Abelian variety isogeny class 1.311.ab over $\F_{311}$

• Label: 1.311.ab
• Base field: $\F_{311}$
• 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:	$\F_{311}$
Dimension:	$1$
L-polynomial:	$1 - x + 311 x^{2}$
Frobenius angles:	$\pm0.490973941593$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-1243}) \)
Galois group:	$C_2$
Jacobians:	$4$
Isomorphism classes:	4

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$311$	$97343$	$30081164$	$9354759643$	$2909389540501$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$311$	$97343$	$30081164$	$9354759643$	$2909389540501$	$904820356305200$	$281399112580364971$	$87515123929198737363$	$27217203547567214198084$	$8464550303324894695426103$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 4 curves (of which 0 are hyperelliptic):

• $y^2=x^3+223 x+223$
• $y^2=x^3+88 x+88$
• $y^2=x^3+88 x+35$
• $y^2=x^3+90 x+57$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{311}$.

Endomorphism algebra over $\F_{311}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-1243}) \).

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
1.311.b	$2$	(not in LMFDB)