Invariants
Base field: | $\F_{397}$ |
Dimension: | $1$ |
L-polynomial: | $1 - 32 x + 397 x^{2}$ |
Frobenius angles: | $\pm0.203226797963$ |
Angle rank: | $1$ (numerical) |
Number field: | \(\Q(\sqrt{-141}) \) |
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
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $366$ | $157380$ | $62576118$ | $24840859200$ | $9861723234366$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $366$ | $157380$ | $62576118$ | $24840859200$ | $9861723234366$ | $3915101730400740$ | $1554295349225996358$ | $617055253385217388800$ | $244970935600675211594766$ | $97253461433786092823328900$ |
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 $\F_{397}$.
Endomorphism algebra over $\F_{397}$The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-141}) \). |
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.bg | $2$ | (not in LMFDB) |