Properties

Label 2.59.a_bm
Base field $\F_{59}$
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:  $\F_{59}$
Dimension:  $2$
L-polynomial:  $1 + 38 x^{2} + 3481 x^{4}$
Frobenius angles:  $\pm0.302183253101$, $\pm0.697816746899$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{5}, \sqrt{-39})\)
Galois group:  $C_2^2$
Jacobians:  $596$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $3520$ $12390400$ $42180191680$ $146964219494400$ $511116754727128000$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $60$ $3558$ $205380$ $12128398$ $714924300$ $42179849718$ $2488651484820$ $146830425177118$ $8662995818654940$ $511116756153614598$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 596 curves (of which all are hyperelliptic):

  • $y^2=44 x^5+6 x^4+41 x^3+52 x^2+2 x+11$
  • $y^2=29 x^5+12 x^4+23 x^3+45 x^2+4 x+22$
  • $y^2=14 x^6+43 x^5+29 x^4+13 x^3+53 x^2+13 x+52$
  • $y^2=19 x^6+6 x^5+35 x^4+44 x^3+19 x^2+47$
  • $y^2=38 x^6+12 x^5+11 x^4+29 x^3+38 x^2+35$
  • $y^2=13 x^6+57 x^5+52 x^4+52 x^3+30 x^2+33 x+49$
  • $y^2=26 x^6+55 x^5+45 x^4+45 x^3+x^2+7 x+39$
  • $y^2=33 x^6+27 x^5+2 x^3+15 x^2+23 x+6$
  • $y^2=45 x^6+18 x^5+7 x^4+54 x^3+47 x^2+22 x+37$
  • $y^2=31 x^6+36 x^5+14 x^4+49 x^3+35 x^2+44 x+15$
  • $y^2=22 x^5+30 x^4+2 x^3+21 x^2+45 x$
  • $y^2=19 x^6+25 x^5+22 x^4+54 x^3+3 x^2+44 x+7$
  • $y^2=38 x^6+50 x^5+44 x^4+49 x^3+6 x^2+29 x+14$
  • $y^2=15 x^6+37 x^5+53 x^4+35 x^3+4 x^2+57 x+40$
  • $y^2=30 x^6+15 x^5+47 x^4+11 x^3+8 x^2+55 x+21$
  • $y^2=48 x^6+4 x^5+54 x^4+37 x^3+2 x^2+47 x+28$
  • $y^2=34 x^6+27 x^5+45 x^4+54 x^3+13 x^2+29 x+51$
  • $y^2=2 x^6+57 x^5+53 x^4+37 x^3+36 x^2+35 x+18$
  • $y^2=55 x^6+40 x^5+9 x^4+57 x^3+58 x^2+11 x+14$
  • $y^2=51 x^6+21 x^5+18 x^4+55 x^3+57 x^2+22 x+28$
  • and 576 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{59^{2}}$.

Endomorphism algebra over $\F_{59}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{5}, \sqrt{-39})\).
Endomorphism algebra over $\overline{\F}_{59}$
The base change of $A$ to $\F_{59^{2}}$ is 1.3481.bm 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
2.59.a_abm$4$(not in LMFDB)