Invariants
Base field: | $\F_{19^{2}}$ |
Dimension: | $1$ |
L-polynomial: | $1 - 23 x + 361 x^{2}$ |
Frobenius angles: | $\pm0.293067883912$ |
Angle rank: | $1$ (numerical) |
Number field: | \(\Q(\sqrt{-915}) \) |
Galois group: | $C_2$ |
Jacobians: | $8$ |
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
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $339$ | $130515$ | $47058624$ | $16983786435$ | $6131066795979$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $339$ | $130515$ | $47058624$ | $16983786435$ | $6131066795979$ | $2213314850799360$ | $799006684018465779$ | $288441413551683861315$ | $104127350298181638508224$ | $37589973457557930691387875$ |
Jacobians and polarizations
This isogeny class contains the Jacobians of 8 curves (of which all are hyperelliptic), and hence is principally polarizable:
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{19^{2}}$.
Endomorphism algebra over $\F_{19^{2}}$The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-915}) \). |
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 |
---|---|---|
1.361.x | $2$ | (not in LMFDB) |