Invariants
| Base field: | $\F_{97}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - x + 28 x^{2} - 97 x^{3} + 9409 x^{4}$ |
| Frobenius angles: | $\pm0.261994078676$, $\pm0.716617240495$ |
| Angle rank: | $2$ (numerical) |
| Number field: | \(\Q(\sqrt{-886 +2 \sqrt{665}})\) |
| Galois group: | $D_{4}$ |
| Jacobians: | $300$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $9340$ | $89066240$ | $832781448640$ | $7840602642713600$ | $73742896675593833500$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $97$ | $9465$ | $912466$ | $88565073$ | $8587396617$ | $832970521470$ | $80798286845401$ | $7837433306990433$ | $760231057626717202$ | $73742412710699302825$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 300 curves (of which all are hyperelliptic):
- $y^2=8 x^6+4 x^5+47 x^4+24 x^3+12 x^2+8 x+1$
- $y^2=68 x^6+55 x^5+45 x^4+15 x^3+35 x^2+65 x+58$
- $y^2=32 x^6+49 x^5+68 x^4+48 x^3+77 x^2+32 x+71$
- $y^2=20 x^6+43 x^5+47 x^4+38 x^3+80 x^2+12 x+39$
- $y^2=31 x^6+28 x^5+54 x^4+61 x^3+50 x^2+93 x+7$
- $y^2=39 x^6+94 x^5+39 x^4+7 x^3+35 x^2+91 x+2$
- $y^2=15 x^6+5 x^5+93 x^4+61 x^3+44 x^2+20 x+54$
- $y^2=87 x^6+79 x^5+38 x^4+7 x^3+25 x^2+57 x+24$
- $y^2=54 x^6+44 x^5+21 x^4+93 x^3+24 x^2+92 x+19$
- $y^2=66 x^6+30 x^5+90 x^4+52 x^3+47 x^2+22 x+78$
- $y^2=81 x^6+11 x^5+22 x^4+91 x^3+11 x^2+77 x+52$
- $y^2=6 x^5+73 x^4+59 x^3+64 x^2+44 x+37$
- $y^2=39 x^6+50 x^5+16 x^4+44 x^3+42 x^2+2 x+4$
- $y^2=31 x^6+96 x^5+84 x^4+86 x^3+68 x^2+83 x+39$
- $y^2=69 x^6+64 x^5+38 x^4+57 x^3+54 x^2+95 x+4$
- $y^2=7 x^6+81 x^5+88 x^4+24 x^3+x^2+4 x+33$
- $y^2=87 x^6+16 x^5+64 x^4+61 x^3+38 x^2+68 x+49$
- $y^2=10 x^6+53 x^5+55 x^4+23 x^3+31 x^2+40 x+56$
- $y^2=79 x^6+34 x^5+15 x^4+38 x^3+50 x^2+94 x+31$
- $y^2=56 x^6+44 x^5+3 x^4+76 x^3+81 x^2+12 x+72$
- and 280 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 \(\Q(\sqrt{-886 +2 \sqrt{665}})\). |
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_bc | $2$ | (not in LMFDB) |