Properties

Label 2.97.ai_fq
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:  $( 1 - 12 x + 97 x^{2} )( 1 + 4 x + 97 x^{2} )$
  $1 - 8 x + 146 x^{2} - 776 x^{3} + 9409 x^{4}$
Frobenius angles:  $\pm0.291487575149$, $\pm0.565091650464$
Angle rank:  $2$ (numerical)
Jacobians:  $384$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $8772$ $90702480$ $833577905412$ $7837739164569600$ $73743983094663083652$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $90$ $9638$ $913338$ $88532734$ $8587523130$ $832971333926$ $80798248841946$ $7837433516683006$ $760231060994552346$ $73742412698215850918$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 384 curves (of which all are hyperelliptic):

  • $y^2=95 x^6+77 x^5+74 x^4+2 x^3+92 x^2+89 x+5$
  • $y^2=90 x^6+25 x^5+77 x^4+88 x^3+29 x^2+88 x+41$
  • $y^2=70 x^6+35 x^5+11 x^4+50 x^3+61 x^2+82 x+33$
  • $y^2=78 x^6+93 x^5+52 x^4+22 x^3+7 x^2+95 x+15$
  • $y^2=96 x^6+54 x^5+21 x^4+93 x^3+27 x^2+14 x+55$
  • $y^2=74 x^6+79 x^5+2 x^4+85 x^3+77 x^2+87 x+19$
  • $y^2=52 x^6+22 x^5+23 x^4+15 x^3+30 x^2+19 x+23$
  • $y^2=27 x^6+49 x^5+52 x^4+61 x^3+49 x^2+76 x+90$
  • $y^2=76 x^6+62 x^5+72 x^4+38 x^3+32 x^2+80 x+81$
  • $y^2=6 x^6+12 x^5+37 x^4+18 x^3+35 x^2+59 x+82$
  • $y^2=61 x^6+41 x^5+53 x^4+20 x^3+76 x^2+13 x+44$
  • $y^2=80 x^6+50 x^5+27 x^4+25 x^3+8 x^2+96 x+33$
  • $y^2=16 x^6+25 x^5+90 x^4+39 x^3+96 x^2+20 x+74$
  • $y^2=48 x^6+66 x^5+25 x^4+18 x^3+23 x^2+29 x+62$
  • $y^2=71 x^6+95 x^5+88 x^4+96 x^3+72 x^2+67 x+29$
  • $y^2=23 x^6+67 x^5+54 x^4+25 x^3+43 x^2+94 x+69$
  • $y^2=x^6+78 x^5+93 x^4+88 x^3+78 x^2+38 x+84$
  • $y^2=9 x^6+67 x^5+63 x^4+51 x^3+50 x^2+42 x+60$
  • $y^2=47 x^6+81 x^5+84 x^4+89 x^3+17 x^2+5 x+60$
  • $y^2=90 x^6+46 x^5+78 x^4+39 x^3+27 x^2+58 x+95$
  • and 364 more

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{97}$
The isogeny class factors as 1.97.am $\times$ 1.97.e 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 is a list of all twists of this isogeny class.

TwistExtension degreeCommon base change
2.97.aq_ji$2$(not in LMFDB)
2.97.i_fq$2$(not in LMFDB)
2.97.q_ji$2$(not in LMFDB)