Abelian variety isogeny class 2.27.an_dr over $\F_{3^{3}}$

• Label: 2.27.an_dr
• Base field: $\F_{3^{3}}$
• 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:	$\F_{3^{3}}$
Dimension:	$2$
L-polynomial:	$1 - 13 x + 95 x^{2} - 351 x^{3} + 729 x^{4}$
Frobenius angles:	$\pm0.238098144017$, $\pm0.326721400400$
Angle rank:	$2$ (numerical)
Number field:	4.0.98725.1
Galois group:	$D_{4}$
Jacobians:	$6$
Isomorphism classes:	6

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$461$	$548129$	$396465071$	$283639765501$	$205936656203536$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$15$	$751$	$20139$	$533715$	$14352080$	$387390187$	$10460124053$	$282428892659$	$7625597935893$	$205891140778486$

Jacobians and polarizations

This isogeny class contains the Jacobians of 6 curves (of which all are hyperelliptic), and hence is principally polarizable:

• $y^2=(2a^2+1)x^6+(2a^2+2)x^5+2x^4+ax^3+(2a^2+2a)x^2+(2a+1)x+a^2+2a+2$
• $y^2=(2a+1)x^6+2a^2x^5+(a+2)x^4+(2a^2+a+2)x^3+(a^2+a)x^2+(2a+2)x+a^2+2a+2$
• $y^2=(a^2+a)x^6+(2a^2+2)x^5+(a+2)x^4+(a^2+a)x^3+(a^2+1)x^2+(a^2+2a)x+2a^2+2a$
• $y^2=2ax^6+(2a^2+a+2)x^5+ax^4+(2a^2+2a+2)x^3+(a^2+2)x^2+(2a+1)x+a^2+a+2$
• $y^2=(a^2+a+2)x^6+(2a^2+2a+1)x^5+(2a^2+a+2)x^4+(a^2+a+2)x^3+(2a+2)x^2+(a^2+2a+2)x+2a^2$
• $y^2=(2a^2+a+1)x^6+(2a+1)x^5+(a^2+2a+1)x^4+(a^2+a+1)x^3+2a^2x^2+2a^2x+2a+2$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{3^{3}}$.

Endomorphism algebra over $\F_{3^{3}}$

The endomorphism algebra of this simple isogeny class is 4.0.98725.1.

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
2.27.n_dr	$2$	2.729.v_caf