Properties

Label 10895.a.54475.1
Conductor $10895$
Discriminant $54475$
Mordell-Weil group \(\Z \oplus \Z\)
Sato-Tate group $\mathrm{USp}(4)$
\(\End(J_{\overline{\Q}}) \otimes \R\) \(\R\)
\(\End(J_{\overline{\Q}}) \otimes \Q\) \(\Q\)
\(\End(J) \otimes \Q\) \(\Q\)
\(\overline{\Q}\)-simple yes
\(\mathrm{GL}_2\)-type no

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Minimal equation

Minimal equation

Simplified equation

$y^2 + (x^2 + x + 1)y = -x^5 + 2x^4 - 3x^3$ (homogenize, simplify)
$y^2 + (x^2z + xz^2 + z^3)y = -x^5z + 2x^4z^2 - 3x^3z^3$ (dehomogenize, simplify)
$y^2 = -4x^5 + 9x^4 - 10x^3 + 3x^2 + 2x + 1$ (homogenize, minimize)

sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, 0, 0, -3, 2, -1]), R([1, 1, 1]));
 
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, 0, 0, -3, 2, -1], R![1, 1, 1]);
 
sage: X = HyperellipticCurve(R([1, 2, 3, -10, 9, -4]))
 
magma: X,pi:= SimplifiedModel(C);
 

Invariants

Conductor: \( N \)  \(=\)  \(10895\) \(=\) \( 5 \cdot 2179 \)
magma: Conductor(LSeries(C)); Factorization($1);
 
Discriminant: \( \Delta \)  \(=\)  \(54475\) \(=\) \( 5^{2} \cdot 2179 \)
magma: Discriminant(C); Factorization(Integers()!$1);
 

Igusa-Clebsch invariants

Igusa invariants

G2 invariants

\( I_2 \)  \(=\) \(76\) \(=\)  \( 2^{2} \cdot 19 \)
\( I_4 \)  \(=\) \(-8039\) \(=\)  \( -8039 \)
\( I_6 \)  \(=\) \(-186909\) \(=\)  \( - 3 \cdot 62303 \)
\( I_{10} \)  \(=\) \(-6972800\) \(=\)  \( - 2^{7} \cdot 5^{2} \cdot 2179 \)
\( J_2 \)  \(=\) \(19\) \(=\)  \( 19 \)
\( J_4 \)  \(=\) \(350\) \(=\)  \( 2 \cdot 5^{2} \cdot 7 \)
\( J_6 \)  \(=\) \(844\) \(=\)  \( 2^{2} \cdot 211 \)
\( J_8 \)  \(=\) \(-26616\) \(=\)  \( - 2^{3} \cdot 3 \cdot 1109 \)
\( J_{10} \)  \(=\) \(-54475\) \(=\)  \( - 5^{2} \cdot 2179 \)
\( g_1 \)  \(=\) \(-2476099/54475\)
\( g_2 \)  \(=\) \(-96026/2179\)
\( g_3 \)  \(=\) \(-304684/54475\)

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);
 
\(\mathrm{Aut}(X_{\overline{\Q}})\)\(\simeq\) $C_2$
magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
 

Rational points

Known points
\((1 : 0 : 0)\) \((0 : 0 : 1)\) \((0 : -1 : 1)\) \((1 : -1 : 1)\) \((-1 : 2 : 1)\) \((1 : -2 : 1)\)
\((-1 : -3 : 1)\) \((1 : -2 : 4)\) \((-2 : 8 : 1)\) \((-2 : -11 : 1)\) \((1 : -82 : 4)\)
Known points
\((1 : 0 : 0)\) \((0 : 0 : 1)\) \((0 : -1 : 1)\) \((1 : -1 : 1)\) \((-1 : 2 : 1)\) \((1 : -2 : 1)\)
\((-1 : -3 : 1)\) \((1 : -2 : 4)\) \((-2 : 8 : 1)\) \((-2 : -11 : 1)\) \((1 : -82 : 4)\)
Known points
\((1 : 0 : 0)\) \((0 : -1 : 1)\) \((0 : 1 : 1)\) \((1 : -1 : 1)\) \((1 : 1 : 1)\) \((-1 : -5 : 1)\)
\((-1 : 5 : 1)\) \((-2 : -19 : 1)\) \((-2 : 19 : 1)\) \((1 : -80 : 4)\) \((1 : 80 : 4)\)

magma: [C![-2,-11,1],C![-2,8,1],C![-1,-3,1],C![-1,2,1],C![0,-1,1],C![0,0,1],C![1,-82,4],C![1,-2,1],C![1,-2,4],C![1,-1,1],C![1,0,0]]; // minimal model
 
magma: [C![-2,-19,1],C![-2,19,1],C![-1,-5,1],C![-1,5,1],C![0,-1,1],C![0,1,1],C![1,-80,4],C![1,-1,1],C![1,80,4],C![1,1,1],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: \(\Z \oplus \Z\)

magma: MordellWeilGroupGenus2(Jacobian(C));
 

Generator $D_0$ Height Order
\((-1 : -3 : 1) - (1 : 0 : 0)\) \(x + z\) \(=\) \(0,\) \(y\) \(=\) \(-3z^3\) \(0.360535\) \(\infty\)
\((-1 : -3 : 1) + (1 : -1 : 1) - 2 \cdot(1 : 0 : 0)\) \((x - z) (x + z)\) \(=\) \(0,\) \(y\) \(=\) \(xz^2 - 2z^3\) \(0.044646\) \(\infty\)
Generator $D_0$ Height Order
\((-1 : -3 : 1) - (1 : 0 : 0)\) \(x + z\) \(=\) \(0,\) \(y\) \(=\) \(-3z^3\) \(0.360535\) \(\infty\)
\((-1 : -3 : 1) + (1 : -1 : 1) - 2 \cdot(1 : 0 : 0)\) \((x - z) (x + z)\) \(=\) \(0,\) \(y\) \(=\) \(xz^2 - 2z^3\) \(0.044646\) \(\infty\)
Generator $D_0$ Height Order
\((-1 : -5 : 1) - (1 : 0 : 0)\) \(x + z\) \(=\) \(0,\) \(y\) \(=\) \(x^2z + xz^2 - 5z^3\) \(0.360535\) \(\infty\)
\((-1 : -5 : 1) + (1 : 1 : 1) - 2 \cdot(1 : 0 : 0)\) \((x - z) (x + z)\) \(=\) \(0,\) \(y\) \(=\) \(x^2z + 3xz^2 - 3z^3\) \(0.044646\) \(\infty\)

2-torsion field: 5.1.34864.1

BSD invariants

Hasse-Weil conjecture: unverified
Analytic rank: \(2\)
Mordell-Weil rank: \(2\)
2-Selmer rank:\(2\)
Regulator: \( 0.016051 \)
Real period: \( 13.69015 \)
Tamagawa product: \( 2 \)
Torsion order:\( 1 \)
Leading coefficient: \( 0.439485 \)
Analytic order of Ш: \( 1 \)   (rounded)
Order of Ш:square

Local invariants

Prime ord(\(N\)) ord(\(\Delta\)) Tamagawa L-factor Cluster picture
\(5\) \(1\) \(2\) \(2\) \(( 1 + T )( 1 + T + 5 T^{2} )\)
\(2179\) \(1\) \(1\) \(1\) \(( 1 + T )( 1 - 7 T + 2179 T^{2} )\)

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);