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

• Label: 2.23.d_bi
• 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:	$1 + 3 x + 34 x^{2} + 69 x^{3} + 529 x^{4}$
Frobenius angles:	$\pm0.423778023823$, $\pm0.685352527688$
Angle rank:	$2$ (numerical)
Number field:	4.0.4525857.2
Galois group:	$D_{4}$
Jacobians:	$32$
Isomorphism classes:	32
Cyclic group of points:	no
Non-cyclic primes:	$2$

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$636$	$312912$	$147152592$	$78344403264$	$41403560180676$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$27$	$589$	$12096$	$279961$	$6432777$	$148016302$	$3405035367$	$78311204689$	$1801148104512$	$41426513302309$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 32 curves (of which all are hyperelliptic):

• $y^2=8 x^6+8 x^5+9 x^4+8 x^3+x^2+15 x+17$
• $y^2=16 x^6+3 x^5+7 x^4+7 x^3+15 x^2+7 x+6$
• $y^2=11 x^6+14 x^5+3 x^4+7 x^3+2 x^2+15 x+5$
• $y^2=5 x^5+10 x^4+9 x^3+9 x^2+11 x+4$
• $y^2=18 x^6+17 x^5+7 x^4+12 x^3+17 x^2+13 x+4$
• $y^2=18 x^6+2 x^5+7 x^4+19 x^3+21 x^2+13 x+21$
• $y^2=12 x^6+4 x^5+3 x^4+15 x^3+x^2+12 x+19$
• $y^2=7 x^6+8 x^5+6 x^4+7 x^3+x^2+8 x+13$
• $y^2=7 x^6+11 x^5+11 x^4+11 x^3+7 x^2+11 x+1$
• $y^2=x^6+17 x^5+14 x^4+9 x^3+9 x^2+22 x+16$
• $y^2=9 x^6+17 x^5+7 x^4+15 x^3+8 x^2+4 x+16$
• $y^2=5 x^6+22 x^5+10 x^4+18 x^3+11 x^2+17 x+4$
• $y^2=11 x^6+11 x^5+3 x^3+7 x^2+20 x+7$
• $y^2=6 x^6+16 x^5+10 x^4+5 x^3+11 x^2+15 x+15$
• $y^2=3 x^6+18 x^5+21 x^4+22 x^3+8 x^2+22 x+3$
• $y^2=4 x^6+16 x^5+14 x^4+13 x^3+16 x^2+16 x+12$
• $y^2=9 x^5+2 x^4+12 x^3+9 x^2+12 x+18$
• $y^2=6 x^6+4 x^5+3 x^4+21 x^3+6 x^2+7 x+6$
• $y^2=9 x^6+2 x^5+15 x^4+18 x^3+x^2+14 x+16$
• $y^2=12 x^6+19 x^5+21 x^4+19 x^2+4 x+21$
• and

• $y^2=7 x^6+16 x^5+8 x^3+18 x^2+18 x+2$
• $y^2=3 x^6+18 x^5+12 x^4+17 x^3+4 x^2+10 x+15$
• $y^2=6 x^6+13 x^5+4 x^4+8 x^3+17 x^2+19 x$
• $y^2=13 x^6+16 x^5+18 x^3+4 x^2+13 x+7$
• $y^2=13 x^6+9 x^5+20 x^4+13 x^3+10 x+13$
• $y^2=9 x^5+17 x^4+14 x^3+3 x^2+13 x+2$
• $y^2=22 x^6+16 x^5+4 x^4+18 x^3+9 x^2+18 x+1$
• $y^2=18 x^6+12 x^5+4 x^4+3 x^3+x^2+4 x+7$
• $y^2=6 x^6+18 x^5+3 x^4+15 x^3+3 x^2+7 x+5$
• $y^2=7 x^6+14 x^5+13 x^4+8 x^3+18 x^2+16 x+2$
• $y^2=4 x^6+3 x^5+21 x^4+15 x^3+8 x^2+21 x+5$
• $y^2=21 x^5+8 x^4+3 x^3+14 x^2+11 x+22$

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 4.0.4525857.2.

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.ad_bi	$2$	(not in LMFDB)