Invariants
Base field: | $\F_{2^{3}}$ |
Dimension: | $2$ |
L-polynomial: | $1 - 4 x + 13 x^{2} - 32 x^{3} + 64 x^{4}$ |
Frobenius angles: | $\pm0.193271217563$, $\pm0.536415660845$ |
Angle rank: | $2$ (numerical) |
Number field: | 4.0.257936.1 |
Galois group: | $D_{4}$ |
Jacobians: | $12$ |
Isomorphism classes: | 12 |
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
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $42$ | $4788$ | $260946$ | $16700544$ | $1092097482$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $5$ | $75$ | $509$ | $4079$ | $33325$ | $263835$ | $2096365$ | $16771039$ | $134221757$ | $1073704875$ |
Jacobians and polarizations
This isogeny class contains the Jacobians of 12 curves (of which all are hyperelliptic), and hence is principally polarizable:
- $y^2+(x^2+x+a^2+a+1)y=x^5+(a+1)x^3+a^2x+a^2+1$
- $y^2+(x^2+x+a^2+1)y=x^5+(a^2+a+1)x^3+ax+a+1$
- $y^2+(x^2+x+a+1)y=x^5+(a^2+1)x^3+(a^2+a)x+a^2+a+1$
- $y^2+(x^2+x+a+1)y=(a+1)x^5+x^3+a^2+a$
- $y^2+(x^2+x+1)y=(a^2+1)x^5+x^4+(a^2+a+1)x^3+x^2+(a^2+1)x+a+1$
- $y^2+(x^2+x+a^2+1)y=(a^2+1)x^5+x^3+a$
- $y^2+(x^2+x+1)y=(a^2+a+1)x^5+x^4+(a+1)x^3+x^2+(a^2+a+1)x+a^2+1$
- $y^2+(x^2+x+a+1)y=(a^2+1)x^5+(a+1)x^3+1$
- $y^2+(x^2+x+a^2+a+1)y=(a^2+a+1)x^5+x^3+a^2$
- $y^2+(x^2+x+1)y=(a+1)x^5+x^4+(a^2+1)x^3+x^2+(a+1)x+a^2+a+1$
- $y^2+(x^2+x+a^2+a+1)y=(a+1)x^5+(a^2+a+1)x^3+1$
- $y^2+(x^2+x+a^2+1)y=(a^2+a+1)x^5+(a^2+1)x^3+1$
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 4.0.257936.1. |
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.e_n | $2$ | 2.64.k_bp |