Properties

Label 2.67.a_a
Base field $\F_{67}$
Dimension $2$
$p$-rank $0$
Ordinary no
Supersingular yes
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:  $1 + 4489 x^{4}$
Frobenius angles:  $\pm0.250000000000$, $\pm0.750000000000$
Angle rank:  $0$ (numerical)
Number field:  \(\Q(i, \sqrt{134})\)
Galois group:  $C_2^2$
Jacobians:  $244$
Cyclic group of points:    yes

This isogeny class is simple but not geometrically simple, primitive, not ordinary, and supersingular. It is principally polarizable and contains a Jacobian.

Newton polygon

This isogeny class is supersingular.

$p$-rank:  $0$
Slopes:  $[1/2, 1/2, 1/2, 1/2]$

Point counts

Point counts of the abelian variety

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $4490$ $20160100$ $90458382170$ $406429632010000$ $1822837804551761450$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $68$ $4490$ $300764$ $20169078$ $1350125108$ $90458382170$ $6060711605324$ $406067596952158$ $27206534396294948$ $1822837804551761450$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 244 curves (of which all are hyperelliptic):

  • $y^2=x^5+66$
  • $y^2=2 x^5+65$
  • $y^2=34 x^6+48 x^5+5 x^4+30 x^3+38 x^2+11 x+17$
  • $y^2=x^6+29 x^5+10 x^4+60 x^3+9 x^2+22 x+34$
  • $y^2=33 x^6+7 x^5+x^4+60 x^3+61 x^2+31 x+29$
  • $y^2=66 x^6+14 x^5+2 x^4+53 x^3+55 x^2+62 x+58$
  • $y^2=39 x^6+50 x^5+39 x^4+28 x^3+64 x^2+50 x+44$
  • $y^2=11 x^6+33 x^5+11 x^4+56 x^3+61 x^2+33 x+21$
  • $y^2=35 x^6+28 x^5+12 x^4+36 x^3+8 x^2+31 x+13$
  • $y^2=3 x^6+56 x^5+24 x^4+5 x^3+16 x^2+62 x+26$
  • $y^2=33 x^6+7 x^5+44 x^4+44 x^2+60 x+33$
  • $y^2=66 x^6+14 x^5+21 x^4+21 x^2+53 x+66$
  • $y^2=52 x^6+51 x^5+46 x^4+20 x^3+5 x^2+2 x+59$
  • $y^2=37 x^6+35 x^5+25 x^4+40 x^3+10 x^2+4 x+51$
  • $y^2=10 x^6+15 x^5+46 x^4+17 x^3+57 x^2+66 x+25$
  • $y^2=20 x^6+30 x^5+25 x^4+34 x^3+47 x^2+65 x+50$
  • $y^2=39 x^6+60 x^5+61 x^4+46 x^3+34 x^2+2 x+48$
  • $y^2=11 x^6+53 x^5+55 x^4+25 x^3+x^2+4 x+29$
  • $y^2=32 x^6+22 x^5+53 x^4+66 x^3+35 x^2+63 x+7$
  • $y^2=64 x^6+44 x^5+39 x^4+65 x^3+3 x^2+59 x+14$
  • and 224 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{67^{4}}$.

Endomorphism algebra over $\F_{67}$
The endomorphism algebra of this simple isogeny class is \(\Q(i, \sqrt{134})\).
Endomorphism algebra over $\overline{\F}_{67}$
The base change of $A$ to $\F_{67^{4}}$ is 1.20151121.nhi 2 and its endomorphism algebra is $\mathrm{M}_{2}(B)$, where $B$ is the quaternion algebra over \(\Q\) ramified at $67$ and $\infty$.
Remainder of endomorphism lattice by field
  • Endomorphism algebra over $\F_{67^{2}}$
    The base change of $A$ to $\F_{67^{2}}$ is 1.4489.a 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-1}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.67.a_afe$8$(not in LMFDB)
2.67.a_fe$8$(not in LMFDB)
2.67.a_acp$24$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.67.a_afe$8$(not in LMFDB)
2.67.a_fe$8$(not in LMFDB)
2.67.a_acp$24$(not in LMFDB)
2.67.a_cp$24$(not in LMFDB)