Properties

Label 2.97.a_ac
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:  $( 1 - 14 x + 97 x^{2} )( 1 + 14 x + 97 x^{2} )$
  $1 - 2 x^{2} + 9409 x^{4}$
Frobenius angles:  $\pm0.248359198326$, $\pm0.751640801674$
Angle rank:  $1$ (numerical)
Jacobians:  $726$
Cyclic group of points:    no
Non-cyclic primes:   $2, 7$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $9408$ $88510464$ $832972061376$ $7840765305225216$ $73742412688607909568$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $98$ $9406$ $912674$ $88566910$ $8587340258$ $832972117822$ $80798284478114$ $7837433240560894$ $760231058654565218$ $73742412687722993086$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 726 curves (of which all are hyperelliptic):

  • $y^2=41 x^6+61 x^5+75 x^4+2 x^3+9 x^2+25 x+4$
  • $y^2=11 x^6+14 x^5+84 x^4+10 x^3+45 x^2+28 x+20$
  • $y^2=22 x^6+22 x^5+46 x^4+56 x^3+26 x^2+19 x+81$
  • $y^2=13 x^6+13 x^5+36 x^4+86 x^3+33 x^2+95 x+17$
  • $y^2=91 x^6+11 x^5+84 x^4+74 x^3+90 x^2+60 x+38$
  • $y^2=67 x^6+55 x^5+32 x^4+79 x^3+62 x^2+9 x+93$
  • $y^2=75 x^6+64 x^5+66 x^4+36 x^3+10 x^2+13 x+73$
  • $y^2=84 x^6+29 x^5+39 x^4+83 x^3+50 x^2+65 x+74$
  • $y^2=95 x^6+46 x^5+55 x^4+25 x^3+96 x^2+93 x+56$
  • $y^2=87 x^6+36 x^5+81 x^4+28 x^3+92 x^2+77 x+86$
  • $y^2=92 x^6+70 x^5+2 x^4+18 x^3+68 x^2+33 x+56$
  • $y^2=72 x^6+59 x^5+10 x^4+90 x^3+49 x^2+68 x+86$
  • $y^2=17 x^6+60 x^5+42 x^4+24 x^3+19 x^2+7 x+82$
  • $y^2=85 x^6+9 x^5+16 x^4+23 x^3+95 x^2+35 x+22$
  • $y^2=14 x^6+23 x^5+73 x^4+83 x^3+73 x^2+23 x+14$
  • $y^2=70 x^6+18 x^5+74 x^4+27 x^3+74 x^2+18 x+70$
  • $y^2=17 x^6+6 x^5+7 x^4+42 x^3+49 x^2+13 x+37$
  • $y^2=85 x^6+30 x^5+35 x^4+16 x^3+51 x^2+65 x+88$
  • $y^2=53 x^6+28 x^5+78 x^4+77 x^3+13 x^2+64 x+15$
  • $y^2=71 x^6+43 x^5+2 x^4+94 x^3+65 x^2+29 x+75$
  • and 706 more

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{97}$
The isogeny class factors as 1.97.ao $\times$ 1.97.o and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:
Endomorphism algebra over $\overline{\F}_{97}$
The base change of $A$ to $\F_{97^{2}}$ is 1.9409.ac 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.abc_pa$2$(not in LMFDB)
2.97.bc_pa$2$(not in LMFDB)
2.97.abh_rs$3$(not in LMFDB)
2.97.ay_ld$3$(not in LMFDB)
2.97.aj_eu$3$(not in LMFDB)
2.97.a_agl$3$(not in LMFDB)
2.97.a_gn$3$(not in LMFDB)
2.97.j_eu$3$(not in LMFDB)
2.97.y_ld$3$(not in LMFDB)
2.97.bh_rs$3$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.97.abc_pa$2$(not in LMFDB)
2.97.bc_pa$2$(not in LMFDB)
2.97.abh_rs$3$(not in LMFDB)
2.97.ay_ld$3$(not in LMFDB)
2.97.aj_eu$3$(not in LMFDB)
2.97.a_agl$3$(not in LMFDB)
2.97.a_gn$3$(not in LMFDB)
2.97.j_eu$3$(not in LMFDB)
2.97.y_ld$3$(not in LMFDB)
2.97.bh_rs$3$(not in LMFDB)
2.97.a_c$4$(not in LMFDB)
2.97.abm_vj$6$(not in LMFDB)
2.97.at_ke$6$(not in LMFDB)
2.97.ao_dv$6$(not in LMFDB)
2.97.ak_il$6$(not in LMFDB)
2.97.af_acu$6$(not in LMFDB)
2.97.f_acu$6$(not in LMFDB)
2.97.j_eu$6$(not in LMFDB)
2.97.k_il$6$(not in LMFDB)
2.97.o_dv$6$(not in LMFDB)
2.97.t_ke$6$(not in LMFDB)
2.97.bm_vj$6$(not in LMFDB)
2.97.a_agn$12$(not in LMFDB)
2.97.a_gl$12$(not in LMFDB)