Abelian variety isogeny class 4.3.ah_ba_acr_fi over $\F_{3}$

• Label: 4.3.ah_ba_acr_fi
• Base field: $\F_{3}$
• Dimension: $4$
• $p$-rank: $2$
• Ordinary: no
• Supersingular: no
• Simple: no
• Geometrically simple: no
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: no

Invariants

Base field:	$\F_{3}$
Dimension:	$4$
L-polynomial:	$( 1 - 3 x + 3 x^{2} )( 1 + 3 x^{2} )( 1 - 4 x + 8 x^{2} - 12 x^{3} + 9 x^{4} )$
	$1 - 7 x + 26 x^{2} - 69 x^{3} + 138 x^{4} - 207 x^{5} + 234 x^{6} - 189 x^{7} + 81 x^{8}$
Frobenius angles:	$\pm0.0540867239847$, $\pm0.166666666667$, $\pm0.445913276015$, $\pm0.5$
Angle rank:	$1$ (numerical)
Isomorphism classes:	15

This isogeny class is not simple, primitive, not ordinary, and not supersingular. It is principally polarizable.

Newton polygon

$p$-rank:	$2$
Slopes:	$[0, 0, 1/2, 1/2, 1/2, 1/2, 1, 1]$

Point counts

Point counts of the abelian variety

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$8$	$7616$	$490784$	$26930176$	$3258722968$

Point counts of the (virtual) curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$-3$	$13$	$24$	$45$	$227$	$838$	$2321$	$6413$	$19392$	$59293$

Jacobians and polarizations

This isogeny class is principally polarizable, but does not contain a Jacobian.

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{3^{12}}$.

Endomorphism algebra over $\F_{3}$

The isogeny class factors as 1.3.ad $\times$ 1.3.a $\times$ 2.3.ae_i and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:

• 1.3.ad : \(\Q(\sqrt{-3}) \).
• 1.3.a : \(\Q(\sqrt{-3}) \).
• 2.3.ae_i : \(\Q(\zeta_{8})\).

Endomorphism algebra over $\overline{\F}_{3}$

The base change of $A$ to $\F_{3^{12}}$ is 1.531441.acec^2 $\times$ 1.531441.zi^2. The endomorphism algebra for each factor is:

• 1.531441.acec^2 : $\mathrm{M}_{2}(B)$, where $B$ is the quaternion algebra over \(\Q\) ramified at $3$ and $\infty$.
• 1.531441.zi^2 : $\mathrm{M}_{2}($\(\Q(\sqrt{-2}) \)$)$

Remainder of endomorphism lattice by field

• Endomorphism algebra over $\F_{3^{2}}$
  The base change of $A$ to $\F_{3^{2}}$ is 1.9.ad $\times$ 1.9.g $\times$ 2.9.a_ao. The endomorphism algebra for each factor is:

  • 1.9.ad : \(\Q(\sqrt{-3}) \).
  • 1.9.g : the quaternion algebra over \(\Q\) ramified at $3$ and $\infty$.
  • 2.9.a_ao : \(\Q(\zeta_{8})\).
• Endomorphism algebra over $\F_{3^{3}}$
  The base change of $A$ to $\F_{3^{3}}$ is 1.27.a^2 $\times$ 2.27.ae_i. The endomorphism algebra for each factor is:

  • 1.27.a^2 : $\mathrm{M}_{2}($\(\Q(\sqrt{-3}) \)$)$
  • 2.27.ae_i : \(\Q(\zeta_{8})\).
• Endomorphism algebra over $\F_{3^{4}}$
  The base change of $A$ to $\F_{3^{4}}$ is 1.81.as $\times$ 1.81.ao^2 $\times$ 1.81.j. The endomorphism algebra for each factor is:

  • 1.81.as : the quaternion algebra over \(\Q\) ramified at $3$ and $\infty$.
  • 1.81.ao^2 : $\mathrm{M}_{2}($\(\Q(\sqrt{-2}) \)$)$
  • 1.81.j : \(\Q(\sqrt{-3}) \).
• Endomorphism algebra over $\F_{3^{6}}$
  The base change of $A$ to $\F_{3^{6}}$ is 1.729.cc^2 $\times$ 2.729.a_zi. The endomorphism algebra for each factor is:

  • 1.729.cc^2 : $\mathrm{M}_{2}(B)$, where $B$ is the quaternion algebra over \(\Q\) ramified at $3$ and $\infty$.
  • 2.729.a_zi : \(\Q(\zeta_{8})\).

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
4.3.ab_c_ad_ag	$2$	(not in LMFDB)
4.3.b_c_d_ag	$2$	(not in LMFDB)
4.3.h_ba_cr_fi	$2$	(not in LMFDB)
4.3.ak_bv_afi_kw	$3$	(not in LMFDB)
4.3.ae_f_a_ag	$3$	(not in LMFDB)
4.3.ae_o_abk_co	$3$	(not in LMFDB)
4.3.ab_c_ad_ag	$3$	(not in LMFDB)
4.3.c_ab_ag_ag	$3$	(not in LMFDB)