Abelian variety isogeny class 1.163.ak over $\F_{163}$

• Label: 1.163.ak
• Base field: $\F_{163}$
• Dimension: $1$
• $p$-rank: $1$
• Ordinary: yes
• Supersingular: no
• Simple: yes
• Geometrically simple: yes
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: yes

Invariants

Base field:	$\F_{163}$
Dimension:	$1$
L-polynomial:	$1 - 10 x + 163 x^{2}$
Frobenius angles:	$\pm0.371911250799$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-138}) \)
Galois group:	$C_2$
Jacobians:	$8$

This isogeny class is simple and geometrically simple, primitive, ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.

Newton polygon

This isogeny class is ordinary.

$p$-rank:	$1$
Slopes:	$[0, 1]$

Point counts

Point counts of the abelian variety

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$154$	$26796$	$4334638$	$705913824$	$115063003594$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$154$	$26796$	$4334638$	$705913824$	$115063003594$	$18755363107404$	$3057125276501758$	$498311415725692800$	$81224760542177794234$	$13239635966871966395436$

Jacobians and polarizations

This isogeny class contains the Jacobians of 8 curves (of which all are hyperelliptic), and hence is principally polarizable:

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{163}$.

Endomorphism algebra over $\F_{163}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-138}) \).

Base change

This is a primitive isogeny class.

Twists

Below is a list of all twists of this isogeny class.

Twist	Extension degree	Common base change
1.163.k	$2$	(not in LMFDB)