Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^2 + x + 1)y = 4x^5 + 9x^4 + 48x^3 - 4x^2 - 53x - 21$ | (homogenize, simplify) |
$y^2 + (x^2z + xz^2 + z^3)y = 4x^5z + 9x^4z^2 + 48x^3z^3 - 4x^2z^4 - 53xz^5 - 21z^6$ | (dehomogenize, simplify) |
$y^2 = 16x^5 + 37x^4 + 194x^3 - 13x^2 - 210x - 83$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([-21, -53, -4, 48, 9, 4]), R([1, 1, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![-21, -53, -4, 48, 9, 4], R![1, 1, 1]);
sage: X = HyperellipticCurve(R([-83, -210, -13, 194, 37, 16]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(604\) | \(=\) | \( 2^{2} \cdot 151 \) | magma: Conductor(LSeries(C)); Factorization($1);
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Discriminant: | \( \Delta \) | \(=\) | \(9664\) | \(=\) | \( 2^{6} \cdot 151 \) | magma: Discriminant(C); Factorization(Integers()!$1);
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Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(49556\) | \(=\) | \( 2^{2} \cdot 13 \cdot 953 \) |
\( I_4 \) | \(=\) | \(-797087975\) | \(=\) | \( - 5^{2} \cdot 457 \cdot 69767 \) |
\( I_6 \) | \(=\) | \(-23996873337603\) | \(=\) | \( - 3 \cdot 20747 \cdot 385547683 \) |
\( I_{10} \) | \(=\) | \(1236992\) | \(=\) | \( 2^{13} \cdot 151 \) |
\( J_2 \) | \(=\) | \(12389\) | \(=\) | \( 13 \cdot 953 \) |
\( J_4 \) | \(=\) | \(39607304\) | \(=\) | \( 2^{3} \cdot 11 \cdot 450083 \) |
\( J_6 \) | \(=\) | \(223396249616\) | \(=\) | \( 2^{4} \cdot 10289 \cdot 1357009 \) |
\( J_8 \) | \(=\) | \(299729401586052\) | \(=\) | \( 2^{2} \cdot 3 \cdot 2971 \cdot 8407085201 \) |
\( J_{10} \) | \(=\) | \(9664\) | \(=\) | \( 2^{6} \cdot 151 \) |
\( g_1 \) | \(=\) | \(291864493641401980949/9664\) | ||
\( g_2 \) | \(=\) | \(9414430497536890397/1208\) | ||
\( g_3 \) | \(=\) | \(2143030742187944921/604\) |
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
All points: \((1 : 0 : 0)\)
magma: [C![1,0,0]]; // minimal model
magma: [C![1,0,0]]; // 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: trivial
magma: MordellWeilGroupGenus2(Jacobian(C));
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(0\) |
Mordell-Weil rank: | \(0\) |
2-Selmer rank: | \(0\) |
Regulator: | \( 1 \) |
Real period: | \( 0.291788 \) |
Tamagawa product: | \( 1 \) |
Torsion order: | \( 1 \) |
Leading coefficient: | \( 0.291788 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(2\) | \(6\) | \(1\) | \(( 1 - T )( 1 + T )\) | |
\(151\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 + 10 T + 151 T^{2} )\) |
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 |
\(3\) | 3.720.5 | 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);