Abelian variety isogeny class 1.97.j over $\F_{97}$

• Label: 1.97.j
• Base field: $\F_{97}$
• 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:	$\F_{97}$
Dimension:	$1$
L-polynomial:	$1 + 9 x + 97 x^{2}$
Frobenius angles:	$\pm0.651042346102$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-307}) \)
Galois group:	$C_2$
Jacobians:	$3$
Isomorphism classes:	3
Cyclic group of points:	yes

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$107$	$9523$	$910784$	$88535331$	$8587469147$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$107$	$9523$	$910784$	$88535331$	$8587469147$	$832970258176$	$80798287696667$	$7837433734845123$	$760231057078152128$	$73742412690055132243$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 3 curves (of which 0 are hyperelliptic):

• $y^2=x^3+72 x+72$
• $y^2=x^3+78 x+78$
• $y^2=x^3+44 x+26$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{97}$.

Endomorphism algebra over $\F_{97}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-307}) \).

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
1.97.aj	$2$	(not in LMFDB)