Genus 2 curve 576.a.576.1

• Label: 576.a.576.1
• Conductor: $576$
• Discriminant: $-576$
• Mordell-Weil group: \(\Z/{10}\Z\)
• Sato-Tate group: $E_2$
• \(\End(J_{\overline{\Q}}) \otimes \R\): \(\mathrm{M}_2(\R)\)
• \(\End(J_{\overline{\Q}}) \otimes \Q\): \(\mathrm{M}_2(\Q)\)
• \(\End(J) \otimes \Q\): \(\mathsf{CM}\)
• \(\overline{\Q}\)-simple: no
• \(\mathrm{GL}_2\)-type: yes

Minimal equation

$y^2 + (x^3 + x^2 + x + 1)y = -x^3 - x$

(, )

Invariants

Conductor:	\( N \)	\(=\)	\(576\)	\(=\)	\( 2^{6} \cdot 3^{2} \)
Discriminant:	\( \Delta \)	\(=\)	\(-576\)	\(=\)	\( - 2^{6} \cdot 3^{2} \)

Igusa-Clebsch invariants

\( I_2 \)	\(=\)	\(68\)	\(=\)	\( 2^{2} \cdot 17 \)
\( I_4 \)	\(=\)	\(124\)	\(=\)	\( 2^{2} \cdot 31 \)
\( I_6 \)	\(=\)	\(2616\)	\(=\)	\( 2^{3} \cdot 3 \cdot 109 \)
\( I_{10} \)	\(=\)	\(72\)	\(=\)	\( 2^{3} \cdot 3^{2} \)

Automorphism group

\(\mathrm{Aut}(X)\)	\(\simeq\)	$C_4$
\(\mathrm{Aut}(X_{\overline{\Q}})\)	\(\simeq\)	$D_4$

Rational points

All points: \((1 : 0 : 0),\, (1 : -1 : 0),\, (0 : 0 : 1),\, (0 : -1 : 1)\)

Number of rational Weierstrass points: \(0\)

This curve is locally solvable everywhere.

Mordell-Weil group of the Jacobian

Group structure: \(\Z/{10}\Z\)

Generator	$D_0$						Height	Order
\((0 : -1 : 1) - (1 : 0 : 0)\)	\(z x\)	\(=\)	\(0,\)	\(y\)	\(=\)	\(-x^3 - z^3\)	\(0\)	\(10\)

2-torsion field: \(\Q(\zeta_{12})\)

BSD invariants

Hasse-Weil conjecture:	verified
Analytic rank:	\(0\)
Mordell-Weil rank:	\(0\)
2-Selmer rank:	\(1\)
Regulator:	\( 1 \)
Real period:	\( 22.39625 \)
Tamagawa product:	\( 1 \)
Torsion order:	\( 10 \)
Leading coefficient:	\( 0.223962 \)
Analytic order of Ш:	\( 1 \)   (rounded)
Order of Ш:	square

Local invariants

Prime	ord(\(N\))	ord(\(\Delta\))	Tamagawa	L-factor	Cluster picture
\(2\)	\(6\)	\(6\)	\(1\)	\(1 + 2 T + 2 T^{2}\)
\(3\)	\(2\)	\(2\)	\(1\)	\(1 + T^{2}\)

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?
\(2\)	2.180.4	yes
\(3\)	3.1080.16	no

Sato-Tate group

\(\mathrm{ST}\)	\(\simeq\)	$E_2$
\(\mathrm{ST}^0\)	\(\simeq\)	\(\mathrm{SU}(2)\)

Decomposition of the Jacobian

Splits over the number field \(\Q (b) \simeq \) \(\Q(\sqrt{2}) \) with defining polynomial:
  \(x^{2} - 2\)

Decomposes up to isogeny as the square of the elliptic curve isogeny class:
  Elliptic curve isogeny class 2.2.8.1-9.1-a

Endomorphisms of the Jacobian

Of \(\GL_2\)-type over \(\Q\)

Endomorphism ring over \(\Q\):

\(\End (J_{})\)	\(\simeq\)	\(\Z [\sqrt{-1}]\)
\(\End (J_{}) \otimes \Q \)	\(\simeq\)	\(\Q(\sqrt{-1}) \)
\(\End (J_{}) \otimes \R\)	\(\simeq\)	\(\C\)

Smallest field over which all endomorphisms are defined:
Galois number field \(K = \Q (a) \simeq \) \(\Q(\sqrt{2}) \) with defining polynomial \(x^{2} - 2\)

Not of \(\GL_2\)-type over \(\overline{\Q}\)

Endomorphism ring over \(\overline{\Q}\):

\(\End (J_{\overline{\Q}})\)	\(\simeq\)	a non-Eichler order of index \(4\) in a maximal order of \(\End (J_{\overline{\Q}}) \otimes \Q\)
\(\End (J_{\overline{\Q}}) \otimes \Q \)	\(\simeq\)	\(\mathrm{M}_2(\)\(\Q\)\()\)
\(\End (J_{\overline{\Q}}) \otimes \R\)	\(\simeq\)	\(\mathrm{M}_2 (\R)\)