Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^3 + x)y = 3x^4 + 15x^2 + 21$ | (homogenize, simplify) |
$y^2 + (x^3 + xz^2)y = 3x^4z^2 + 15x^2z^4 + 21z^6$ | (dehomogenize, simplify) |
$y^2 = x^6 + 14x^4 + 61x^2 + 84$ | (homogenize, minimize) |
Invariants
Conductor: | \( N \) | \(=\) | \(504\) | \(=\) | \( 2^{3} \cdot 3^{2} \cdot 7 \) | magma: Conductor(LSeries(C)); Factorization($1);
|
Discriminant: | \( \Delta \) | \(=\) | \(-27216\) | \(=\) | \( - 2^{4} \cdot 3^{5} \cdot 7 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(8456\) | \(=\) | \( 2^{3} \cdot 7 \cdot 151 \) |
\( I_4 \) | \(=\) | \(9496\) | \(=\) | \( 2^{3} \cdot 1187 \) |
\( I_6 \) | \(=\) | \(26675348\) | \(=\) | \( 2^{2} \cdot 7 \cdot 952691 \) |
\( I_{10} \) | \(=\) | \(108864\) | \(=\) | \( 2^{6} \cdot 3^{5} \cdot 7 \) |
\( J_2 \) | \(=\) | \(4228\) | \(=\) | \( 2^{2} \cdot 7 \cdot 151 \) |
\( J_4 \) | \(=\) | \(743250\) | \(=\) | \( 2 \cdot 3 \cdot 5^{3} \cdot 991 \) |
\( J_6 \) | \(=\) | \(173847744\) | \(=\) | \( 2^{6} \cdot 3^{2} \cdot 7 \cdot 43117 \) |
\( J_8 \) | \(=\) | \(45651924783\) | \(=\) | \( 3^{3} \cdot 59 \cdot 191 \cdot 150041 \) |
\( J_{10} \) | \(=\) | \(27216\) | \(=\) | \( 2^{4} \cdot 3^{5} \cdot 7 \) |
\( g_1 \) | \(=\) | \(12063042849801664/243\) | ||
\( g_2 \) | \(=\) | \(167186257609000/81\) | ||
\( g_3 \) | \(=\) | \(3083035208512/27\) |
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
Number of rational Weierstrass points: \(0\)
This curve is locally solvable everywhere.
Mordell-Weil group of the Jacobian
Group structure: \(\Z/{4}\Z \oplus \Z/{4}\Z\)
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - 2 \cdot(1 : -1 : 0)\) | \(z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0\) | \(4\) |
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x^2 - xz + 4z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(3z^3\) | \(0\) | \(4\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - 2 \cdot(1 : -1 : 0)\) | \(z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0\) | \(4\) |
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x^2 - xz + 4z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(3z^3\) | \(0\) | \(4\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - 2 \cdot(1 : -1 : 0)\) | \(z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + xz^2\) | \(0\) | \(4\) |
\(D_0 - (1 : -1 : 0) - (1 : 1 : 0)\) | \(x^2 - xz + 4z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + xz^2 + 6z^3\) | \(0\) | \(4\) |
2-torsion field: 8.0.49787136.1
BSD invariants
Hasse-Weil conjecture: | verified |
Analytic rank: | \(0\) |
Mordell-Weil rank: | \(0\) |
2-Selmer rank: | \(2\) |
Regulator: | \( 1 \) |
Real period: | \( 7.782699 \) |
Tamagawa product: | \( 8 \) |
Torsion order: | \( 16 \) |
Leading coefficient: | \( 0.243209 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(3\) | \(4\) | \(2\) | \(1 + T + 2 T^{2}\) | |
\(3\) | \(2\) | \(5\) | \(4\) | \(( 1 - T )( 1 + T )\) | |
\(7\) | \(1\) | \(1\) | \(1\) | \(( 1 + T )( 1 + 7 T^{2} )\) |
Galois representations
For primes $\ell \ge 5$ the Galois representation data has not been computed for this curve since it is not generic.
For primes $\ell \le 3$, the image of the mod-$\ell$ Galois representation is listed in the table below, whenever it is not all of $\GSp(4,\F_\ell)$.
Prime \(\ell\) | mod-\(\ell\) image | Is torsion prime? |
---|---|---|
\(2\) | 2.90.6 | yes |
\(3\) | 3.90.1 | no |
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 curve isogeny classes:
Elliptic curve isogeny class 24.a
Elliptic curve isogeny class 21.a
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 \(\Q\).