Properties

Label 2.83.a_adm
Base field $\F_{83}$
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:  $\F_{83}$
Dimension:  $2$
L-polynomial:  $( 1 - 16 x + 83 x^{2} )( 1 + 16 x + 83 x^{2} )$
  $1 - 90 x^{2} + 6889 x^{4}$
Frobenius angles:  $\pm0.158801688027$, $\pm0.841198311973$
Angle rank:  $1$ (numerical)
Jacobians:  $329$
Cyclic group of points:    no
Non-cyclic primes:   $2$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6800$ $46240000$ $326941504400$ $2252831296000000$ $15516041185055114000$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $84$ $6710$ $571788$ $47469678$ $3939040644$ $326942635430$ $27136050989628$ $2252292357492958$ $186940255267540404$ $15516041182904374550$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 329 curves (of which all are hyperelliptic):

  • $y^2=81 x^6+48 x^5+21 x^4+17 x^3+35 x^2+35 x+50$
  • $y^2=5 x^6+25 x^5+18 x^4+38 x^3+73 x^2+69 x+73$
  • $y^2=10 x^6+50 x^5+36 x^4+76 x^3+63 x^2+55 x+63$
  • $y^2=26 x^6+60 x^5+41 x^4+15 x^3+18 x^2+72 x+72$
  • $y^2=45 x^6+45 x^5+5 x^4+39 x^3+35 x^2+57 x+80$
  • $y^2=7 x^6+7 x^5+10 x^4+78 x^3+70 x^2+31 x+77$
  • $y^2=56 x^6+57 x^5+59 x^4+30 x^3+15 x^2+17 x+41$
  • $y^2=29 x^6+31 x^5+35 x^4+60 x^3+30 x^2+34 x+82$
  • $y^2=56 x^6+51 x^5+11 x^4+13 x^3+14 x^2+26 x+22$
  • $y^2=29 x^6+19 x^5+22 x^4+26 x^3+28 x^2+52 x+44$
  • $y^2=66 x^6+46 x^5+65 x^4+18 x^3+64 x^2+20 x+76$
  • $y^2=49 x^6+9 x^5+47 x^4+36 x^3+45 x^2+40 x+69$
  • $y^2=57 x^6+32 x^5+4 x^4+50 x^3+69 x+72$
  • $y^2=31 x^6+64 x^5+8 x^4+17 x^3+55 x+61$
  • $y^2=49 x^6+30 x^5+5 x^4+46 x^3+6 x^2+3 x+18$
  • $y^2=15 x^6+60 x^5+10 x^4+9 x^3+12 x^2+6 x+36$
  • $y^2=43 x^6+28 x^5+39 x^4+69 x^3+50 x^2+40 x+66$
  • $y^2=48 x^6+19 x^5+18 x^4+4 x^3+77 x^2+54 x+26$
  • $y^2=66 x^6+28 x^5+22 x^4+72 x^3+39 x^2+35 x+20$
  • $y^2=49 x^6+56 x^5+44 x^4+61 x^3+78 x^2+70 x+40$
  • and 309 more

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{83}$
The isogeny class factors as 1.83.aq $\times$ 1.83.q 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 $\overline{\F}_{83}$
The base change of $A$ to $\F_{83^{2}}$ is 1.6889.adm 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-19}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.83.abg_qg$2$(not in LMFDB)
2.83.bg_qg$2$(not in LMFDB)
2.83.a_dm$4$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.83.abg_qg$2$(not in LMFDB)
2.83.bg_qg$2$(not in LMFDB)
2.83.a_dm$4$(not in LMFDB)
2.83.aq_gr$6$(not in LMFDB)
2.83.q_gr$6$(not in LMFDB)