Properties

Label 2.73.a_du
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:  $1 + 98 x^{2} + 5329 x^{4}$
Frobenius angles:  $\pm0.367117472975$, $\pm0.632882527025$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{3}, \sqrt{-61})\)
Galois group:  $C_2^2$
Jacobians:  $352$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5428$ $29463184$ $151333600756$ $806520013295616$ $4297625827579842868$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $74$ $5526$ $389018$ $28400350$ $2073071594$ $151332975222$ $11047398519098$ $806460203265214$ $58871586708267914$ $4297625825456128086$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 352 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 \(\Q(\sqrt{3}, \sqrt{-61})\).
Endomorphism algebra over $\overline{\F}_{73}$
The base change of $A$ to $\F_{73^{2}}$ is 1.5329.du 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-183}) \)$)$

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_adu$4$(not in LMFDB)
2.73.am_er$12$(not in LMFDB)
2.73.m_er$12$(not in LMFDB)