Invariants
| Base field: | $\F_{73}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - 8 x + 142 x^{2} - 584 x^{3} + 5329 x^{4}$ |
| Frobenius angles: | $\pm0.334877010546$, $\pm0.508795915501$ |
| Angle rank: | $2$ (numerical) |
| Number field: | \(\Q(\sqrt{-16 + \sqrt{5}})\) |
| Galois group: | $D_{4}$ |
| Jacobians: | $234$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $4880$ | $29592320$ | $151779912080$ | $806305494118400$ | $4297553507933082000$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $66$ | $5550$ | $390162$ | $28392798$ | $2073036706$ | $151334215950$ | $11047394114802$ | $806460066764478$ | $58871587312520706$ | $4297625835588976750$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 234 curves (of which all are hyperelliptic):
- $y^2=62 x^6+67 x^5+41 x^4+71 x^3+14 x^2+53 x+47$
- $y^2=21 x^6+45 x^5+42 x^4+71 x^3+50 x^2+16 x+14$
- $y^2=50 x^6+6 x^5+25 x^4+40 x^3+59 x^2+7 x+71$
- $y^2=19 x^6+35 x^5+24 x^4+60 x^3+34 x^2+61 x+32$
- $y^2=26 x^6+18 x^5+42 x^4+2 x^3+31 x^2+49 x+8$
- $y^2=27 x^6+66 x^5+69 x^4+65 x^3+31 x^2+46 x+53$
- $y^2=52 x^6+31 x^5+13 x^4+55 x^3+30 x^2+48 x+5$
- $y^2=40 x^6+11 x^5+64 x^4+54 x^3+48 x^2+25 x+28$
- $y^2=22 x^6+20 x^5+43 x^4+57 x^3+4 x^2+14 x+12$
- $y^2=5 x^6+20 x^5+27 x^4+22 x^3+49 x^2+17 x+14$
- $y^2=50 x^6+34 x^5+36 x^4+52 x^3+72 x^2+12 x+49$
- $y^2=50 x^6+45 x^5+30 x^4+52 x^3+47 x^2+54 x+50$
- $y^2=28 x^6+47 x^5+62 x^4+62 x^3+11 x+5$
- $y^2=67 x^6+43 x^5+29 x^4+37 x^3+16 x^2+52 x+18$
- $y^2=58 x^6+50 x^5+59 x^4+14 x^3+68 x^2+59 x+1$
- $y^2=50 x^6+31 x^5+62 x^4+51 x^3+12 x^2+43 x+23$
- $y^2=47 x^6+14 x^5+7 x^4+20 x^3+35 x^2+41 x+13$
- $y^2=67 x^6+57 x^5+8 x^4+70 x^3+58 x^2+43 x+26$
- $y^2=46 x^6+32 x^5+51 x^4+28 x^3+33 x^2+38 x+44$
- $y^2=12 x^6+12 x^5+9 x^4+10 x^3+4 x^2+22 x+25$
- and 214 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 \(\Q(\sqrt{-16 + \sqrt{5}})\). |
Base change
This is a primitive isogeny class.
Twists
Below is a list of all twists of this isogeny class.
| Twist | Extension degree | Common base change |
|---|---|---|
| 2.73.i_fm | $2$ | (not in LMFDB) |