Properties

Label 2.73.u_ja
Base field $\F_{73}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple yes
Geometrically simple yes
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{73}$
Dimension:  $2$
L-polynomial:  $1 + 20 x + 234 x^{2} + 1460 x^{3} + 5329 x^{4}$
Frobenius angles:  $\pm0.624931471405$, $\pm0.788845564183$
Angle rank:  $2$ (numerical)
Number field:  \(\Q(\sqrt{-120 -50 \sqrt{3}})\)
Galois group:  $D_{4}$
Jacobians:  $112$
Isomorphism classes:  144
Cyclic group of points:    no
Non-cyclic primes:   $2$

This isogeny class is simple and 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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $7044$ $28767696$ $150689819556$ $806727205671936$ $4297614424408796964$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $94$ $5398$ $387358$ $28407646$ $2073066094$ $151334196982$ $11047395508558$ $806460116879038$ $58871586985134334$ $4297625822871320278$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 112 curves (of which all are hyperelliptic):

  • $y^2=16 x^6+70 x^5+25 x^4+19 x^3+34 x^2+65 x+7$
  • $y^2=31 x^6+38 x^5+52 x^4+45 x^3+56 x^2+23 x+12$
  • $y^2=43 x^6+69 x^5+24 x^4+61 x^3+20 x^2+14 x+55$
  • $y^2=62 x^6+31 x^5+55 x^4+69 x^3+18 x^2+23 x+64$
  • $y^2=30 x^6+58 x^5+61 x^4+3 x^3+53 x^2+65 x+49$
  • $y^2=3 x^6+3 x^5+49 x^4+55 x^3+5 x^2+19 x+50$
  • $y^2=32 x^6+8 x^5+21 x^4+45 x^3+53 x^2+44 x+12$
  • $y^2=42 x^6+13 x^5+57 x^4+70 x^3+22 x^2+69 x+35$
  • $y^2=48 x^6+33 x^5+69 x^4+40 x^3+56 x^2+54 x+61$
  • $y^2=33 x^6+2 x^5+19 x^4+30 x^3+31 x^2+69 x+35$
  • $y^2=63 x^6+4 x^5+40 x^4+24 x^3+72 x^2+71 x+3$
  • $y^2=55 x^6+13 x^5+53 x^4+14 x^3+3 x^2+58 x+54$
  • $y^2=29 x^6+22 x^5+51 x^4+35 x^3+29 x^2+35 x+6$
  • $y^2=41 x^6+6 x^5+37 x^4+40 x^3+18 x^2+26 x+27$
  • $y^2=22 x^6+12 x^5+30 x^4+62 x^3+37 x^2+70 x+10$
  • $y^2=11 x^6+22 x^5+26 x^4+63 x^3+70 x^2+3 x+70$
  • $y^2=23 x^6+70 x^5+60 x^4+x^3+17 x^2+72 x+46$
  • $y^2=48 x^6+6 x^5+61 x^4+37 x^3+57 x^2+24 x+56$
  • $y^2=19 x^6+24 x^5+14 x^3+40 x^2+19 x+60$
  • $y^2=66 x^6+70 x^5+42 x^4+24 x^2+39 x+62$
  • and 92 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{73}$.

Endomorphism algebra over $\F_{73}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-120 -50 \sqrt{3}})\).

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.73.au_ja$2$(not in LMFDB)