Invariants
| Base field: | $\F_{23}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 6 x + 52 x^{2} + 138 x^{3} + 529 x^{4}$ |
| Frobenius angles: | $\pm0.542201814829$, $\pm0.664227958897$ |
| Angle rank: | $2$ (numerical) |
| Number field: | \(\Q(\sqrt{-8 -2 \sqrt{3}})\) |
| Galois group: | $D_{4}$ |
| Jacobians: | $26$ |
| Isomorphism classes: | 26 |
| Cyclic group of points: | no |
| Non-cyclic primes: | $11$ |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $726$ | $317988$ | $144355662$ | $78195793104$ | $41464030668126$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $30$ | $598$ | $11862$ | $279430$ | $6442170$ | $148028614$ | $3404784882$ | $78311020990$ | $1801152478782$ | $41426519900038$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 26 curves (of which all are hyperelliptic):
- $y^2=10 x^6+14 x^5+7 x^4+3 x^3+19 x^2+6 x+5$
- $y^2=x^5+x^4+15 x^3+2 x^2+17 x+19$
- $y^2=9 x^6+9 x^5+19 x^4+3 x^3+7 x^2+9 x+17$
- $y^2=7 x^6+22 x^5+21 x^4+15 x^3+x^2+x+16$
- $y^2=13 x^6+20 x^5+7 x^4+15 x^3+21 x^2+11 x+19$
- $y^2=13 x^6+19 x^5+9 x^4+11 x^3+x^2+15 x+22$
- $y^2=17 x^6+12 x^5+16 x^4+9 x^3+5 x^2+2 x+9$
- $y^2=11 x^6+16 x^5+3 x^4+4 x^3+8 x^2+7 x+13$
- $y^2=17 x^6+x^5+17 x^4+9 x^3+8 x+4$
- $y^2=8 x^6+17 x^5+11 x^4+9 x^3+x^2+5 x+13$
- $y^2=2 x^6+4 x^5+12 x^4+13 x^3+9 x^2+7$
- $y^2=16 x^6+21 x^5+19 x^4+10 x^3+6 x^2+7 x+14$
- $y^2=9 x^6+18 x^5+7 x^4+2 x^3+13 x^2+11 x+15$
- $y^2=13 x^6+19 x^5+21 x^3+2 x^2+4 x+14$
- $y^2=10 x^6+14 x^5+6 x^4+x^2+19 x+11$
- $y^2=17 x^6+16 x^5+10 x^4+20 x^3+6 x^2+18 x+16$
- $y^2=x^6+x^5+14 x^4+10 x^3+x^2+16 x+15$
- $y^2=13 x^6+19 x^5+13 x^4+14 x^3+15 x^2+18 x+3$
- $y^2=10 x^6+9 x^5+22 x^4+6 x^3+19 x^2+11 x+21$
- $y^2=6 x^6+7 x^5+14 x^4+7 x^3+12 x^2+2 x+2$
- $y^2=2 x^5+17 x^4+16 x^2+14 x+21$
- $y^2=18 x^6+16 x^5+14 x^4+5 x^3+6 x^2+14 x+21$
- $y^2=15 x^6+17 x^5+9 x^4+8 x^3+8 x^2+6 x+12$
- $y^2=9 x^6+x^5+10 x^3+10 x^2+x+10$
- $y^2=7 x^6+18 x^5+9 x^3+4 x^2+12 x+9$
- $y^2=12 x^6+16 x^5+6 x^4+12 x^3+2 x^2+15 x+9$
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{23}$.
Endomorphism algebra over $\F_{23}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-8 -2 \sqrt{3}})\). |
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 |
|---|---|---|
| 2.23.ag_ca | $2$ | (not in LMFDB) |