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

• Label: 2.43.a_bl
• Base field: $\F_{43}$
• 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:	$\F_{43}$
Dimension:	$2$
L-polynomial:	$( 1 - 7 x + 43 x^{2} )( 1 + 7 x + 43 x^{2} )$
	$1 + 37 x^{2} + 1849 x^{4}$
Frobenius angles:	$\pm0.320784221581$, $\pm0.679215778419$
Angle rank:	$1$ (numerical)
Jacobians:	$66$
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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$1887$	$3560769$	$6321208464$	$11704137319161$	$21611482546819407$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$44$	$1924$	$79508$	$3423460$	$147008444$	$6321053878$	$271818611108$	$11688203104324$	$502592611936844$	$21611482780354564$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 66 curves (of which all are hyperelliptic):

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

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

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{43}$

The isogeny class factors as 1.43.ah $\times$ 1.43.h and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:

• 1.43.ah : \(\Q(\sqrt{-123}) \).
• 1.43.h : \(\Q(\sqrt{-123}) \).

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

The base change of $A$ to $\F_{43^{2}}$ is 1.1849.bl^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-123}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

Twist	Extension degree	Common base change
2.43.ao_ff	$2$	(not in LMFDB)
2.43.o_ff	$2$	(not in LMFDB)
2.43.a_abl	$4$	(not in LMFDB)