Abelian variety isogeny class 2.37.ab_ck over $\F_{37}$

• Label: 2.37.ab_ck
• Base field: $\F_{37}$
• Dimension: $2$
• $p$-rank: $2$
• Ordinary: yes
• Supersingular: no
• Simple: no
• Geometrically simple: no
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: yes

Invariants

Base field:	$\F_{37}$
Dimension:	$2$
L-polynomial:	$( 1 - 4 x + 37 x^{2} )( 1 + 3 x + 37 x^{2} )$
	$1 - x + 62 x^{2} - 37 x^{3} + 1369 x^{4}$
Frobenius angles:	$\pm0.393356479550$, $\pm0.579312881556$
Angle rank:	$2$ (numerical)
Jacobians:	$36$
Cyclic group of points:	yes

This isogeny class is not 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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$1394$	$2049180$	$2569459832$	$3508524028800$	$4808530092044954$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$37$	$1493$	$50728$	$1872049$	$69343177$	$2565690986$	$94931710645$	$3512484347521$	$129961754769496$	$4808584126324493$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 36 curves (of which all are hyperelliptic):

• $y^2=18 x^6+18 x^5+21 x^4+5 x^3+x^2+30 x+31$
• $y^2=19 x^6+19 x^5+21 x^4+21 x^3+13 x^2+15 x+22$
• $y^2=7 x^6+8 x^5+22 x^4+2 x^3+3 x^2+23 x+11$
• $y^2=23 x^6+27 x^5+2 x^4+20 x^3+15 x^2+22 x+21$
• $y^2=13 x^6+10 x^5+21 x^4+12 x^3+11 x^2+31 x+27$
• $y^2=25 x^6+20 x^5+32 x^4+9 x^2+22 x+2$
• $y^2=28 x^6+6 x^5+3 x^4+14 x^3+3 x^2+x+1$
• $y^2=30 x^6+13 x^5+23 x^4+9 x^3+14 x^2+5 x+13$
• $y^2=36 x^6+9 x^4+22 x^3+3 x^2+23 x+21$
• $y^2=3 x^6+2 x^5+36 x^4+30 x^3+22 x^2+10 x+30$
• $y^2=22 x^6+25 x^5+20 x^4+28 x^3+29 x^2+31 x+12$
• $y^2=22 x^6+6 x^5+5 x^4+23 x^3+16 x^2+6 x+21$
• $y^2=30 x^6+22 x^5+36 x^3+12 x^2+20 x+5$
• $y^2=28 x^6+27 x^5+25 x^4+35 x^3+20 x^2+x+29$
• $y^2=36 x^6+18 x^5+x^4+14 x^3+20 x^2+27 x+6$
• $y^2=8 x^6+27 x^5+13 x^4+16 x^3+35 x^2+9 x+10$
• $y^2=12 x^6+24 x^5+20 x^4+7 x^3+6 x^2+17 x+23$
• $y^2=36 x^6+34 x^5+x^4+2 x^3+15 x^2+7 x+23$
• $y^2=21 x^6+13 x^5+5 x^4+33 x^3+35 x^2+33 x+4$
• $y^2=33 x^6+16 x^5+19 x^4+11 x^3+34 x^2+5 x+24$
• and

• $y^2=34 x^6+27 x^5+26 x^4+13 x^3+5 x^2+22 x+35$
• $y^2=18 x^6+14 x^5+19 x^4+15 x^3+11 x^2+x+6$
• $y^2=35 x^6+12 x^5+29 x^4+8 x^3+14 x^2+31 x+1$
• $y^2=33 x^6+6 x^5+35 x^4+13 x^3+34 x^2+3 x+1$
• $y^2=31 x^6+13 x^5+18 x^3+7 x^2+3 x+35$
• $y^2=13 x^6+7 x^5+16 x^4+34 x^3+9 x^2+23 x+15$
• $y^2=18 x^6+8 x^5+5 x^4+25 x^3+19 x^2+14 x+21$
• $y^2=16 x^6+12 x^5+2 x^4+5 x^3+29 x^2+7 x+5$
• $y^2=28 x^6+5 x^5+30 x^4+23 x^3+16 x^2+15 x+20$
• $y^2=23 x^6+11 x^5+21 x^4+23 x^3+12 x^2+19 x+33$
• $y^2=x^6+11 x^5+8 x^4+5 x^3+16 x^2+29 x+17$
• $y^2=13 x^6+18 x^5+5 x^4+17 x^3+9 x^2+11 x+2$
• $y^2=7 x^6+34 x^5+16 x^4+29 x^3+9 x^2+35 x+5$
• $y^2=24 x^6+18 x^5+4 x^4+6 x^3+18 x^2+30 x+30$
• $y^2=7 x^6+17 x^5+25 x^4+10 x^3+34 x^2+11 x+33$
• $y^2=25 x^6+21 x^5+19 x^4+23 x^3+26 x^2+9 x+1$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{37}$.

Endomorphism algebra over $\F_{37}$

The isogeny class factors as 1.37.ae $\times$ 1.37.d and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:

• 1.37.ae : \(\Q(\sqrt{-33}) \).
• 1.37.d : \(\Q(\sqrt{-139}) \).

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
2.37.ah_di	$2$	(not in LMFDB)
2.37.b_ck	$2$	(not in LMFDB)
2.37.h_di	$2$	(not in LMFDB)