Properties

Label 2.97.c_gd
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

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Invariants

Base field:  $\F_{97}$
Dimension:  $2$
L-polynomial:  $( 1 - 5 x + 97 x^{2} )( 1 + 7 x + 97 x^{2} )$
  $1 + 2 x + 159 x^{2} + 194 x^{3} + 9409 x^{4}$
Frobenius angles:  $\pm0.418307468341$, $\pm0.615645519409$
Angle rank:  $2$ (numerical)
Jacobians:  $546$
Cyclic group of points:    no
Non-cyclic primes:   $3$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $9765$ $91527345$ $832639363920$ $7836375868018425$ $73742430210067223325$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $100$ $9724$ $912310$ $88517332$ $8587342300$ $832971017086$ $80798291872300$ $7837433848697188$ $760231057142677750$ $73742412659939837164$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 546 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.af $\times$ 1.97.h 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.am_iv$2$(not in LMFDB)
2.97.ac_gd$2$(not in LMFDB)
2.97.m_iv$2$(not in LMFDB)
2.97.ah_ds$3$(not in LMFDB)
2.97.ba_mp$3$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.97.am_iv$2$(not in LMFDB)
2.97.ac_gd$2$(not in LMFDB)
2.97.m_iv$2$(not in LMFDB)
2.97.ah_ds$3$(not in LMFDB)
2.97.ba_mp$3$(not in LMFDB)
2.97.aba_mp$6$(not in LMFDB)
2.97.av_lg$6$(not in LMFDB)
2.97.am_cj$6$(not in LMFDB)
2.97.h_ds$6$(not in LMFDB)
2.97.m_cj$6$(not in LMFDB)
2.97.v_lg$6$(not in LMFDB)