Properties

Label 5476.b.21904.1
Conductor 5476
Discriminant -21904
Sato-Tate group $G_{3,3}$
\(\End(J_{\overline{\Q}}) \otimes \R\) \(\R \times \R\)
\(\End(J_{\overline{\Q}}) \otimes \Q\) \(\Q \times \Q\)
\(\overline{\Q}\)-simple no
\(\mathrm{GL}_2\)-type yes

Related objects

Learn more about

Show commands for: Magma / SageMath

Minimal equation

magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, 0, -1, 0, 0, 0, 1], R![1]);
 
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, 0, -1, 0, 0, 0, 1]), R([1]))
 

$y^2 + y = x^6 - x^2$

Invariants

magma: Conductor(LSeries(C)); Factorization($1);
 
\( N \)  =  \( 5476 \)  =  \( 2^{2} \cdot 37^{2} \)
magma: Discriminant(C); Factorization(Integers()!$1);
 
\( \Delta \)  =  \(-21904\)  =  \( -1 \cdot 2^{4} \cdot 37^{2} \)

Igusa-Clebsch invariants

magma: IgusaClebschInvariants(C); [Factorization(Integers()!a): a in $1];
 
sage: C.igusa_clebsch_invariants(); [factor(a) for a in _]
 

Igusa invariants

magma: IgusaInvariants(C); [Factorization(Integers()!a): a in $1];
 

G2 invariants

magma: G2Invariants(C);
 

\( I_2 \)  =  \(-960\)  =  \( -1 \cdot 2^{6} \cdot 3 \cdot 5 \)
\( I_4 \)  =  \(13632\)  =  \( 2^{6} \cdot 3 \cdot 71 \)
\( I_6 \)  =  \(-7574016\)  =  \( -1 \cdot 2^{9} \cdot 3 \cdot 4931 \)
\( I_{10} \)  =  \(-89718784\)  =  \( -1 \cdot 2^{16} \cdot 37^{2} \)
\( J_2 \)  =  \(-120\)  =  \( -1 \cdot 2^{3} \cdot 3 \cdot 5 \)
\( J_4 \)  =  \(458\)  =  \( 2 \cdot 229 \)
\( J_6 \)  =  \(4416\)  =  \( 2^{6} \cdot 3 \cdot 23 \)
\( J_8 \)  =  \(-184921\)  =  \( -1 \cdot 11 \cdot 16811 \)
\( J_{10} \)  =  \(-21904\)  =  \( -1 \cdot 2^{4} \cdot 37^{2} \)
\( g_1 \)  =  \(1555200000/1369\)
\( g_2 \)  =  \(49464000/1369\)
\( g_3 \)  =  \(-3974400/1369\)
Alternative geometric invariants: Igusa-Clebsch, Igusa, G2

Automorphism group

magma: AutomorphismGroup(C); IdentifyGroup($1);
 
\(\mathrm{Aut}(X)\)\(\simeq\) \(V_4 \) (GAP id : [4,2])
magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
 
\(\mathrm{Aut}(X_{\overline{\Q}})\)\(\simeq\) \(V_4 \) (GAP id : [4,2])

Rational points

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);
 

This curve is locally solvable everywhere.

magma: [C![-1,-5,2],C![-1,-3,2],C![-1,-1,1],C![-1,0,1],C![0,-1,1],C![0,0,1],C![1,-5,2],C![1,-3,2],C![1,-1,0],C![1,-1,1],C![1,0,1],C![1,1,0]];
 

Known rational points: (-1 : -5 : 2), (-1 : -3 : 2), (-1 : -1 : 1), (-1 : 0 : 1), (0 : -1 : 1), (0 : 0 : 1), (1 : -5 : 2), (1 : -3 : 2), (1 : -1 : 0), (1 : -1 : 1), (1 : 0 : 1), (1 : 1 : 0)

magma: #Roots(HyperellipticPolynomials(SimplifiedModel(C)));
 

Number of rational Weierstrass points: \(0\)

Invariants of the Jacobian:

Analytic rank*: \(2\)

magma: TwoSelmerGroup(Jacobian(C)); NumberOfGenerators($1);
 

2-Selmer rank: \(2\)

magma: HasSquareSha(Jacobian(C));
 

Order of Ш*: square

Regulator: 0.00491902220991

Real period: 20.265680057466441026323059448

Tamagawa numbers: 3 (p = 2), 1 (p = 37)

magma: TorsionSubgroup(Jacobian(SimplifiedModel(C))); AbelianInvariants($1);
 

Torsion: \(\mathrm{trivial}\)

2-torsion field: 6.4.350464.1

Sato-Tate group

\(\mathrm{ST}\)\(\simeq\) $G_{3,3}$
\(\mathrm{ST}^0\)\(\simeq\) \(\mathrm{SU}(2)\times\mathrm{SU}(2)\)

Decomposition

Splits over \(\Q\)

Decomposes up to isogeny as the product of the non-isogenous elliptic curves:
  Elliptic curve 148.a1
  Elliptic curve 37.a1

Endomorphisms

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 \(\Q\).