Abelian variety isogeny class 2.29.a_cc over $\F_{29}$

• Label: 2.29.a_cc
• Base field: $\F_{29}$
• 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:	$\F_{29}$
Dimension:	$2$
L-polynomial:	$( 1 - 2 x + 29 x^{2} )( 1 + 2 x + 29 x^{2} )$
	$1 + 54 x^{2} + 841 x^{4}$
Frobenius angles:	$\pm0.440546251002$, $\pm0.559453748998$
Angle rank:	$1$ (numerical)
Jacobians:	$34$
Cyclic group of points:	no
Non-cyclic primes:	$2$

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$896$	$802816$	$594844544$	$498503778304$	$420707221294976$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$30$	$950$	$24390$	$704814$	$20511150$	$594865766$	$17249876310$	$500246196574$	$14507145975870$	$420707209289750$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 34 curves (of which all are hyperelliptic):

• $y^2=4 x^6+12 x^5+6 x^4+28 x^3+7 x^2+26 x+23$
• $y^2=8 x^6+24 x^5+12 x^4+27 x^3+14 x^2+23 x+17$
• $y^2=25 x^6+28 x^5+17 x^3+15 x^2+28 x+9$
• $y^2=8 x^6+11 x^5+9 x^4+3 x^3+28 x^2+3 x+27$
• $y^2=16 x^6+22 x^5+18 x^4+6 x^3+27 x^2+6 x+25$
• $y^2=18 x^6+10 x^4+20 x^2+28$
• $y^2=13 x^6+2 x^4+4 x^2+17$
• $y^2=16 x^6+12 x^5+23 x^4+26 x^3+9 x^2+12 x+14$
• $y^2=25 x^6+16 x^5+21 x^4+16 x^3+26 x^2+24 x+17$
• $y^2=21 x^6+3 x^5+13 x^4+3 x^3+23 x^2+19 x+5$
• $y^2=26 x^6+27 x^5+20 x^4+18 x^3+25 x^2+15 x+10$
• $y^2=23 x^6+25 x^5+11 x^4+7 x^3+21 x^2+x+20$
• $y^2=22 x^6+14 x^5+28 x^4+25 x^3+23 x^2+11 x+25$
• $y^2=15 x^6+28 x^5+27 x^4+21 x^3+17 x^2+22 x+21$
• $y^2=3 x^6+15 x^4+x^2+24$
• $y^2=28 x^6+26 x^4+23 x^2+21$
• $y^2=12 x^6+x^5+10 x^4+11 x^3+12 x^2+20 x+27$
• $y^2=24 x^6+2 x^5+20 x^4+22 x^3+24 x^2+11 x+25$
• $y^2=5 x^6+28 x^5+20 x^4+26 x^3+20 x^2+28 x+5$
• $y^2=10 x^6+27 x^5+11 x^4+23 x^3+11 x^2+27 x+10$
• and

• $y^2=21 x^6+9 x^4+18 x^2+23$
• $y^2=10 x^6+3 x^4+6 x^2+22$
• $y^2=4 x^6+23 x^5+26 x^4+27 x^3+12 x^2+20 x+5$
• $y^2=8 x^6+17 x^5+23 x^4+25 x^3+24 x^2+11 x+10$
• $y^2=12 x^6+28 x^5+7 x^4+20 x^2+9 x+27$
• $y^2=24 x^6+27 x^5+14 x^4+11 x^2+18 x+25$
• $y^2=22 x^6+28 x^4+27 x^2+2$
• $y^2=9 x^6+13 x^4+26 x^2+14$
• $y^2=26 x^6+16 x^5+8 x^4+9 x^3+8 x^2+16 x+26$
• $y^2=23 x^6+3 x^5+16 x^4+18 x^3+16 x^2+3 x+23$
• $y^2=21 x^6+18 x^5+6 x^4+25 x^3+20 x^2+26 x+27$
• $y^2=13 x^6+7 x^5+12 x^4+21 x^3+11 x^2+23 x+25$
• $y^2=3 x^6+3 x^5+20 x^4+x^3+10 x^2+22 x+25$
• $y^2=6 x^6+6 x^5+11 x^4+2 x^3+20 x^2+15 x+21$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{29^{2}}$.

Endomorphism algebra over $\F_{29}$

The isogeny class factors as 1.29.ac $\times$ 1.29.c and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:

• 1.29.ac : \(\Q(\sqrt{-7}) \).
• 1.29.c : \(\Q(\sqrt{-7}) \).

Endomorphism algebra over $\overline{\F}_{29}$

The base change of $A$ to $\F_{29^{2}}$ is 1.841.cc^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-7}) \)$)$

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
2.29.ae_ck	$2$	(not in LMFDB)
2.29.e_ck	$2$	(not in LMFDB)
2.29.a_acc	$4$	(not in LMFDB)