Invariants
Base field: | $\F_{397}$ |
Dimension: | $1$ |
L-polynomial: | $1 - 19 x + 397 x^{2}$ |
Frobenius angles: | $\pm0.341799734852$ |
Angle rank: | $1$ (numerical) |
Number field: | \(\Q(\sqrt{-1227}) \) |
Galois group: | $C_2$ |
Jacobians: | $4$ |
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: | $1$ |
Slopes: | $[0, 1]$ |
Point counts
Point counts of the abelian variety
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $379$ | $158043$ | $62586544$ | $24840724611$ | $9861713127919$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $379$ | $158043$ | $62586544$ | $24840724611$ | $9861713127919$ | $3915101510266176$ | $1554295347800117371$ | $617055253437713424483$ | $244970935602487394242288$ | $97253461433810740112972643$ |
Jacobians and polarizations
This isogeny class contains the Jacobians of 4 curves (of which all are hyperelliptic), and hence is principally polarizable:
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{397}$.
Endomorphism algebra over $\F_{397}$The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-1227}) \). |
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 |
---|---|---|
1.397.t | $2$ | (not in LMFDB) |