Example of compact Riemannian manifold with only one geodesic. The 2019 Stack Overflow Developer Survey Results Are In Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)Why 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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Example of compact Riemannian manifold with only one geodesic.
The 2019 Stack Overflow Developer Survey Results Are In
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)Why 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
$begingroup$
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 1 hour ago
Peter KageyPeter Kagey
1,57072053
$endgroup$
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 1 hour ago
Peter KageyPeter Kagey
1,57072053
$endgroup$
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 1 hour ago
Peter KageyPeter Kagey
1,57072053
$endgroup$
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 1 hour ago
Peter KageyPeter Kagey
1,57072053
asked 1 hour ago
Peter KageyPeter Kagey
1,57072053
edited 1 hour ago
Peter Kagey
asked 1 hour ago
Peter KageyPeter Kagey
1,57072053
asked 1 hour ago
Peter KageyPeter Kagey
1,57072053
asked 1 hour ago
Peter KageyPeter Kagey
1,57072053
1,57072053
add a comment |
add a comment |
2 Answers
2
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 1 hour ago
Moishe KohanMoishe Kohan
48.6k344110
$endgroup$
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 1 hour ago
Ted ShifrinTed Shifrin
65k44792
$endgroup$
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
1 hour ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
1 hour ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
1 hour ago
add a comment |
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2 Answers
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active
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2 Answers
2
active
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$begingroup$
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 1 hour ago
Moishe KohanMoishe Kohan
48.6k344110
$endgroup$
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 1 hour ago
Moishe KohanMoishe Kohan
48.6k344110
$endgroup$
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 1 hour ago
Moishe KohanMoishe Kohan
48.6k344110
$endgroup$
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 1 hour ago
Moishe KohanMoishe Kohan
48.6k344110
edited 45 mins ago
answered 1 hour ago
Moishe KohanMoishe Kohan
48.6k344110
answered 1 hour ago
Moishe KohanMoishe Kohan
48.6k344110
answered 1 hour ago
Moishe KohanMoishe Kohan
48.6k344110
48.6k344110
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 1 hour ago
Ted ShifrinTed Shifrin
65k44792
$endgroup$
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
1 hour ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
1 hour ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
1 hour 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 1 hour ago
Ted ShifrinTed Shifrin
65k44792
$endgroup$
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
1 hour ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
1 hour ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
1 hour 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 1 hour 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 1 hour ago
Ted ShifrinTed Shifrin
65k44792
edited 1 hour ago
answered 1 hour ago
Ted ShifrinTed Shifrin
65k44792
answered 1 hour ago
Ted ShifrinTed Shifrin
65k44792
answered 1 hour ago
Ted ShifrinTed Shifrin
65k44792
65k44792
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
1 hour ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
1 hour ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
1 hour ago
add a comment |
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
1 hour ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
1 hour ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
1 hour ago
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
1 hour ago
$begingroup$
Lovely example, but a hyperboloid isn't compact, right?
$endgroup$
– Peter Kagey
1 hour ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
1 hour ago
$begingroup$
Oops. Sloppy reading. I'll delete.
$endgroup$
– Ted Shifrin
1 hour ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
1 hour ago
$begingroup$
It's a nice example; you should leave it.
$endgroup$
– Peter Kagey
1 hour ago
add a comment |
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