Invariants
| Base field: | $\F_{97}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - 66 x^{2} + 9409 x^{4}$ |
| Frobenius angles: | $\pm0.194751565270$, $\pm0.805248434730$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{-2}, \sqrt{65})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $368$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $9344$ | $87310336$ | $832973580416$ | $7839994601537536$ | $73742412672551080064$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $98$ | $9278$ | $912674$ | $88558206$ | $8587340258$ | $832975155902$ | $80798284478114$ | $7837433530195198$ | $760231058654565218$ | $73742412655609334078$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 368 curves (of which all are hyperelliptic):
- $y^2=19 x^6+53 x^5+22 x^4+88 x^3+16 x^2+76 x+95$
- $y^2=95 x^6+71 x^5+13 x^4+52 x^3+80 x^2+89 x+87$
- $y^2=51 x^6+11 x^5+19 x^4+61 x^3+64 x^2+73 x+47$
- $y^2=61 x^6+55 x^5+95 x^4+14 x^3+29 x^2+74 x+41$
- $y^2=66 x^6+81 x^5+75 x^4+69 x^3+29 x^2+64 x+35$
- $y^2=39 x^6+17 x^5+84 x^4+54 x^3+48 x^2+29 x+78$
- $y^2=5 x^6+60 x^5+79 x^4+82 x^3+39 x^2+26 x+84$
- $y^2=25 x^6+9 x^5+7 x^4+22 x^3+x^2+33 x+32$
- $y^2=10 x^6+45 x^5+96 x^4+38 x^3+41 x^2+14 x+25$
- $y^2=50 x^6+31 x^5+92 x^4+93 x^3+11 x^2+70 x+28$
- $y^2=89 x^6+23 x^5+40 x^4+77 x^3+92 x^2+15 x+29$
- $y^2=57 x^6+18 x^5+6 x^4+94 x^3+72 x^2+75 x+48$
- $y^2=45 x^6+3 x^5+55 x^4+11 x^3+71 x^2+57 x+18$
- $y^2=31 x^6+15 x^5+81 x^4+55 x^3+64 x^2+91 x+90$
- $y^2=38 x^6+83 x^5+4 x^4+89 x^3+66 x^2+12 x+73$
- $y^2=93 x^6+27 x^5+20 x^4+57 x^3+39 x^2+60 x+74$
- $y^2=93 x^6+23 x^5+67 x^4+28 x^3+94 x^2+45 x+59$
- $y^2=16 x^6+46 x^5+45 x^4+39 x^3+74 x^2+58 x+4$
- $y^2=80 x^6+36 x^5+31 x^4+x^3+79 x^2+96 x+20$
- $y^2=48 x^6+62 x^5+26 x^4+69 x^3+87 x^2+26 x+27$
- and 348 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{97^{2}}$.
Endomorphism algebra over $\F_{97}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-2}, \sqrt{65})\). |
| The base change of $A$ to $\F_{97^{2}}$ is 1.9409.aco 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-130}) \)$)$ |
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.a_co | $4$ | (not in LMFDB) |
| 2.97.aq_ey | $8$ | (not in LMFDB) |
| 2.97.q_ey | $8$ | (not in LMFDB) |