Properties

Label 2.83.a_ei
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:  $1 + 112 x^{2} + 6889 x^{4}$
Frobenius angles:  $\pm0.367863234133$, $\pm0.632136765867$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{6}, \sqrt{-278})\)
Galois group:  $C_2^2$
Jacobians:  $312$
Cyclic group of points:    no
Non-cyclic primes:   $3$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $7002$ $49028004$ $326939463594$ $2252409455717136$ $15516041183013185082$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $84$ $7114$ $571788$ $47460790$ $3939040644$ $326938553818$ $27136050989628$ $2252292418926814$ $186940255267540404$ $15516041178820516714$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 312 curves (of which all are hyperelliptic):

  • $y^2=x^6+50 x^5+18 x^4+70 x^3+7 x^2+6 x+23$
  • $y^2=2 x^6+17 x^5+36 x^4+57 x^3+14 x^2+12 x+46$
  • $y^2=14 x^6+55 x^5+36 x^4+63 x^3+17 x^2+82 x+30$
  • $y^2=28 x^6+27 x^5+72 x^4+43 x^3+34 x^2+81 x+60$
  • $y^2=5 x^6+42 x^5+29 x^4+71 x^3+13 x^2+59 x+7$
  • $y^2=10 x^6+x^5+58 x^4+59 x^3+26 x^2+35 x+14$
  • $y^2=78 x^6+76 x^5+44 x^4+27 x^3+27 x^2+12 x+74$
  • $y^2=73 x^6+69 x^5+5 x^4+54 x^3+54 x^2+24 x+65$
  • $y^2=19 x^6+x^5+14 x^4+24 x^3+71 x^2+61 x+54$
  • $y^2=38 x^6+2 x^5+28 x^4+48 x^3+59 x^2+39 x+25$
  • $y^2=37 x^6+56 x^5+44 x^4+22 x^3+23 x^2+33 x+44$
  • $y^2=74 x^6+29 x^5+5 x^4+44 x^3+46 x^2+66 x+5$
  • $y^2=67 x^6+63 x^5+2 x^4+2 x^3+19 x^2+75 x+51$
  • $y^2=51 x^6+43 x^5+4 x^4+4 x^3+38 x^2+67 x+19$
  • $y^2=17 x^6+51 x^5+32 x^4+35 x^3+59 x^2+56 x+76$
  • $y^2=34 x^6+19 x^5+64 x^4+70 x^3+35 x^2+29 x+69$
  • $y^2=58 x^6+33 x^5+48 x^4+45 x^3+21 x^2+26 x+8$
  • $y^2=33 x^6+66 x^5+13 x^4+7 x^3+42 x^2+52 x+16$
  • $y^2=49 x^6+45 x^5+62 x^4+2 x^3+63 x^2+46 x+7$
  • $y^2=15 x^6+7 x^5+41 x^4+4 x^3+43 x^2+9 x+14$
  • and 292 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 \(\Q(\sqrt{6}, \sqrt{-278})\).
Endomorphism algebra over $\overline{\F}_{83}$
The base change of $A$ to $\F_{83^{2}}$ is 1.6889.ei 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-417}) \)$)$

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_aei$4$(not in LMFDB)