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

• Label: 2.43.a_de
• 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:	$( 1 - 2 x + 43 x^{2} )( 1 + 2 x + 43 x^{2} )$
	$1 + 82 x^{2} + 1849 x^{4}$
Frobenius angles:	$\pm0.451268054243$, $\pm0.548731945757$
Angle rank:	$1$ (numerical)
Jacobians:	$56$

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$1932$	$3732624$	$6321459564$	$11667525682176$	$21611482324993932$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$44$	$2014$	$79508$	$3412750$	$147008444$	$6321556078$	$271818611108$	$11688195639454$	$502592611936844$	$21611482336703614$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 56 curves (of which all are hyperelliptic):

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

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

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.ac $\times$ 1.43.c 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.ac : \(\Q(\sqrt{-42}) \).
• 1.43.c : \(\Q(\sqrt{-42}) \).

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

The base change of $A$ to $\F_{43^{2}}$ is 1.1849.de^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-42}) \)$)$

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.ae_dm	$2$	(not in LMFDB)
2.43.e_dm	$2$	(not in LMFDB)
2.43.a_ade	$4$	(not in LMFDB)