Properties

Label 2.97.a_gl
Base field $\F_{97}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple yes
Geometrically simple no
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

Related objects

Downloads

Learn more

Invariants

Base field:  $\F_{97}$
Dimension:  $2$
L-polynomial:  $1 + 167 x^{2} + 9409 x^{4}$
Frobenius angles:  $\pm0.415025864992$, $\pm0.584974135008$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\zeta_{12})\)
Galois group:  $C_2^2$
Jacobians:  $228$
Isomorphism classes:  122
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $9577$ $91718929$ $832971948484$ $7835827755484521$ $73742412674196414457$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $98$ $9744$ $912674$ $88511140$ $8587340258$ $832971892038$ $80798284478114$ $7837433783928004$ $760231058654565218$ $73742412658900002864$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 228 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{97^{2}}$.

Endomorphism algebra over $\F_{97}$
The endomorphism algebra of this simple isogeny class is \(\Q(\zeta_{12})\).
Endomorphism algebra over $\overline{\F}_{97}$
The base change of $A$ to $\F_{97^{2}}$ is 1.9409.gl 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-3}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.97.a_agn$3$(not in LMFDB)
2.97.a_c$3$(not in LMFDB)
2.97.abm_vj$4$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.97.a_agn$3$(not in LMFDB)
2.97.a_c$3$(not in LMFDB)
2.97.abm_vj$4$(not in LMFDB)
2.97.a_agl$4$(not in LMFDB)
2.97.bm_vj$4$(not in LMFDB)
2.97.abh_rs$12$(not in LMFDB)
2.97.abc_pa$12$(not in LMFDB)
2.97.ay_ld$12$(not in LMFDB)
2.97.at_ke$12$(not in LMFDB)
2.97.ao_dv$12$(not in LMFDB)
2.97.ak_il$12$(not in LMFDB)
2.97.aj_eu$12$(not in LMFDB)
2.97.af_acu$12$(not in LMFDB)
2.97.a_ac$12$(not in LMFDB)
2.97.a_gn$12$(not in LMFDB)
2.97.f_acu$12$(not in LMFDB)
2.97.j_eu$12$(not in LMFDB)
2.97.k_il$12$(not in LMFDB)
2.97.o_dv$12$(not in LMFDB)
2.97.t_ke$12$(not in LMFDB)
2.97.y_ld$12$(not in LMFDB)
2.97.bc_pa$12$(not in LMFDB)
2.97.bh_rs$12$(not in LMFDB)