Properties

Label 2.97.g_gw
Base field $\F_{97}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple no
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:  $( 1 - 2 x + 97 x^{2} )( 1 + 8 x + 97 x^{2} )$
  $1 + 6 x + 178 x^{2} + 582 x^{3} + 9409 x^{4}$
Frobenius angles:  $\pm0.467624736821$, $\pm0.633124938748$
Angle rank:  $2$ (numerical)
Jacobians:  $646$
Cyclic group of points:    no
Non-cyclic primes:   $2$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $10176$ $91584000$ $831839246784$ $7836073574400000$ $73743018666408517056$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $104$ $9730$ $911432$ $88513918$ $8587410824$ $832972028290$ $80798292405032$ $7837433646147838$ $760231056255397544$ $73742412689839355650$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 646 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{97}$
The isogeny class factors as 1.97.ac $\times$ 1.97.i and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:

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.ak_ic$2$(not in LMFDB)
2.97.ag_gw$2$(not in LMFDB)
2.97.k_ic$2$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.97.ak_ic$2$(not in LMFDB)
2.97.ag_gw$2$(not in LMFDB)
2.97.k_ic$2$(not in LMFDB)
2.97.au_iw$4$(not in LMFDB)
2.97.aq_gc$4$(not in LMFDB)
2.97.q_gc$4$(not in LMFDB)
2.97.u_iw$4$(not in LMFDB)