked 6 hours ago
Peter KageyPeter Kagey
1,59072053
$endgroup$
add a comment |
$begingroup$
The Lyusternik-Fet theorem states that every compact Riemannian manifold has at least one closed geodesic.
Are there any easy-to-construct1 examples of compact Riemannian manifolds for which it is easy to see they only have one closed geodesic?2
If there aren't any such examples, are there any easy-to-construct examples that only have one closed geodesic but where proving this might be difficult?
And if there aren't any examples of this, are there any examples at all of compact manifolds with only one closed geodesic?
1 Of course, the $1$-sphere $S^1$ contains just one closed geodesic, but I'm interested in examples besides this one.
2 By the theorem of the three geodesics, this example cannot be a topological sphere.
differential-geometry examples-counterexamples geodesic
asked 6 hours ago
Peter KageyPeter Kagey
1,59072053
$endgroup$
add a comment |
$begingroup$
The Lyusternik-Fet theorem states that every compact Riemannian manifold has at least one closed geodesic.
Are there any easy-to-construct1 examples of compact Riemannian manifolds for which it is easy to see they only have one closed geodesic?2
If there aren't any such examples, are there any easy-to-construct examples that only have one closed geodesic but where proving this might be difficult?
And if there aren't any examples of this, are there any examples at all of compact manifolds with only one closed geodesic?
1 Of course, the $1$-sphere $S^1$ contains just one closed geodesic, but I'm interested in examples besides this one.
2 By the theorem of the three geodesics, this example cannot be a topological sphere.
differential-geometry examples-counterexamples geodesic
asked 6 hours ago
Peter KageyPeter Kagey
1,59072053
$endgroup$
The Lyusternik-Fet theorem states that every compact Riemannian manifold has at least one closed geodesic.
Are there any easy-to-construct1 examples of compact Riemannian manifolds for which it is easy to see they only have one closed geodesic?2
If there aren't any such examples, are there any easy-to-construct examples that only have one closed geodesic but where proving this might be difficult?
And if there aren't any examples of this, are there any examples at all of compact manifolds with only one closed geodesic?
1 Of course, the $1$-sphere $S^1$ contains just one closed geodesic, but I'm interested in examples besides this one.
2 By the theorem of the three geodesics, this example cannot be a topological sphere.
differential-geometry examples-counterexamples geodesic
differential-geometry examples-counterexamples geodesic
asked 6 hours ago
Peter KageyPeter Kagey
1,59072053
asked 6 hours ago
Peter KageyPeter Kagey
1,59072053
edited 6 hours ago
Peter Kagey
asked 6 hours ago
Peter KageyPeter Kagey
1,59072053
asked 6 hours ago
Peter KageyPeter Kagey
1,59072053
asked 6 hours ago
Peter KageyPeter Kagey
1,59072053
1,59072053
add a comment |
add a comment |
2 Answers
2
active
oldest
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First of all, you have to exclude constant maps $S^1to M$ from consideration: They are all closed geodesics. Secondly, you have to talk about geometrically distinct closed geodesics: Geodesics which have the same image are regarded as "the same". Then, it is a notorious conjecture/open problem:
Conjecture. Every compact Riemannian manifold of dimension $n >1$ contains infinitely many geometrically distinct nonconstant geodesics.
See for instance this survey article by Burns and Matveev.
This is even unknown if $M$ is diffeomorphic to the sphere $S^n$, $nge 3$.
answered 6 hours ago
Moishe KohanMoishe Kohan
48.7k344110
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add a comment |
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If you analyze the geodesics using Clairaut's relation, you'll find that the only closed geodesic on a hyperboloid of one sheet is the central circle. Indeed, the same holds for a concave surface of revolution of the same "shape" as the hyperboloid of one sheet.
EDIT: Apologies for missing the crucial compactness hypothesis.
answered 6 hours ago
Ted ShifrinTed Shifrin
65k44792
$endgroup$
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
6 hours ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
6 hours ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
6 hours ago
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
First of all, you have to exclude constant maps $S^1to M$ from consideration: They are all closed geodesics. Secondly, you have to talk about geometrically distinct closed geodesics: Geodesics which have the same image are regarded as "the same". Then, it is a notorious conjecture/open problem:
Conjecture. Every compact Riemannian manifold of dimension $n >1$ contains infinitely many geometrically distinct nonconstant geodesics.
See for instance this survey article by Burns and Matveev.
