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

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

Invariants

Base field:	$\F_{37}$
Dimension:	$2$
L-polynomial:	$1 + 35 x^{2} + 1369 x^{4}$
Frobenius angles:	$\pm0.328409589862$, $\pm0.671590410138$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{39}, \sqrt{-109})\)
Galois group:	$C_2^2$
Jacobians:	$40$

This isogeny class is simple but not 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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$1405$	$1974025$	$2565625540$	$3518156705625$	$4808584459438525$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$38$	$1440$	$50654$	$1877188$	$69343958$	$2565524670$	$94931877134$	$3512482372228$	$129961739795078$	$4808584546459200$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 40 curves (of which all are hyperelliptic):

• $y^2=26 x^6+28 x^5+15 x^4+29 x^3+32 x^2+33 x+15$
• $y^2=15 x^6+19 x^5+30 x^4+21 x^3+27 x^2+29 x+30$
• $y^2=22 x^6+32 x^5+32 x^4+5 x^3+2 x^2+5 x+19$
• $y^2=7 x^6+27 x^5+27 x^4+10 x^3+4 x^2+10 x+1$
• $y^2=6 x^6+18 x^5+34 x^4+25 x^3+22 x^2+9 x+22$
• $y^2=12 x^6+36 x^5+31 x^4+13 x^3+7 x^2+18 x+7$
• $y^2=2 x^6+x^5+6 x^4+10 x^3+24 x^2+28 x+24$
• $y^2=4 x^6+2 x^5+12 x^4+20 x^3+11 x^2+19 x+11$
• $y^2=4 x^6+2 x^5+2 x^4+10 x^3+35 x^2+15 x+33$
• $y^2=8 x^6+4 x^5+4 x^4+20 x^3+33 x^2+30 x+29$
• $y^2=18 x^6+12 x^5+6 x^4+36 x^3+36 x^2+25 x+3$
• $y^2=19 x^6+x^5+23 x^4+32 x^3+12 x^2+3 x+4$
• $y^2=15 x^6+35 x^5+11 x^4+23 x^3+22 x^2+29 x+9$
• $y^2=8 x^6+15 x^5+14 x^4+31 x^3+27 x^2+35 x+15$
• $y^2=16 x^6+30 x^5+28 x^4+25 x^3+17 x^2+33 x+30$
• $y^2=9 x^6+25 x^5+10 x^4+x^3+33 x^2+23 x+27$
• $y^2=18 x^6+13 x^5+20 x^4+2 x^3+29 x^2+9 x+17$
• $y^2=30 x^6+10 x^5+13 x^4+23 x^3+x^2+5 x+1$
• $y^2=23 x^6+20 x^5+26 x^4+9 x^3+2 x^2+10 x+2$
• $y^2=2 x^6+20 x^5+19 x^4+30 x^3+8 x^2+x+26$
• and

• $y^2=4 x^6+3 x^5+x^4+23 x^3+16 x^2+2 x+15$
• $y^2=30 x^6+3 x^5+33 x^4+20 x^3+16 x^2+10 x+32$
• $y^2=23 x^6+6 x^5+29 x^4+3 x^3+32 x^2+20 x+27$
• $y^2=21 x^6+32 x^5+28 x^4+25 x^3+3 x^2+20 x+11$
• $y^2=5 x^6+27 x^5+19 x^4+13 x^3+6 x^2+3 x+22$
• $y^2=29 x^6+7 x^5+11 x^4+10 x^3+18 x^2+27 x+36$
• $y^2=8 x^6+17 x^5+18 x^4+25 x^3+27 x^2+29 x+27$
• $y^2=12 x^6+26 x^5+28 x^4+10 x^3+6 x^2+28 x+17$
• $y^2=33 x^6+32 x^5+36 x^4+34 x^3+6 x^2+27 x+35$
• $y^2=29 x^6+27 x^5+35 x^4+31 x^3+12 x^2+17 x+33$
• $y^2=5 x^6+19 x^5+2 x^4+9 x^3+15 x^2+23 x+8$
• $y^2=10 x^6+x^5+4 x^4+18 x^3+30 x^2+9 x+16$
• $y^2=8 x^6+19 x^5+20 x^4+36 x^3+30 x^2+6 x+16$
• $y^2=16 x^6+x^5+3 x^4+35 x^3+23 x^2+12 x+32$
• $y^2=5 x^6+6 x^5+2 x^4+15 x^3+28 x^2+23 x+17$
• $y^2=10 x^6+12 x^5+4 x^4+30 x^3+19 x^2+9 x+34$
• $y^2=16 x^6+36 x^5+10 x^4+27 x^3+25 x^2+12 x+32$
• $y^2=32 x^6+35 x^5+20 x^4+17 x^3+13 x^2+24 x+27$
• $y^2=14 x^6+9 x^5+21 x^4+24 x^3+20 x^2+21 x+27$
• $y^2=12 x^6+6 x^5+19 x^3+2 x+17$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{37^{2}}$.

Endomorphism algebra over $\F_{37}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{39}, \sqrt{-109})\).

Endomorphism algebra over $\overline{\F}_{37}$

The base change of $A$ to $\F_{37^{2}}$ is 1.1369.bj^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-4251}) \)$)$

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.a_abj	$4$	(not in LMFDB)