Abelian variety isogeny class 2.41.ad_abg over $\F_{41}$

• Label: 2.41.ad_abg
• Base field: $\F_{41}$
• 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:	$\F_{41}$
Dimension:	$2$
L-polynomial:	$1 - 3 x - 32 x^{2} - 123 x^{3} + 1681 x^{4}$
Frobenius angles:	$\pm0.0913997543450$, $\pm0.758066421012$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-3}, \sqrt{-155})\)
Galois group:	$C_2^2$
Jacobians:	$44$
Isomorphism classes:	128
Cyclic group of points:	no
Non-cyclic primes:	$2$

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$1524$	$2706624$	$4703216400$	$7990484546304$	$13420351388109684$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$39$	$1609$	$68238$	$2827729$	$115836279$	$4750145998$	$194755153359$	$7984923446689$	$327381995816478$	$13422659475365929$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 44 curves (of which all are hyperelliptic):

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

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

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{41^{3}}$.

Endomorphism algebra over $\F_{41}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-3}, \sqrt{-155})\).

Endomorphism algebra over $\overline{\F}_{41}$

The base change of $A$ to $\F_{41^{3}}$ is 1.68921.ane^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-155}) \)$)$

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
2.41.d_abg	$2$	(not in LMFDB)
2.41.g_dn	$3$	(not in LMFDB)
2.41.ag_dn	$6$	(not in LMFDB)