This is even unknown if $M$ is diffeomorphic to the sphere $S^n$, $nge 3$.
answered 6 hours ago
Moishe KohanMoishe Kohan
48.7k344110
$endgroup$
add a comment |
$begingroup$
First of all, you have to exclude constant maps $S^1to M$ from consideration: They are all closed geodesics. Secondly, you have to talk about geometrically distinct closed geodesics: Geodesics which have the same image are regarded as "the same". Then, it is a notorious conjecture/open problem:
Conjecture. Every compact Riemannian manifold of dimension $n >1$ contains infinitely many geometrically distinct nonconstant geodesics.
See for instance this survey article by Burns and Matveev.
This is even unknown if $M$ is diffeomorphic to the sphere $S^n$, $nge 3$.
answered 6 hours ago
Moishe KohanMoishe Kohan
48.7k344110
$endgroup$
add a comment |
$begingroup$
First of all, you have to exclude constant maps $S^1to M$ from consideration: They are all closed geodesics. Secondly, you have to talk about geometrically distinct closed geodesics: Geodesics which have the same image are regarded as "the same". Then, it is a notorious conjecture/open problem:
Conjecture. Every compact Riemannian manifold of dimension $n >1$ contains infinitely many geometrically distinct nonconstant geodesics.
See for instance this survey article by Burns and Matveev.
This is even unknown if $M$ is diffeomorphic to the sphere $S^n$, $nge 3$.
answered 6 hours ago
Moishe KohanMoishe Kohan
48.7k344110
$endgroup$
First of all, you have to exclude constant maps $S^1to M$ from consideration: They are all closed geodesics. Secondly, you have to talk about geometrically distinct closed geodesics: Geodesics which have the same image are regarded as "the same". Then, it is a notorious conjecture/open problem:
Conjecture. Every compact Riemannian manifold of dimension $n >1$ contains infinitely many geometrically distinct nonconstant geodesics.
See for instance this survey article by Burns and Matveev.
This is even unknown if $M$ is diffeomorphic to the sphere $S^n$, $nge 3$.
answered 6 hours ago
Moishe KohanMoishe Kohan
48.7k344110
edited 6 hours ago
answered 6 hours ago
Moishe KohanMoishe Kohan
48.7k344110
answered 6 hours ago
Moishe KohanMoishe Kohan
48.7k344110
answered 6 hours ago
Moishe KohanMoishe Kohan
48.7k344110
48.7k344110
add a comment |
add a comment |
$begingroup$
If you analyze the geodesics using Clairaut's relation, you'll find that the only closed geodesic on a hyperboloid of one sheet is the central circle. Indeed, the same holds for a concave surface of revolution of the same "shape" as the hyperboloid of one sheet.
EDIT: Apologies for missing the crucial compactness hypothesis.
answered 6 hours ago
Ted ShifrinTed Shifrin
65k44792
$endgroup$
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
6 hours ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
6 hours ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
6 hours ago
add a comment |
$begingroup$
If you analyze the geodesics using Clairaut's relation, you'll find that the only closed geodesic on a hyperboloid of one sheet is the central circle. Indeed, the same holds for a concave surface of revolution of the same "shape" as the hyperboloid of one sheet.
EDIT: Apologies for missing the crucial compactness hypothesis.
answered 6 hours ago
Ted ShifrinTed Shifrin
65k44792
$endgroup$
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
6 hours ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
6 hours ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
6 hours ago
add a comment |
$begingroup$
If you analyze the geodesics using Clairaut's relation, you'll find that the only closed geodesic on a hyperboloid of one sheet is the central circle. Indeed, the same holds for a concave surface of revolution of the same "shape" as the hyperboloid of one sheet.
EDIT: Apologies for missing the crucial compactness hypothesis.
answered 6 hours ago
Ted ShifrinTed Shifrin
65k44792
$endgroup$
If you analyze the geodesics using Clairaut's relation, you'll find that the only closed geodesic on a hyperboloid of one sheet is the central circle. Indeed, the same holds for a concave surface of revolution of the same "shape" as the hyperboloid of one sheet.
EDIT: Apologies for missing the crucial compactness hypothesis.
answered 6 hours ago
Ted ShifrinTed Shifrin
65k44792
edited 6 hours ago
answered 6 hours ago
Ted ShifrinTed Shifrin
65k44792
answered 6 hours ago
Ted ShifrinTed Shifrin
65k44792
answered 6 hours ago
Ted ShifrinTed Shifrin
65k44792
65k44792
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
6 hours ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
6 hours ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
6 hours ago
add a comment |
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
6 hours ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
6 hours ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
6 hours ago
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
6 hours ago
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
6 hours ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
6 hours ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
6 hours ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
6 hours ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
6 hours ago
add a comment |
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