Minimal equation
Minimal equation
Simplified equation
$y^2 + y = -x^6 - 3x^5 - 8x^4 - 11x^3 - 14x^2 - 9x - 6$ | (homogenize, simplify) |
$y^2 + z^3y = -x^6 - 3x^5z - 8x^4z^2 - 11x^3z^3 - 14x^2z^4 - 9xz^5 - 6z^6$ | (dehomogenize, simplify) |
$y^2 = -4x^6 - 12x^5 - 32x^4 - 44x^3 - 56x^2 - 36x - 23$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([-6, -9, -14, -11, -8, -3, -1]), R([1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![-6, -9, -14, -11, -8, -3, -1], R![1]);
sage: X = HyperellipticCurve(R([-23, -36, -56, -44, -32, -12, -4]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(1083\) | \(=\) | \( 3 \cdot 19^{2} \) | magma: Conductor(LSeries(C)); Factorization($1);
|
Discriminant: | \( \Delta \) | \(=\) | \(-87723\) | \(=\) | \( - 3^{5} \cdot 19^{2} \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(5464\) | \(=\) | \( 2^{3} \cdot 683 \) |
\( I_4 \) | \(=\) | \(8692\) | \(=\) | \( 2^{2} \cdot 41 \cdot 53 \) |
\( I_6 \) | \(=\) | \(15768656\) | \(=\) | \( 2^{4} \cdot 17 \cdot 57973 \) |
\( I_{10} \) | \(=\) | \(350892\) | \(=\) | \( 2^{2} \cdot 3^{5} \cdot 19^{2} \) |
\( J_2 \) | \(=\) | \(2732\) | \(=\) | \( 2^{2} \cdot 683 \) |
\( J_4 \) | \(=\) | \(309544\) | \(=\) | \( 2^{3} \cdot 38693 \) |
\( J_6 \) | \(=\) | \(46549080\) | \(=\) | \( 2^{3} \cdot 3^{5} \cdot 5 \cdot 4789 \) |
\( J_8 \) | \(=\) | \(7838649656\) | \(=\) | \( 2^{3} \cdot 29 \cdot 107 \cdot 337 \cdot 937 \) |
\( J_{10} \) | \(=\) | \(87723\) | \(=\) | \( 3^{5} \cdot 19^{2} \) |
\( g_1 \) | \(=\) | \(152196082896530432/87723\) | ||
\( g_2 \) | \(=\) | \(6311963449851392/87723\) | ||
\( g_3 \) | \(=\) | \(1429770125440/361\) |
sage: C.igusa_clebsch_invariants(); [factor(a) for a in _]
magma: IgusaClebschInvariants(C); IgusaInvariants(C); G2Invariants(C);
Automorphism group
\(\mathrm{Aut}(X)\) | \(\simeq\) | $C_2^2$ | magma: AutomorphismGroup(C); IdentifyGroup($1);
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\(\mathrm{Aut}(X_{\overline{\Q}})\) | \(\simeq\) | $C_2^2$ | magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
|
Rational points
This curve has no rational points.
magma: []; // minimal model
magma: []; // simplified model
Number of rational Weierstrass points: \(0\)
magma: #Roots(HyperellipticPolynomials(SimplifiedModel(C)));
This curve is locally solvable except over $\R$.
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: \(\Z/{15}\Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - D_\infty\) | \(x^2 + 2z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(xz^2\) | \(0\) | \(15\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - D_\infty\) | \(x^2 + 2z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(xz^2\) | \(0\) | \(15\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - D_\infty\) | \(x^2 + 2z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(2xz^2 + z^3\) | \(0\) | \(15\) |
BSD invariants
Hasse-Weil conjecture: | verified |
Analytic rank: | \(0\) |
Mordell-Weil rank: | \(0\) |
2-Selmer rank: | \(1\) |
Regulator: | \( 1 \) |
Real period: | \( 5.981340 \) |
Tamagawa product: | \( 5 \) |
Torsion order: | \( 15 \) |
Leading coefficient: | \( 0.265837 \) |
Analytic order of Ш: | \( 2 \) (rounded) |
Order of Ш: | twice a square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(3\) | \(1\) | \(5\) | \(5\) | \(( 1 - T )( 1 + 2 T + 3 T^{2} )\) | |
\(19\) | \(2\) | \(2\) | \(1\) | \(( 1 - T )( 1 + T )\) |
Galois representations
For primes $\ell \ge 5$ the Galois representation data has not been computed for this curve since it is not generic.
For primes $\ell \le 3$, the image of the mod-$\ell$ Galois representation is listed in the table below, whenever it is not all of $\GSp(4,\F_\ell)$.
Prime \(\ell\) | mod-\(\ell\) image | Is torsion prime? |
---|---|---|
\(2\) | 2.15.2 | no |
\(3\) | 3.720.4 | yes |
Sato-Tate group
\(\mathrm{ST}\) | \(\simeq\) | $\mathrm{SU}(2)\times\mathrm{SU}(2)$ |
\(\mathrm{ST}^0\) | \(\simeq\) | \(\mathrm{SU}(2)\times\mathrm{SU}(2)\) |
Decomposition of the Jacobian
Splits over \(\Q\)
Decomposes up to isogeny as the product of the non-isogenous elliptic curve isogeny classes:
Elliptic curve isogeny class 19.a
Elliptic curve isogeny class 57.b
magma: HeuristicDecompositionFactors(C);
Endomorphisms of the Jacobian
Of \(\GL_2\)-type over \(\Q\)
Endomorphism ring over \(\Q\):
\(\End (J_{})\) | \(\simeq\) | an order of index \(2\) in \(\Z \times \Z\) |
\(\End (J_{}) \otimes \Q \) | \(\simeq\) | \(\Q\) \(\times\) \(\Q\) |
\(\End (J_{}) \otimes \R\) | \(\simeq\) | \(\R \times \R\) |
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);