Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^3 + 1)y = x^5 + 2x^4 - 3x^2 - x$ | (homogenize, simplify) |
$y^2 + (x^3 + z^3)y = x^5z + 2x^4z^2 - 3x^2z^4 - xz^5$ | (dehomogenize, simplify) |
$y^2 = x^6 + 4x^5 + 8x^4 + 2x^3 - 12x^2 - 4x + 1$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, -1, -3, 0, 2, 1]), R([1, 0, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, -1, -3, 0, 2, 1], R![1, 0, 0, 1]);
sage: X = HyperellipticCurve(R([1, -4, -12, 2, 8, 4, 1]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(14529\) | \(=\) | \( 3 \cdot 29 \cdot 167 \) | magma: Conductor(LSeries(C)); Factorization($1);
|
Discriminant: | \( \Delta \) | \(=\) | \(-392283\) | \(=\) | \( - 3^{4} \cdot 29 \cdot 167 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(340\) | \(=\) | \( 2^{2} \cdot 5 \cdot 17 \) |
\( I_4 \) | \(=\) | \(-8471\) | \(=\) | \( - 43 \cdot 197 \) |
\( I_6 \) | \(=\) | \(-1484651\) | \(=\) | \( - 7^{2} \cdot 41 \cdot 739 \) |
\( I_{10} \) | \(=\) | \(-50212224\) | \(=\) | \( - 2^{7} \cdot 3^{4} \cdot 29 \cdot 167 \) |
\( J_2 \) | \(=\) | \(85\) | \(=\) | \( 5 \cdot 17 \) |
\( J_4 \) | \(=\) | \(654\) | \(=\) | \( 2 \cdot 3 \cdot 109 \) |
\( J_6 \) | \(=\) | \(13708\) | \(=\) | \( 2^{2} \cdot 23 \cdot 149 \) |
\( J_8 \) | \(=\) | \(184366\) | \(=\) | \( 2 \cdot 7 \cdot 13 \cdot 1013 \) |
\( J_{10} \) | \(=\) | \(-392283\) | \(=\) | \( - 3^{4} \cdot 29 \cdot 167 \) |
\( g_1 \) | \(=\) | \(-4437053125/392283\) | ||
\( g_2 \) | \(=\) | \(-133879250/130761\) | ||
\( g_3 \) | \(=\) | \(-99040300/392283\) |
sage: C.igusa_clebsch_invariants(); [factor(a) for a in _]
magma: IgusaClebschInvariants(C); IgusaInvariants(C); G2Invariants(C);
Automorphism group
\(\mathrm{Aut}(X)\) | \(\simeq\) | $C_2$ | magma: AutomorphismGroup(C); IdentifyGroup($1);
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\(\mathrm{Aut}(X_{\overline{\Q}})\) | \(\simeq\) | $C_2$ | magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
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Rational points
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((0 : 0 : 1)\) | \((0 : -1 : 1)\) | \((1 : -1 : 1)\) | \((-2 : 2 : 1)\) |
\((-1 : -2 : 2)\) | \((-2 : 5 : 1)\) | \((-1 : -5 : 2)\) | \((-3 : 5 : 1)\) | \((-3 : 21 : 1)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((0 : 0 : 1)\) | \((0 : -1 : 1)\) | \((1 : -1 : 1)\) | \((-2 : 2 : 1)\) |
\((-1 : -2 : 2)\) | \((-2 : 5 : 1)\) | \((-1 : -5 : 2)\) | \((-3 : 5 : 1)\) | \((-3 : 21 : 1)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((0 : -1 : 1)\) | \((0 : 1 : 1)\) | \((1 : 0 : 1)\) | \((-2 : -3 : 1)\) |
\((-2 : 3 : 1)\) | \((-1 : -3 : 2)\) | \((-1 : 3 : 2)\) | \((-3 : -16 : 1)\) | \((-3 : 16 : 1)\) |
magma: [C![-3,5,1],C![-3,21,1],C![-2,2,1],C![-2,5,1],C![-1,-5,2],C![-1,-2,2],C![0,-1,1],C![0,0,1],C![1,-1,0],C![1,-1,1],C![1,0,0]]; // minimal model
magma: [C![-3,-16,1],C![-3,16,1],C![-2,-3,1],C![-2,3,1],C![-1,-3,2],C![-1,3,2],C![0,-1,1],C![0,1,1],C![1,-1,0],C![1,0,1],C![1,1,0]]; // simplified model
Number of rational Weierstrass points: \(1\)
magma: #Roots(HyperellipticPolynomials(SimplifiedModel(C)));
This curve is locally solvable everywhere.
