Minimal equation
Minimal equation
Simplified equation
$y^2 + y = -x^6 - 8x^4 - 18x^2 - 8$ | (homogenize, simplify) |
$y^2 + z^3y = -x^6 - 8x^4z^2 - 18x^2z^4 - 8z^6$ | (dehomogenize, simplify) |
$y^2 = -4x^6 - 32x^4 - 72x^2 - 31$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([-8, 0, -18, 0, -8, 0, -1]), R([1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![-8, 0, -18, 0, -8, 0, -1], R![1]);
sage: X = HyperellipticCurve(R([-31, 0, -72, 0, -32, 0, -4]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(679024\) | \(=\) | \( 2^{4} \cdot 31 \cdot 37^{2} \) | magma: Conductor(LSeries(C)); Factorization($1);
|
Discriminant: | \( \Delta \) | \(=\) | \(-679024\) | \(=\) | \( - 2^{4} \cdot 31 \cdot 37^{2} \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(8328\) | \(=\) | \( 2^{3} \cdot 3 \cdot 347 \) |
\( I_4 \) | \(=\) | \(352725\) | \(=\) | \( 3 \cdot 5^{2} \cdot 4703 \) |
\( I_6 \) | \(=\) | \(909501207\) | \(=\) | \( 3 \cdot 17^{2} \cdot 719 \cdot 1459 \) |
\( I_{10} \) | \(=\) | \(84878\) | \(=\) | \( 2 \cdot 31 \cdot 37^{2} \) |
\( J_2 \) | \(=\) | \(8328\) | \(=\) | \( 2^{3} \cdot 3 \cdot 347 \) |
\( J_4 \) | \(=\) | \(2654666\) | \(=\) | \( 2 \cdot 7 \cdot 189619 \) |
\( J_6 \) | \(=\) | \(1072556352\) | \(=\) | \( 2^{6} \cdot 3^{2} \cdot 7 \cdot 31 \cdot 8581 \) |
\( J_8 \) | \(=\) | \(471249431975\) | \(=\) | \( 5^{2} \cdot 7 \cdot 2692853897 \) |
\( J_{10} \) | \(=\) | \(679024\) | \(=\) | \( 2^{4} \cdot 31 \cdot 37^{2} \) |
\( g_1 \) | \(=\) | \(2503707555146139648/42439\) | ||
\( g_2 \) | \(=\) | \(95832331547948352/42439\) | ||
\( g_3 \) | \(=\) | \(149975347108608/1369\) |
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 $\R$ and $\Q_{3}$.
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: \(\Z/{3}\Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - D_\infty\) | \(x^2 + 4z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0\) | \(3\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - D_\infty\) | \(x^2 + 4z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0\) | \(3\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - D_\infty\) | \(x^2 + 4z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(z^3\) | \(0\) | \(3\) |
BSD invariants
Hasse-Weil conjecture: | verified |
Analytic rank: | \(0\) |
Mordell-Weil rank: | \(0\) |
2-Selmer rank: | \(3\) |
Regulator: | \( 1 \) |
Real period: | \( 2.993255 \) |
Tamagawa product: | \( 1 \) |
Torsion order: | \( 3 \) |
Leading coefficient: | \( 2.660671 \) |
Analytic order of Ш: | \( 8 \) (rounded) |
Order of Ш: | twice a square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(4\) | \(4\) | \(1\) | \(1 + 2 T^{2}\) | |
\(31\) | \(1\) | \(1\) | \(1\) | \(( 1 + T )( 1 + 4 T + 31 T^{2} )\) | |
\(37\) | \(2\) | \(2\) | \(1\) | \(( 1 - T )( 1 + T )\) |
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 18352.n
Elliptic curve isogeny class 37.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);