Invariants
Base field: | $\F_{421}$ |
Dimension: | $1$ |
L-polynomial: | $1 - 23 x + 421 x^{2}$ |
Frobenius angles: | $\pm0.310618320312$ |
Angle rank: | $1$ (numerical) |
Number field: | \(\Q(\sqrt{-1155}) \) |
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
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $399$ | $177555$ | $74635344$ | $31414628595$ | $13225449438579$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $399$ | $177555$ | $74635344$ | $31414628595$ | $13225449438579$ | $5567914586243520$ | $2344092095351359479$ | $986862773240542095555$ | $415469227536550941811344$ | $174912544792478351135998875$ |
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 $\F_{421}$.
Endomorphism algebra over $\F_{421}$The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-1155}) \). |
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 |
---|---|---|
1.421.x | $2$ | (not in LMFDB) |