Properties

Label 2.73.a_cw
Base field $\F_{73}$
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:  $\F_{73}$
Dimension:  $2$
L-polynomial:  $1 + 74 x^{2} + 5329 x^{4}$
Frobenius angles:  $\pm0.334594975400$, $\pm0.665405024600$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{2}, \sqrt{-55})\)
Galois group:  $C_2^2$
Jacobians:  $522$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5404$ $29203216$ $151333448476$ $806754494923776$ $4297625831632719964$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $74$ $5478$ $389018$ $28408606$ $2073071594$ $151332670662$ $11047398519098$ $806460151780798$ $58871586708267914$ $4297625833561882278$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 522 curves (of which all are hyperelliptic):

  • $y^2=71 x^6+20 x^5+17 x^4+12 x^2+11 x+42$
  • $y^2=25 x^6+71 x^5+14 x^4+28 x^3+32 x^2+23 x+68$
  • $y^2=52 x^6+63 x^5+70 x^4+67 x^3+14 x^2+42 x+48$
  • $y^2=9 x^6+2 x^5+28 x^4+52 x^3+61 x^2+50 x+47$
  • $y^2=45 x^6+10 x^5+67 x^4+41 x^3+13 x^2+31 x+16$
  • $y^2=4 x^6+25 x^5+60 x^4+46 x^3+37 x^2+67 x+1$
  • $y^2=20 x^6+52 x^5+8 x^4+11 x^3+39 x^2+43 x+5$
  • $y^2=30 x^5+44 x^4+67 x^3+12 x^2+4 x+2$
  • $y^2=4 x^5+x^4+43 x^3+60 x^2+20 x+10$
  • $y^2=66 x^6+36 x^5+43 x^4+37 x^3+18 x^2+48 x+64$
  • $y^2=56 x^6+60 x^5+64 x^4+33 x^3+18 x^2+43 x+34$
  • $y^2=61 x^6+8 x^5+28 x^4+19 x^3+17 x^2+69 x+24$
  • $y^2=22 x^6+34 x^5+2 x^3+68 x^2+60 x+52$
  • $y^2=8 x^6+72 x^5+22 x^4+16 x^3+42 x^2+7 x+18$
  • $y^2=40 x^6+68 x^5+37 x^4+7 x^3+64 x^2+35 x+17$
  • $y^2=32 x^6+70 x^5+67 x^4+32 x^3+34 x^2+34 x+62$
  • $y^2=14 x^6+58 x^5+43 x^4+14 x^3+24 x^2+24 x+18$
  • $y^2=41 x^6+52 x^5+52 x^4+18 x^3+43 x^2+71 x+44$
  • $y^2=59 x^6+41 x^5+41 x^4+17 x^3+69 x^2+63 x+1$
  • $y^2=47 x^6+71 x^5+72 x^4+33 x^3+2 x^2+58 x+18$
  • and 502 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{73^{2}}$.

Endomorphism algebra over $\F_{73}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{2}, \sqrt{-55})\).
Endomorphism algebra over $\overline{\F}_{73}$
The base change of $A$ to $\F_{73^{2}}$ is 1.5329.cw 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-110}) \)$)$

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.a_acw$4$(not in LMFDB)
2.73.am_cu$8$(not in LMFDB)
2.73.m_cu$8$(not in LMFDB)