Properties

 Label 672.a.172032.1 Conductor $672$ Discriminant $172032$ Mordell-Weil group $$\Z/{4}\Z$$ Sato-Tate group $\mathrm{SU}(2)\times\mathrm{SU}(2)$ $$\End(J_{\overline{\Q}}) \otimes \R$$ $$\R \times \R$$ $$\End(J_{\overline{\Q}}) \otimes \Q$$ $$\Q \times \Q$$ $$\End(J) \otimes \Q$$ $$\Q \times \Q$$ $$\overline{\Q}$$-simple no $$\mathrm{GL}_2$$-type yes

Related objects

Show commands for: SageMath / Magma

Simplified equation

 $y^2 + (x^3 + x)y = -x^6 - 16x^4 - 75x^2 + 56$ (homogenize, simplify) $y^2 + (x^3 + xz^2)y = -x^6 - 16x^4z^2 - 75x^2z^4 + 56z^6$ (dehomogenize, simplify) $y^2 = -3x^6 - 62x^4 - 299x^2 + 224$ (minimize, homogenize)

sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([56, 0, -75, 0, -16, 0, -1]), R([0, 1, 0, 1]));

magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![56, 0, -75, 0, -16, 0, -1], R![0, 1, 0, 1]);

sage: X = HyperellipticCurve(R([224, 0, -299, 0, -62, 0, -3]))

magma: X,pi:= SimplifiedModel(C);

Invariants

 Conductor: $$N$$ $$=$$ $$672$$ $$=$$ $$2^{5} \cdot 3 \cdot 7$$ magma: Conductor(LSeries(C: ExcFactors:=[*<2,Valuation(672,2),R![1, 1]>*])); Factorization($1); Discriminant: $$\Delta$$ $$=$$ $$172032$$ $$=$$ $$2^{13} \cdot 3 \cdot 7$$ magma: Discriminant(C); Factorization(Integers()!$1);

G2 invariants

 $$I_2$$ $$=$$ $$16916$$ $$=$$ $$2^{2} \cdot 4229$$ $$I_4$$ $$=$$ $$151117825$$ $$=$$ $$5^{2} \cdot 6044713$$ $$I_6$$ $$=$$ $$232872423961$$ $$=$$ $$397 \cdot 586580413$$ $$I_{10}$$ $$=$$ $$-21504$$ $$=$$ $$- 2^{10} \cdot 3 \cdot 7$$ $$J_2$$ $$=$$ $$16916$$ $$=$$ $$2^{2} \cdot 4229$$ $$J_4$$ $$=$$ $$-88822256$$ $$=$$ $$- 2^{4} \cdot 103 \cdot 53897$$ $$J_6$$ $$=$$ $$277597802496$$ $$=$$ $$2^{12} \cdot 3 \cdot 7 \cdot 3227281$$ $$J_8$$ $$=$$ $$-798387183476800$$ $$=$$ $$- 2^{6} \cdot 5^{2} \cdot 107 \cdot 991 \cdot 4705829$$ $$J_{10}$$ $$=$$ $$-172032$$ $$=$$ $$- 2^{13} \cdot 3 \cdot 7$$ $$g_1$$ $$=$$ $$-1352659309173012149/168$$ $$g_2$$ $$=$$ $$419870026410625699/168$$ $$g_3$$ $$=$$ $$-461744933079368$$

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); $$\mathrm{Aut}(X_{\overline{\Q}})$$ $$\simeq$$$C_2^2$magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);

Rational points

 This curve has no rational points. This curve has no rational points. This curve has no rational points.

magma: []; // minimal model

magma: []; // simplified model

Number of rational Weierstrass points: $$0$$

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

This curve is locally solvable except over $\Q_{2}$.

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: $$\Z/{4}\Z$$

magma: MordellWeilGroupGenus2(Jacobian(C));

Generator $D_0$ Height Order
$$D_0 - D_\infty$$ $$x^2 + 11z^2$$ $$=$$ $$0,$$ $$y$$ $$=$$ $$5xz^2 + z^3$$ $$0$$ $$4$$
Generator $D_0$ Height Order
$$D_0 - D_\infty$$ $$x^2 + 11z^2$$ $$=$$ $$0,$$ $$y$$ $$=$$ $$5xz^2 + z^3$$ $$0$$ $$4$$
Generator $D_0$ Height Order
$$D_0 - D_\infty$$ $$x^2 + 11z^2$$ $$=$$ $$0,$$ $$y$$ $$=$$ $$x^3 + 11xz^2 + 2z^3$$ $$0$$ $$4$$

BSD invariants

 Hasse-Weil conjecture: verified Analytic rank: $$0$$ Mordell-Weil rank: $$0$$ 2-Selmer rank: $$2$$ Regulator: $$1$$ Real period: $$1.113349$$ Tamagawa product: $$2$$ Torsion order: $$4$$ Leading coefficient: $$0.278337$$ Analytic order of Ш: $$2$$   (rounded) Order of Ш: twice a square

Local invariants

Prime ord($$N$$) ord($$\Delta$$) Tamagawa L-factor Cluster picture
$$2$$ $$5$$ $$13$$ $$2$$ $$1 + T$$
$$3$$ $$1$$ $$1$$ $$1$$ $$( 1 - T )( 1 + 2 T + 3 T^{2} )$$
$$7$$ $$1$$ $$1$$ $$1$$ $$( 1 - T )( 1 + 7 T^{2} )$$

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 curves:
Elliptic curve 48.a1
Elliptic curve 14.a1

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 $$\Q$$.