Invariants
Base field: | $\F_{2^{3}}$ |
Dimension: | $2$ |
L-polynomial: | $1 - 2 x + 11 x^{2} - 16 x^{3} + 64 x^{4}$ |
Frobenius angles: | $\pm0.291254019065$, $\pm0.582482426060$ |
Angle rank: | $2$ (numerical) |
Number field: | 4.0.346176.4 |
Galois group: | $D_{4}$ |
Jacobians: | $6$ |
Isomorphism classes: | 6 |
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: | $2$ |
Slopes: | $[0, 0, 1, 1]$ |
Point counts
Point counts of the abelian variety
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $58$ | $5452$ | $266974$ | $16966624$ | $1086866698$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $7$ | $83$ | $523$ | $4143$ | $33167$ | $261443$ | $2091467$ | $16776991$ | $134243119$ | $1073749043$ |
Jacobians and polarizations
This isogeny class contains the Jacobians of 6 curves (of which all are hyperelliptic), and hence is principally polarizable:
- $y^2+(x^2+x+a^2+a+1)y=(a+1)x^5+a^2x+a$
- $y^2+(x^2+x+a^2+1)y=(a^2+a+1)x^5+ax+a^2+a$
- $y^2+(x^2+x+a+1)y=(a^2+1)x^5+(a^2+a)x+a^2$
- $y^2+(x^2+x+a^2+a+1)y=(a^2+a+1)x^5+x^4+ax^3+x^2+x+a^2+1$
- $y^2+(x^2+x+a+1)y=(a+1)x^5+x^4+a^2x^3+x^2+x+a^2+a+1$
- $y^2+(x^2+x+a^2+1)y=(a^2+1)x^5+x^4+(a^2+a)x^3+x^2+x+a+1$
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{2^{3}}$.
Endomorphism algebra over $\F_{2^{3}}$The endomorphism algebra of this simple isogeny class is 4.0.346176.4. |
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 |
---|---|---|
2.8.c_l | $2$ | 2.64.s_hd |