Properties

Label 476.a.952.1
Conductor 476
Discriminant -952
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![54, -75, 25, 7, -5], R![1, 0, 0, 1]);
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([54, -75, 25, 7, -5]), R([1, 0, 0, 1]))

$y^2 + (x^3 + 1)y = -5x^4 + 7x^3 + 25x^2 - 75x + 54$

Invariants

magma: Conductor(LSeries(C)); Factorization($1);
\( N \)  =  \( 476 \)  =  \( 2^{2} \cdot 7 \cdot 17 \)
magma: Discriminant(C); Factorization(Integers()!$1);
\( \Delta \)  =  \(-952\)  =  \( -1 \cdot 2^{3} \cdot 7 \cdot 17 \)

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);

\( I_2 \)  =  \(-14680\)  =  \( -1 \cdot 2^{3} \cdot 5 \cdot 367 \)
\( I_4 \)  =  \(4169380\)  =  \( 2^{2} \cdot 5 \cdot 208469 \)
\( I_6 \)  =  \(-23242186840\)  =  \( -1 \cdot 2^{3} \cdot 5 \cdot 13789 \cdot 42139 \)
\( I_{10} \)  =  \(-3899392\)  =  \( -1 \cdot 2^{15} \cdot 7 \cdot 17 \)
\( J_2 \)  =  \(-1835\)  =  \( -1 \cdot 5 \cdot 367 \)
\( J_4 \)  =  \(96870\)  =  \( 2 \cdot 3 \cdot 5 \cdot 3229 \)
\( J_6 \)  =  \(3910340\)  =  \( 2^{2} \cdot 5 \cdot 7 \cdot 17 \cdot 31 \cdot 53 \)
\( J_8 \)  =  \(-4139817700\)  =  \( -1 \cdot 2^{2} \cdot 5^{2} \cdot 41398177 \)
\( J_{10} \)  =  \(-952\)  =  \( -1 \cdot 2^{3} \cdot 7 \cdot 17 \)
\( g_1 \)  =  \(20805604708146875/952\)
\( g_2 \)  =  \(299272981175625/476\)
\( g_3 \)  =  \(-27661753375/2\)
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,-1,0],C![1,0,0],C![2,-5,1],C![2,-4,1]];

All rational points: (1 : -1 : 0), (1 : 0 : 0), (2 : -5 : 1), (2 : -4 : 1)

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

Number of rational Weierstrass points: \(0\)

Invariants of the Jacobian:

Analytic rank: \(0\)

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

2-Selmer rank: \(1\)

magma: HasSquareSha(Jacobian(C));

Order of Ш*: square

Tamagawa numbers: 3 (p = 2), 1 (p = 7), 1 (p = 17)

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

Torsion: \(\Z/{3}\Z \times \Z/{6}\Z\)

2-torsion field: 4.2.7616.2

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 14.a4
  Elliptic curve 34.a3

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 \(\Q\).