Properties

Label 2.73.a_as
Base field $\F_{73}$
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:  $\F_{73}$
Dimension:  $2$
L-polynomial:  $1 - 18 x^{2} + 5329 x^{4}$
Frobenius angles:  $\pm0.230328106416$, $\pm0.769671893584$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{-2}, \sqrt{41})\)
Galois group:  $C_2^2$
Jacobians:  $368$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5312$ $28217344$ $151334508224$ $807047190347776$ $4297625827301220032$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $74$ $5294$ $389018$ $28418910$ $2073071594$ $151334790158$ $11047398519098$ $806459991903934$ $58871586708267914$ $4297625824898882414$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 368 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{73^{2}}$.

Endomorphism algebra over $\F_{73}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-2}, \sqrt{41})\).
Endomorphism algebra over $\overline{\F}_{73}$
The base change of $A$ to $\F_{73^{2}}$ is 1.5329.as 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-82}) \)$)$

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.73.a_s$4$(not in LMFDB)
2.73.aq_ey$8$(not in LMFDB)
2.73.q_ey$8$(not in LMFDB)