Genus 2 curve 1876.a.7504.1

• Label: 1876.a.7504.1
• Conductor: $1876$
• Discriminant: $7504$
• Mordell-Weil group: \(\Z\)
• Sato-Tate group: $\mathrm{USp}(4)$
• \(\End(J_{\overline{\Q}}) \otimes \R\): \(\R\)
• \(\End(J_{\overline{\Q}}) \otimes \Q\): \(\Q\)
• \(\End(J) \otimes \Q\): \(\Q\)
• \(\overline{\Q}\)-simple: yes
• \(\mathrm{GL}_2\)-type: no

Minimal equation

$y^2 + (x^2 + 1)y = x^5 - x^4 + x^2 - x$

(, )

Invariants

Conductor:	\( N \)	\(=\)	\(1876\)	\(=\)	\( 2^{2} \cdot 7 \cdot 67 \)
Discriminant:	\( \Delta \)	\(=\)	\(7504\)	\(=\)	\( 2^{4} \cdot 7 \cdot 67 \)

Igusa-Clebsch invariants

\( I_2 \)	\(=\)	\(88\)	\(=\)	\( 2^{3} \cdot 11 \)
\( I_4 \)	\(=\)	\(592\)	\(=\)	\( 2^{4} \cdot 37 \)
\( I_6 \)	\(=\)	\(16804\)	\(=\)	\( 2^{2} \cdot 4201 \)
\( I_{10} \)	\(=\)	\(-30016\)	\(=\)	\( - 2^{6} \cdot 7 \cdot 67 \)

Automorphism group

\(\mathrm{Aut}(X)\)	\(\simeq\)	$C_2$
\(\mathrm{Aut}(X_{\overline{\Q}})\)	\(\simeq\)	$C_2$

Rational points

All points: \((1 : 0 : 0),\, (0 : 0 : 1),\, (-1 : 0 : 1),\, (0 : -1 : 1),\, (1 : 0 : 1),\, (-1 : -2 : 1),\, (1 : -2 : 1)\)

Number of rational Weierstrass points: \(1\)

This curve is locally solvable everywhere.

Mordell-Weil group of the Jacobian

Group structure: \(\Z\)

Generator	$D_0$						Height	Order
\((0 : -1 : 1) + (1 : -2 : 1) - 2 \cdot(1 : 0 : 0)\)	\(x (x - z)\)	\(=\)	\(0,\)	\(y\)	\(=\)	\(-xz^2 - z^3\)	\(0.005297\)	\(\infty\)

2-torsion field: 5.1.30016.1

BSD invariants

Hasse-Weil conjecture:	unverified
Analytic rank:	\(1\)
Mordell-Weil rank:	\(1\)
2-Selmer rank:	\(1\)
Regulator:	\( 0.005297 \)
Real period:	\( 19.00495 \)
Tamagawa product:	\( 3 \)
Torsion order:	\( 1 \)
Leading coefficient:	\( 0.302059 \)
Analytic order of Ш:	\( 1 \)   (rounded)
Order of Ш:	square

Local invariants

Prime	ord(\(N\))	ord(\(\Delta\))	Tamagawa	L-factor	Cluster picture
\(2\)	\(2\)	\(4\)	\(3\)	\(1 + T + 2 T^{2}\)
\(7\)	\(1\)	\(1\)	\(1\)	\(( 1 + T )( 1 + 3 T + 7 T^{2} )\)
\(67\)	\(1\)	\(1\)	\(1\)	\(( 1 + T )( 1 - 6 T + 67 T^{2} )\)

Galois representations

The mod-$\ell$ Galois representation has maximal image \(\GSp(4,\F_\ell)\) for all primes \( \ell \) except those listed.

Prime \(\ell\)	mod-\(\ell\) image	Is torsion prime?
\(2\)	2.6.1	no

Sato-Tate group

\(\mathrm{ST}\)	\(\simeq\)	$\mathrm{USp}(4)$
\(\mathrm{ST}^0\)	\(\simeq\)	\(\mathrm{USp}(4)\)

Decomposition of the Jacobian

Simple over \(\overline{\Q}\)

Endomorphisms of the Jacobian

Not of \(\GL_2\)-type over \(\Q\)

Endomorphism ring over \(\Q\):

\(\End (J_{})\)	\(\simeq\)	\(\Z\)
\(\End (J_{}) \otimes \Q \)	\(\simeq\)	\(\Q\)
\(\End (J_{}) \otimes \R\)	\(\simeq\)	\(\R\)

All \(\overline{\Q}\)-endomorphisms of the Jacobian are defined over \(\Q\).