Properties

Label 2.67.g_s
Base field $\F_{67}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple yes
Geometrically simple no
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{67}$
Dimension:  $2$
L-polynomial:  $1 + 6 x + 18 x^{2} + 402 x^{3} + 4489 x^{4}$
Frobenius angles:  $\pm0.333445870370$, $\pm0.833445870370$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(i, \sqrt{5})\)
Galois group:  $C_2^2$
Jacobians:  $264$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $4916$ $20155600$ $90789223844$ $406248211360000$ $1822702211130158756$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $74$ $4490$ $301862$ $20160078$ $1350024674$ $90458382170$ $6060704883902$ $406067718056158$ $27206534725131674$ $1822837804551761450$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 264 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{67^{4}}$.

Endomorphism algebra over $\F_{67}$
The endomorphism algebra of this simple isogeny class is \(\Q(i, \sqrt{5})\).
Endomorphism algebra over $\overline{\F}_{67}$
The base change of $A$ to $\F_{67^{4}}$ is 1.20151121.gqg 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-5}) \)$)$
Remainder of endomorphism lattice by field

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.67.ag_s$2$(not in LMFDB)
2.67.ag_s$4$(not in LMFDB)
2.67.a_aem$8$(not in LMFDB)

Below is a list of all twists of this isogeny class.

TwistExtension degreeCommon base change
2.67.ag_s$2$(not in LMFDB)
2.67.ag_s$4$(not in LMFDB)
2.67.a_aem$8$(not in LMFDB)
2.67.a_em$8$(not in LMFDB)