Properties

Label 2.73.a_fa
Base field $\F_{73}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple no
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:  $( 1 - 4 x + 73 x^{2} )( 1 + 4 x + 73 x^{2} )$
  $1 + 130 x^{2} + 5329 x^{4}$
Frobenius angles:  $\pm0.424791481369$, $\pm0.575208518631$
Angle rank:  $1$ (numerical)
Jacobians:  $480$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5460$ $29811600$ $151334344980$ $806105664000000$ $4297625826752649300$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $74$ $5590$ $389018$ $28385758$ $2073071594$ $151334463670$ $11047398519098$ $806460127561918$ $58871586708267914$ $4297625823801740950$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 480 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 isogeny class factors as 1.73.ae $\times$ 1.73.e and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:
Endomorphism algebra over $\overline{\F}_{73}$
The base change of $A$ to $\F_{73^{2}}$ is 1.5329.fa 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-69}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.73.ai_gg$2$(not in LMFDB)
2.73.i_gg$2$(not in LMFDB)
2.73.a_afa$4$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.73.ai_gg$2$(not in LMFDB)
2.73.i_gg$2$(not in LMFDB)
2.73.a_afa$4$(not in LMFDB)
2.73.ae_acf$6$(not in LMFDB)
2.73.e_acf$6$(not in LMFDB)