Abelian variety isogeny class 2.43.a_cy over $\F_{43}$

• Label: 2.43.a_cy
• Base field: $\F_{43}$
• 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:	$\F_{43}$
Dimension:	$2$
L-polynomial:	$1 + 76 x^{2} + 1849 x^{4}$
Frobenius angles:	$\pm0.422484797803$, $\pm0.577515202197$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-2}, \sqrt{-5})\)
Galois group:	$C_2^2$
Jacobians:	$72$
Cyclic group of points:	no
Non-cyclic primes:	$3$

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$1926$	$3709476$	$6321380454$	$11674002892176$	$21611482089620886$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$44$	$2002$	$79508$	$3414646$	$147008444$	$6321397858$	$271818611108$	$11688205316638$	$502592611936844$	$21611481865957522$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 72 curves (of which all are hyperelliptic):

• $y^2=5 x^6+11 x^5+15 x^4+33 x^3+10 x^2+7 x+24$
• $y^2=15 x^6+33 x^5+2 x^4+13 x^3+30 x^2+21 x+29$
• $y^2=42 x^6+30 x^5+37 x^4+24 x^3+12 x^2+14 x+22$
• $y^2=40 x^6+4 x^5+25 x^4+29 x^3+36 x^2+42 x+23$
• $y^2=31 x^6+36 x^5+40 x^4+38 x^3+36 x^2+3 x+33$
• $y^2=7 x^6+22 x^5+34 x^4+28 x^3+22 x^2+9 x+13$
• $y^2=31 x^6+8 x^5+22 x^4+15 x^3+30 x^2+26 x+35$
• $y^2=7 x^6+24 x^5+23 x^4+2 x^3+4 x^2+35 x+19$
• $y^2=41 x^6+13 x^5+27 x^4+2 x^3+20 x^2+29 x+19$
• $y^2=37 x^6+39 x^5+38 x^4+6 x^3+17 x^2+x+14$
• $y^2=34 x^6+40 x^5+36 x^4+36 x^3+26 x^2+29 x+7$
• $y^2=16 x^6+34 x^5+22 x^4+22 x^3+35 x^2+x+21$
• $y^2=7 x^6+34 x^5+6 x^4+22 x^3+3 x^2+13 x+7$
• $y^2=21 x^6+16 x^5+18 x^4+23 x^3+9 x^2+39 x+21$
• $y^2=18 x^6+31 x^5+41 x^4+17 x^3+37 x^2+29 x+30$
• $y^2=11 x^6+7 x^5+37 x^4+8 x^3+25 x^2+x+4$
• $y^2=15 x^6+18 x^5+24 x^4+22 x^3+20 x^2+8 x+19$
• $y^2=2 x^6+11 x^5+29 x^4+23 x^3+17 x^2+24 x+14$
• $y^2=22 x^6+15 x^5+2 x^4+37 x^3+17 x^2+33 x+30$
• $y^2=23 x^6+2 x^5+6 x^4+25 x^3+8 x^2+13 x+4$
• and

