Abelian variety isogeny class 3.16.ar_fd_ayy over $\F_{2^{4}}$

• Label: 3.16.ar_fd_ayy
• Base field: $\F_{2^{4}}$
• Dimension: $3$
• $p$-rank: $2$
• Ordinary: no
• Supersingular: no
• Simple: no
• Geometrically simple: no
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: no

Invariants

Base field:	$\F_{2^{4}}$
Dimension:	$3$
L-polynomial:	$( 1 - 4 x )^{2}( 1 - 9 x + 45 x^{2} - 144 x^{3} + 256 x^{4} )$
	$1 - 17 x + 133 x^{2} - 648 x^{3} + 2128 x^{4} - 4352 x^{5} + 4096 x^{6}$
Frobenius angles:	$0$, $0$, $\pm0.144241903460$, $\pm0.427458851042$
Angle rank:	$2$ (numerical)

This isogeny class is not simple, primitive, not ordinary, and not supersingular. It is principally polarizable.

Newton polygon

$p$-rank:	$2$
Slopes:	$[0, 0, 1/2, 1/2, 1, 1]$

Point counts

Point counts of the abelian variety

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$1341$	$15253875$	$67490765244$	$278472316633875$	$1150067991621172041$

Point counts of the (virtual) curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$0$	$234$	$4023$	$64834$	$1045980$	$16778151$	$268468200$	$4294984994$	$68718798063$	$1099508543874$

Jacobians and polarizations

This isogeny class is principally polarizable, but does not contain a Jacobian.

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{2^{4}}$.

Endomorphism algebra over $\F_{2^{4}}$

The isogeny class factors as 1.16.ai $\times$ 2.16.aj_bt and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:

• 1.16.ai : the quaternion algebra over \(\Q\) ramified at $2$ and $\infty$.
• 2.16.aj_bt : 4.0.626545.2.

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

Twist	Extension degree	Common base change
3.16.ab_al_cu	$2$	(not in LMFDB)
3.16.b_al_acu	$2$	(not in LMFDB)
3.16.r_fd_yy	$2$	(not in LMFDB)
3.16.af_z_aee	$3$	(not in LMFDB)