Invariants
Base field: | $\F_{2^{7}}$ |
Dimension: | $1$ |
L-polynomial: | $1 - 11 x + 128 x^{2}$ |
Frobenius angles: | $\pm0.338405993823$ |
Angle rank: | $1$ (numerical) |
Number field: | \(\Q(\sqrt{-391}) \) |
Galois group: | $C_2$ |
Jacobians: | $14$ |
Isomorphism classes: | 14 |
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
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $118$ | $16520$ | $2100046$ | $268450000$ | $34359528038$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $118$ | $16520$ | $2100046$ | $268450000$ | $34359528038$ | $4398042335960$ | $562949934417086$ | $72057594363300000$ | $9223372042866409558$ | $1180591620741891650600$ |
Jacobians and polarizations
This isogeny class contains the Jacobians of 14 curves (of which all are hyperelliptic), and hence is principally polarizable:
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{2^{7}}$.
Endomorphism algebra over $\F_{2^{7}}$The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-391}) \). |
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 |
---|---|---|
1.128.l | $2$ | (not in LMFDB) |