Properties

Label 2.67.a_acw
Base field $\F_{67}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple yes
Geometrically simple no
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{67}$
Dimension:  $2$
L-polynomial:  $1 - 74 x^{2} + 4489 x^{4}$
Frobenius angles:  $\pm0.156886832233$, $\pm0.843113167767$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{13}, \sqrt{-15})\)
Galois group:  $C_2^2$
Jacobians:  $276$
Cyclic group of points:    no
Non-cyclic primes:   $2$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $4416$ $19501056$ $90458973504$ $406208868581376$ $1822837803972092736$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $68$ $4342$ $300764$ $20158126$ $1350125108$ $90459564838$ $6060711605324$ $406067733633118$ $27206534396294948$ $1822837803392424022$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 276 curves (of which all are hyperelliptic):

  • $y^2=55 x^6+51 x^5+29 x^4+45 x^3+40 x^2+25 x+35$
  • $y^2=21 x^6+59 x^5+11 x^4+10 x^3+46 x^2+25 x+30$
  • $y^2=42 x^6+51 x^5+22 x^4+20 x^3+25 x^2+50 x+60$
  • $y^2=56 x^6+20 x^5+9 x^4+8 x^3+24 x^2+37 x+22$
  • $y^2=37 x^6+51 x^5+58 x^4+20 x^3+24 x^2+13 x+65$
  • $y^2=7 x^6+35 x^5+49 x^4+40 x^3+48 x^2+26 x+63$
  • $y^2=2 x^6+57 x^5+20 x^4+4 x^3+30 x^2+61 x+56$
  • $y^2=4 x^6+47 x^5+40 x^4+8 x^3+60 x^2+55 x+45$
  • $y^2=45 x^6+7 x^5+58 x^4+46 x^3+57 x^2+56 x+58$
  • $y^2=23 x^6+14 x^5+49 x^4+25 x^3+47 x^2+45 x+49$
  • $y^2=16 x^6+28 x^5+20 x^4+46 x^3+30 x^2+21 x+23$
  • $y^2=27 x^6+31 x^5+12 x^4+64 x^3+33 x^2+10 x+57$
  • $y^2=54 x^6+62 x^5+24 x^4+61 x^3+66 x^2+20 x+47$
  • $y^2=39 x^5+8 x^4+5 x^3+36 x^2+35 x+34$
  • $y^2=11 x^5+16 x^4+10 x^3+5 x^2+3 x+1$
  • $y^2=22 x^6+31 x^5+31 x^4+29 x^3+25 x^2+62 x+19$
  • $y^2=61 x^6+x^5+6 x^4+25 x^3+28 x^2+45 x+62$
  • $y^2=59 x^6+58 x^5+26 x^4+36 x^3+63 x^2+43 x+5$
  • $y^2=3 x^6+5 x^5+20 x^4+29 x^3+34 x^2+27 x+43$
  • $y^2=6 x^6+10 x^5+40 x^4+58 x^3+x^2+54 x+19$
  • and 256 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{67^{2}}$.

Endomorphism algebra over $\F_{67}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{13}, \sqrt{-15})\).
Endomorphism algebra over $\overline{\F}_{67}$
The base change of $A$ to $\F_{67^{2}}$ is 1.4489.acw 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-195}) \)$)$

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.67.a_cw$4$(not in LMFDB)