Abelian variety isogeny class 2.23.aj_ck over $\F_{23}$

• Label: 2.23.aj_ck
• Base field: $\F_{23}$
• Dimension: $2$
• $p$-rank: $2$
• Ordinary: yes
• Supersingular: no
• Simple: yes
• Geometrically simple: yes
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: yes

Invariants

Base field:	$\F_{23}$
Dimension:	$2$
L-polynomial:	$1 - 9 x + 62 x^{2} - 207 x^{3} + 529 x^{4}$
Frobenius angles:	$\pm0.260199902379$, $\pm0.418179396156$
Angle rank:	$2$ (numerical)
Number field:	4.0.3757.1
Galois group:	$D_{4}$
Jacobians:	$18$

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:	$2$
Slopes:	$[0, 0, 1, 1]$

Point counts

Point counts of the abelian variety

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$376$	$303808$	$152028832$	$78451732224$	$41414287011976$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$15$	$573$	$12492$	$280345$	$6434445$	$148031934$	$3404840307$	$78310705105$	$1801149404292$	$41426504438613$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 18 curves (of which all are hyperelliptic):

• $y^2=6 x^6+2 x^5+13 x^4+15 x^3+15 x^2+2 x+15$
• $y^2=11 x^5+7 x^4+8 x^3+15 x^2+16 x+10$
• $y^2=4 x^6+4 x^5+10 x^4+12 x^3+17 x^2+14 x+22$
• $y^2=17 x^6+21 x^5+8 x^4+5 x^3+17 x^2+4 x+12$
• $y^2=19 x^6+8 x^5+14 x^4+10 x^3+2 x^2+4 x+10$
• $y^2=2 x^6+9 x^5+15 x^4+10 x^2+6 x+22$
• $y^2=4 x^6+21 x^5+2 x^4+22 x^3+6 x^2+13 x+15$
• $y^2=7 x^6+11 x^5+6 x^4+15 x^3+5 x^2+12 x+20$
• $y^2=18 x^6+18 x^5+19 x^4+15 x^3+18 x^2+18 x+14$
• $y^2=22 x^6+9 x^5+12 x^4+21 x^3+5 x^2+22 x$
• $y^2=x^6+19 x^5+4 x^4+4 x^3+19 x^2+13 x+20$
• $y^2=22 x^6+15 x^5+14 x^4+19 x^3+11 x+11$
• $y^2=11 x^5+22 x^4+13 x^3+6 x^2+4 x+7$
• $y^2=21 x^6+6 x^5+12 x^4+16 x^3+22 x^2+10 x+21$
• $y^2=14 x^6+11 x^5+5 x^4+4 x^3+x^2+8 x$
• $y^2=21 x^6+22 x^5+10 x^4+3 x^3+10 x^2+11 x+11$
• $y^2=12 x^6+6 x^5+12 x^4+6 x^3+4 x+22$
• $y^2=x^6+14 x^5+14 x^4+16 x^3+11 x^2+15 x+15$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{23}$.

Endomorphism algebra over $\F_{23}$

The endomorphism algebra of this simple isogeny class is 4.0.3757.1.

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
2.23.j_ck	$2$	(not in LMFDB)