Properties

Label 2.83.a_aes
Base field $\F_{83}$
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:  $\F_{83}$
Dimension:  $2$
L-polynomial:  $1 - 122 x^{2} + 6889 x^{4}$
Frobenius angles:  $\pm0.118605205367$, $\pm0.881394794633$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{2}, \sqrt{-11})\)
Galois group:  $C_2^2$
Jacobians:  $235$
Cyclic group of points:    no
Non-cyclic primes:   $2, 3$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6768$ $45805824$ $326941078896$ $2252187350470656$ $15516041193776080368$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $84$ $6646$ $571788$ $47456110$ $3939040644$ $326941784422$ $27136050989628$ $2252292419525854$ $186940255267540404$ $15516041200346307286$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 235 curves (of which all are hyperelliptic):

  • $y^2=27 x^6+64 x^5+41 x^4+60 x^3+56 x^2+40 x+19$
  • $y^2=62 x^6+29 x^5+18 x^4+17 x^3+33 x^2+12 x+17$
  • $y^2=41 x^6+58 x^5+36 x^4+34 x^3+66 x^2+24 x+34$
  • $y^2=22 x^6+30 x^5+28 x^4+71 x^3+16 x^2+39 x+9$
  • $y^2=44 x^6+60 x^5+56 x^4+59 x^3+32 x^2+78 x+18$
  • $y^2=23 x^6+15 x^5+56 x^4+68 x^3+23 x^2+15 x+31$
  • $y^2=3 x^6+32 x^5+55 x^4+66 x^3+52 x^2+77 x+9$
  • $y^2=6 x^6+64 x^5+27 x^4+49 x^3+21 x^2+71 x+18$
  • $y^2=56 x^6+69 x^5+31 x^4+56 x^3+36 x^2+73 x+72$
  • $y^2=29 x^6+55 x^5+62 x^4+29 x^3+72 x^2+63 x+61$
  • $y^2=32 x^6+51 x^5+3 x^4+23 x^3+52 x^2+77 x+66$
  • $y^2=33 x^6+69 x^5+13 x^4+42 x^3+4 x^2+22 x+17$
  • $y^2=13 x^6+14 x^5+6 x^4+17 x^3+x^2+81 x+68$
  • $y^2=28 x^5+47 x^4+80 x^3+68 x^2+21 x$
  • $y^2=48 x^6+52 x^5+53 x^4+68 x^3+66 x^2+9 x+54$
  • $y^2=13 x^6+21 x^5+23 x^4+53 x^3+49 x^2+18 x+25$
  • $y^2=51 x^6+8 x^5+62 x^4+45 x^3+75 x^2+35 x+27$
  • $y^2=19 x^6+16 x^5+41 x^4+7 x^3+67 x^2+70 x+54$
  • $y^2=73 x^6+28 x^5+36 x^4+56 x^3+36 x^2+4 x+39$
  • $y^2=63 x^6+56 x^5+72 x^4+29 x^3+72 x^2+8 x+78$
  • and 215 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{83^{2}}$.

Endomorphism algebra over $\F_{83}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{2}, \sqrt{-11})\).
Endomorphism algebra over $\overline{\F}_{83}$
The base change of $A$ to $\F_{83^{2}}$ is 1.6889.aes 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-22}) \)$)$

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.83.a_es$4$(not in LMFDB)
2.83.ay_lc$8$(not in LMFDB)
2.83.y_lc$8$(not in LMFDB)