magma: f,h:=HyperellipticPolynomials(C); g:=4*f+h^2; HasPointsEverywhereLocally(g,2) and (#Roots(ChangeRing(g,RealField())) gt 0 or LeadingCoefficient(g) gt 0);
Mordell-Weil group of the Jacobian
Group structure: \(\Z \oplus \Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-2 : 2 : 1) - (1 : -1 : 0)\) | \(z (x + 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(2z^3\) | \(0.327871\) | \(\infty\) |
\((-2 : 2 : 1) + (0 : 0 : 1) - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x (x + 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-xz^2\) | \(0.033452\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-2 : 2 : 1) - (1 : -1 : 0)\) | \(z (x + 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(2z^3\) | \(0.327871\) | \(\infty\) |
\((-2 : 2 : 1) + (0 : 0 : 1) - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x (x + 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-xz^2\) | \(0.033452\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-2 : -3 : 1) - (1 : -1 : 0)\) | \(z (x + 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + 5z^3\) | \(0.327871\) | \(\infty\) |
\((-2 : -3 : 1) + (0 : 1 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \(x (x + 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 - 2xz^2 + z^3\) | \(0.033452\) | \(\infty\) |
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(2\) |
Mordell-Weil rank: | \(2\) |
2-Selmer rank: | \(2\) |
Regulator: | \( 0.010794 \) |
Real period: | \( 12.89199 \) |
Tamagawa product: | \( 4 \) |
Torsion order: | \( 1 \) |
Leading coefficient: | \( 0.556641 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(3\) | \(1\) | \(4\) | \(4\) | \(( 1 - T )( 1 + 2 T + 3 T^{2} )\) | |
\(29\) | \(1\) | \(1\) | \(1\) | \(( 1 + T )( 1 + 7 T + 29 T^{2} )\) | |
\(167\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 + 2 T + 167 T^{2} )\) |
Galois representations
The mod-$\ell$ Galois representation has maximal image \(\GSp(4,\F_\ell)\) for all primes \( \ell \) except those listed.
Prime \(\ell\) | mod-\(\ell\) image | Is torsion prime? |
---|---|---|
\(2\) | 2.6.1 | no |
Sato-Tate group
\(\mathrm{ST}\) | \(\simeq\) | $\mathrm{USp}(4)$ |
\(\mathrm{ST}^0\) | \(\simeq\) | \(\mathrm{USp}(4)\) |
Decomposition of the Jacobian
Simple over \(\overline{\Q}\)
magma: HeuristicDecompositionFactors(C);
Endomorphisms of the Jacobian
Not of \(\GL_2\)-type over \(\Q\)
Endomorphism ring over \(\Q\):
\(\End (J_{})\) | \(\simeq\) | \(\Z\) |
\(\End (J_{}) \otimes \Q \) | \(\simeq\) | \(\Q\) |
\(\End (J_{}) \otimes \R\) | \(\simeq\) | \(\R\) |
All \(\overline{\Q}\)-endomorphisms of the Jacobian are defined over \(\Q\).
magma: //Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
magma: HeuristicIsGL2(C); HeuristicEndomorphismDescription(C); HeuristicEndomorphismFieldOfDefinition(C);
magma: HeuristicIsGL2(C : Geometric := true); HeuristicEndomorphismDescription(C : Geometric := true); HeuristicEndomorphismLatticeDescription(C);