• $y^2=12 x^6+5 x^5+16 x^4+x^3+7 x^2+13 x+42$
• $y^2=36 x^6+15 x^5+5 x^4+3 x^3+21 x^2+39 x+40$
• $y^2=29 x^6+x^5+16 x^4+37 x^3+5 x^2+9 x+31$
• $y^2=x^6+3 x^5+5 x^4+25 x^3+15 x^2+27 x+7$
• $y^2=20 x^6+4 x^5+40 x^4+17 x^3+20 x^2+4 x+15$
• $y^2=17 x^6+12 x^5+34 x^4+8 x^3+17 x^2+12 x+2$
• $y^2=29 x^6+40 x^5+17 x^4+25 x^3+37 x^2+16 x+27$
• $y^2=x^6+34 x^5+8 x^4+32 x^3+25 x^2+5 x+38$
• $y^2=3 x^6+5 x^5+36 x^4+34 x^3+15 x^2+34 x+29$
• $y^2=9 x^6+15 x^5+22 x^4+16 x^3+2 x^2+16 x+1$
• $y^2=29 x^6+24 x^5+35 x^4+18 x^3+19 x^2+42 x+17$
• $y^2=x^6+29 x^5+19 x^4+11 x^3+14 x^2+40 x+8$
• $y^2=37 x^6+17 x^5+23 x^4+21 x^3+4 x^2+12 x+27$
• $y^2=25 x^6+8 x^5+26 x^4+20 x^3+12 x^2+36 x+38$
• $y^2=32 x^6+4 x^5+4 x^4+40 x^3+39 x^2+17 x+41$
• $y^2=10 x^6+12 x^5+12 x^4+34 x^3+31 x^2+8 x+37$
• $y^2=18 x^6+4 x^5+9 x^4+6 x^3+24 x^2+11 x+32$
• $y^2=11 x^6+12 x^5+27 x^4+18 x^3+29 x^2+33 x+10$
• $y^2=41 x^6+11 x^5+5 x^4+35 x^3+42 x^2+22 x+11$
• $y^2=37 x^6+33 x^5+15 x^4+19 x^3+40 x^2+23 x+33$
• $y^2=21 x^6+14 x^5+6 x^4+34 x^3+32 x^2+29 x+32$
• $y^2=20 x^6+42 x^5+18 x^4+16 x^3+10 x^2+x+10$
• $y^2=29 x^6+6 x^5+16 x^4+9 x^3+23 x^2+37 x+3$
• $y^2=x^6+18 x^5+5 x^4+27 x^3+26 x^2+25 x+9$
• $y^2=16 x^6+22 x^5+13 x^4+25 x^3+21 x^2+33 x+28$
• $y^2=5 x^6+23 x^5+39 x^4+32 x^3+20 x^2+13 x+41$
• $y^2=25 x^6+20 x^5+19 x^4+8 x^3+22 x^2+40 x+13$
• $y^2=32 x^6+17 x^5+14 x^4+24 x^3+23 x^2+34 x+39$
• $y^2=10 x^6+29 x^5+16 x^4+5 x^3+26 x^2+29 x+32$
• $y^2=30 x^6+x^5+5 x^4+15 x^3+35 x^2+x+10$
• $y^2=25 x^6+17 x^5+6 x^4+30 x^3+15 x^2+39 x+35$
• $y^2=32 x^6+8 x^5+18 x^4+4 x^3+2 x^2+31 x+19$
• $y^2=30 x^6+7 x^5+5 x^4+42 x^3+15 x^2+15 x+40$
• $y^2=4 x^6+21 x^5+15 x^4+40 x^3+2 x^2+2 x+34$
• $y^2=7 x^6+36 x^5+x^4+13 x^3+20 x^2+42 x+24$
• $y^2=21 x^6+22 x^5+3 x^4+39 x^3+17 x^2+40 x+29$
• $y^2=32 x^6+27 x^5+39 x^3+35 x^2+35 x+42$
• $y^2=10 x^6+38 x^5+31 x^3+19 x^2+19 x+40$
• $y^2=32 x^6+31 x^5+29 x^4+6 x^3+17 x^2+18 x+14$
• $y^2=10 x^6+7 x^5+x^4+18 x^3+8 x^2+11 x+42$
• $y^2=30 x^6+29 x^5+x^4+35 x^3+30 x^2+25 x+7$
• $y^2=4 x^6+x^5+3 x^4+19 x^3+4 x^2+32 x+21$
• $y^2=32 x^6+3 x^5+7 x^4+10 x^3+8 x^2+31 x+37$
• $y^2=10 x^6+9 x^5+21 x^4+30 x^3+24 x^2+7 x+25$
• $y^2=2 x^6+7 x^5+13 x^4+5 x^3+x^2+6 x+11$
• $y^2=6 x^6+21 x^5+39 x^4+15 x^3+3 x^2+18 x+33$
• $y^2=26 x^6+33 x^5+38 x^4+21 x^3+17 x^2+21 x+18$
• $y^2=35 x^6+13 x^5+28 x^4+20 x^3+8 x^2+20 x+11$
• $y^2=36 x^6+23 x^5+38 x^4+21 x^3+21 x^2+10 x+33$
• $y^2=22 x^6+26 x^5+28 x^4+20 x^3+20 x^2+30 x+13$
• $y^2=37 x^6+23 x^5+23 x^4+17 x^3+32 x^2+4 x+26$
• $y^2=25 x^6+26 x^5+26 x^4+8 x^3+10 x^2+12 x+35$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{43^{2}}$.

Endomorphism algebra over $\F_{43}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-2}, \sqrt{-5})\).

Endomorphism algebra over $\overline{\F}_{43}$

The base change of $A$ to $\F_{43^{2}}$ is 1.1849.cy^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-5}) \)$)$

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
2.43.a_acy	$4$	(not in LMFDB)
2.43.as_gg	$8$	(not in LMFDB)
2.43.s_gg	$8$	(not in LMFDB)