Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^3 + x)y = 4x^4 + 27x^2 + 56$ | (homogenize, simplify) |
$y^2 + (x^3 + xz^2)y = 4x^4z^2 + 27x^2z^4 + 56z^6$ | (dehomogenize, simplify) |
$y^2 = x^6 + 18x^4 + 109x^2 + 224$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([56, 0, 27, 0, 4]), R([0, 1, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![56, 0, 27, 0, 4], R![0, 1, 0, 1]);
sage: X = HyperellipticCurve(R([224, 0, 109, 0, 18, 0, 1]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(784\) | \(=\) | \( 2^{4} \cdot 7^{2} \) | magma: Conductor(LSeries(C)); Factorization($1);
|
Discriminant: | \( \Delta \) | \(=\) | \(-43904\) | \(=\) | \( - 2^{7} \cdot 7^{3} \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(21288\) | \(=\) | \( 2^{3} \cdot 3 \cdot 887 \) |
\( I_4 \) | \(=\) | \(3000\) | \(=\) | \( 2^{3} \cdot 3 \cdot 5^{3} \) |
\( I_6 \) | \(=\) | \(20891172\) | \(=\) | \( 2^{2} \cdot 3 \cdot 1740931 \) |
\( I_{10} \) | \(=\) | \(175616\) | \(=\) | \( 2^{9} \cdot 7^{3} \) |
\( J_2 \) | \(=\) | \(10644\) | \(=\) | \( 2^{2} \cdot 3 \cdot 887 \) |
\( J_4 \) | \(=\) | \(4720114\) | \(=\) | \( 2 \cdot 7 \cdot 233 \cdot 1447 \) |
\( J_6 \) | \(=\) | \(2790613504\) | \(=\) | \( 2^{9} \cdot 7^{2} \cdot 41 \cdot 2713 \) |
\( J_8 \) | \(=\) | \(1855953490895\) | \(=\) | \( 5 \cdot 7^{2} \cdot 727 \cdot 10419973 \) |
\( J_{10} \) | \(=\) | \(43904\) | \(=\) | \( 2^{7} \cdot 7^{3} \) |
\( g_1 \) | \(=\) | \(1067368445729034408/343\) | ||
\( g_2 \) | \(=\) | \(6352710665144931/49\) | ||
\( g_3 \) | \(=\) | \(50408453477952/7\) |
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);
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Rational points
All points: \((1 : 0 : 0),\, (1 : -1 : 0)\)
magma: [C![1,-1,0],C![1,0,0]]; // minimal model
magma: [C![1,-1,0],C![1,1,0]]; // simplified model
Number of rational Weierstrass points: \(0\)
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: \(\Z/{12}\Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\) | \(2x^2 + xz + 11z^2\) | \(=\) | \(0,\) | \(4y\) | \(=\) | \(9xz^2 - 7z^3\) | \(0\) | \(12\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\) | \(2x^2 + xz + 11z^2\) | \(=\) | \(0,\) | \(4y\) | \(=\) | \(9xz^2 - 7z^3\) | \(0\) | \(12\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - (1 : -1 : 0) - (1 : 1 : 0)\) | \(2x^2 + xz + 11z^2\) | \(=\) | \(0,\) | \(4y\) | \(=\) | \(x^3 + 19xz^2 - 14z^3\) | \(0\) | \(12\) |
BSD invariants
Hasse-Weil conjecture: | verified |
Analytic rank: | \(0\) |
Mordell-Weil rank: | \(0\) |
2-Selmer rank: | \(1\) |
Regulator: | \( 1 \) |
Real period: | \( 6.931117 \) |
Tamagawa product: | \( 6 \) |
Torsion order: | \( 12 \) |
Leading coefficient: | \( 0.288796 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(4\) | \(7\) | \(2\) | \(1 + T\) | |
\(7\) | \(2\) | \(3\) | \(3\) | \(( 1 - T )( 1 + T )\) |
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? |
---|---|---|
\(2\) | 2.90.1 | yes |
\(3\) | 3.2160.20 | 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 56.a
Elliptic curve isogeny class 14.a
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);