Properties

Label 2.83.q_gr
Base field $\F_{83}$
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:  $\F_{83}$
Dimension:  $2$
L-polynomial:  $1 + 16 x + 173 x^{2} + 1328 x^{3} + 6889 x^{4}$
Frobenius angles:  $\pm0.507864978640$, $\pm0.825468354694$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{-3}, \sqrt{-19})\)
Galois group:  $C_2^2$
Jacobians:  $232$
Isomorphism classes:  120
Cyclic group of points:    yes

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $8407$ $48079633$ $326813448976$ $2252022748568089$ $15515646722009380807$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $100$ $6980$ $571564$ $47452644$ $3938940500$ $326942635430$ $27136041205100$ $2252292169462084$ $186940255648971412$ $15516041189356592900$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 232 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{83^{3}}$.

Endomorphism algebra over $\F_{83}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-3}, \sqrt{-19})\).
Endomorphism algebra over $\overline{\F}_{83}$
The base change of $A$ to $\F_{83^{3}}$ is 1.571787.aei 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-19}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.83.aq_gr$2$(not in LMFDB)
2.83.abg_qg$3$(not in LMFDB)
2.83.aq_gr$6$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.83.aq_gr$2$(not in LMFDB)
2.83.abg_qg$3$(not in LMFDB)
2.83.aq_gr$6$(not in LMFDB)
2.83.a_adm$6$(not in LMFDB)
2.83.bg_qg$6$(not in LMFDB)
2.83.a_dm$12$(not in LMFDB)