Genus 2 isogeny class 128812.b

• Label: 128812.b
• Conductor: $128812$
• 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

Genus 2 curves in isogeny class 128812.b

Label	Equation
128812.b.515248.1	\(y^2 + (x^2 + 1)y = x^5 - x^4 - 2x^3 + x^2 - 3x + 4\)

L-function data

Analytic rank:

\(1\)

Mordell-Weil rank:

\(1\)

Bad L-factors:

Prime	L-Factor
\(2\)	\( 1 + T + 2 T^{2}\)
\(32203\)	\( ( 1 + T )( 1 + 215 T + 32203 T^{2} )\)

Good L-factors:

Prime	L-Factor
\(3\)	\( 1 + 9 T^{4}\)
\(5\)	\( 1 - T + 6 T^{2} - 5 T^{3} + 25 T^{4}\)
\(7\)	\( 1 + 3 T + 15 T^{2} + 21 T^{3} + 49 T^{4}\)
\(11\)	\( ( 1 - 3 T + 11 T^{2} )( 1 + 11 T^{2} )\)
\(13\)	\( 1 - 4 T + 12 T^{2} - 52 T^{3} + 169 T^{4}\)
\(17\)	\( 1 + 8 T + 40 T^{2} + 136 T^{3} + 289 T^{4}\)
\(19\)	\( ( 1 - 4 T + 19 T^{2} )( 1 + 6 T + 19 T^{2} )\)
\(23\)	\( 1 - 8 T^{2} + 529 T^{4}\)
\(29\)	\( 1 - 7 T + 49 T^{2} - 203 T^{3} + 841 T^{4}\)
$\cdots$	$\cdots$

See L-function page for more information

Sato-Tate group

\(\mathrm{ST} =\) $\mathrm{USp}(4)$

Decomposition of the Jacobian

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

Endomorphisms of the Jacobian

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

Endomorphism algebra over \(\Q\):

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

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

More complete information on endomorphism algebras and rings can be found on the pages of the individual curves in the isogeny class.