Invariants
| Base field: | $\F_{97}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - x - 17 x^{2} - 97 x^{3} + 9409 x^{4}$ |
| Frobenius angles: | $\pm0.223598462506$, $\pm0.752432998049$ |
| Angle rank: | $2$ (numerical) |
| Number field: | \(\Q(\sqrt{-706 +26 \sqrt{5}})\) |
| Galois group: | $D_{4}$ |
| Jacobians: | $285$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $13$ |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $9295$ | $88218845$ | $832659494095$ | $7840674366335525$ | $73742728559904118000$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $97$ | $9375$ | $912331$ | $88565883$ | $8587377042$ | $832972959975$ | $80798292836071$ | $7837433278159923$ | $760231058226972157$ | $73742412675514246750$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 285 curves (of which all are hyperelliptic):
- $y^2=68 x^6+79 x^5+68 x^4+24 x^3+43 x^2+18 x+15$
- $y^2=6 x^6+52 x^5+15 x^4+42 x^3+84 x+43$
- $y^2=87 x^6+96 x^5+13 x^4+39 x^3+50 x^2+55 x+90$
- $y^2=37 x^6+66 x^5+9 x^4+92 x^3+17 x^2+88 x+78$
- $y^2=60 x^6+70 x^5+45 x^4+78 x^3+x^2+20 x+85$
- $y^2=96 x^6+6 x^4+59 x^3+x^2+25 x+92$
- $y^2=29 x^6+73 x^5+78 x^4+16 x^3+85 x^2+47 x+27$
- $y^2=25 x^6+73 x^5+4 x^4+25 x^3+5 x^2+48 x+30$
- $y^2=41 x^6+42 x^5+57 x^4+3 x^3+37 x^2+8 x+11$
- $y^2=14 x^6+94 x^5+50 x^4+44 x^3+50 x^2+72 x+12$
- $y^2=58 x^6+82 x^5+86 x^4+20 x^3+95 x^2+68 x+19$
- $y^2=26 x^6+9 x^5+14 x^4+2 x^3+65 x^2+65 x+20$
- $y^2=38 x^6+57 x^5+10 x^4+25 x^3+38 x^2+46 x+93$
- $y^2=55 x^6+48 x^5+59 x^4+81 x^3+26 x^2+21 x+92$
- $y^2=69 x^6+35 x^5+6 x^4+81 x^3+64 x^2+26 x+50$
- $y^2=46 x^6+62 x^5+40 x^4+48 x^3+34 x^2+48 x+20$
- $y^2=46 x^6+16 x^5+92 x^4+90 x^3+31 x^2+62 x+51$
- $y^2=63 x^6+94 x^5+36 x^4+90 x^3+17 x^2+38 x+51$
- $y^2=65 x^6+84 x^5+21 x^4+24 x^3+9 x^2+7 x+77$
- $y^2=86 x^6+66 x^5+87 x^4+8 x^3+73 x^2+24 x+43$
- and 265 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{97}$.
Endomorphism algebra over $\F_{97}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-706 +26 \sqrt{5}})\). |
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 |
|---|---|---|
| 2.97.b_ar | $2$ | (not in LMFDB) |