Invariants
Base field: | $\F_{3^{3}}$ |
Dimension: | $2$ |
L-polynomial: | $1 - 12 x + 80 x^{2} - 324 x^{3} + 729 x^{4}$ |
Frobenius angles: | $\pm0.156439426947$, $\pm0.411964257122$ |
Angle rank: | $2$ (numerical) |
Number field: | 4.0.3846400.2 |
Galois group: | $D_{4}$ |
Jacobians: | $36$ |
Isomorphism classes: | 72 |
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
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $474$ | $543204$ | $390997386$ | $282381340176$ | $205868560616634$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $16$ | $746$ | $19864$ | $531350$ | $14347336$ | $387455642$ | $10460739760$ | $282430920734$ | $7625595706768$ | $205891099634186$ |
Jacobians and polarizations
This isogeny class contains the Jacobians of 36 curves (of which all are hyperelliptic), and hence is principally polarizable:
- $y^2=(2a^2+2a+2)x^6+(2a^2+a)x^5+(a^2+a)x^4+(2a^2+a+1)x^3+(2a^2+2a+1)x^2+(2a^2+2a+1)x+2a^2+a+1$
- $y^2=(a^2+1)x^6+(a^2+a+1)x^4+(a^2+2a)x^3+(2a^2+1)x^2+(a^2+2a+2)x+a^2+1$
- $y^2=(2a^2+1)x^6+(2a+1)x^5+(2a^2+a+1)x^4+ax^3+(a^2+a+1)x^2+(2a^2+2a+1)x+2$
- $y^2=(a^2+a+2)x^6+(a^2+a)x^5+(2a+2)x^4+(a^2+2)x^3+(2a^2+2a+1)x^2+(a^2+1)x+2a^2+a$
- $y^2=(2a^2+a+2)x^6+(2a^2+a+1)x^5+(a+1)x^4+(a+1)x^3+(2a^2+1)x^2+(2a^2+2a+2)x$
- $y^2=(2a^2+2a)x^6+(2a^2+a+1)x^5+(2a^2+2a+1)x^4+(a^2+2a+1)x^3+(a^2+2a+2)x^2+(2a^2+2a)x+a+2$
- $y^2=2ax^6+(a+2)x^5+(2a^2+a+1)x^4+(a^2+2a)x^3+a^2x^2+2ax+a^2+a$
- $y^2=(2a^2+2a+1)x^6+(2a^2+a+2)x^5+a^2x^4+ax^3+(2a^2+1)x^2+(a^2+a+1)x$
- $y^2=(a^2+a+2)x^6+(2a^2+a+2)x^5+(a^2+2)x^4+(a+2)x^3+(2a+2)x^2+(2a+2)x+a+2$
- $y^2=ax^6+(2a^2+2)x^5+ax^4+(2a^2+a)x^3+(2a^2+2a)x^2+(2a+2)x+2a^2$
- $y^2=a^2x^6+(a+1)x^5+(a^2+a+1)x^4+(2a^2+a+2)x^3+(2a+2)x^2+(a^2+2a)x+2$
- $y^2=2a^2x^6+(2a^2+2a)x^5+(a^2+1)x^4+(a^2+2a)x^2+x+2a^2+2a$
- $y^2=(a+2)x^6+(2a^2+2a+2)x^5+x^4+(2a^2+2a)x^3+2ax^2+(2a^2+2a)x+a^2+a+2$
- $y^2=(a^2+1)x^6+(2a^2+a+1)x^5+(a+2)x^4+(2a^2+2a)x^3+(2a^2+2)x^2+(2a^2+a+1)x+2a^2+2a+2$
- $y^2=(2a^2+2a+2)x^6+(2a^2+2a+2)x^5+x^4+(a^2+a+2)x^3+(2a+1)x^2+(a+2)x+a^2+2a+2$
- $y^2=(2a^2+1)x^6+(a^2+a)x^5+(a^2+2a+1)x^4+(2a^2+2a)x^3+(a^2+1)x^2+(a^2+2)x+a^2+2a+1$
- $y^2=(a^2+2a+2)x^6+ax^5+x^4+(a^2+a+2)x^3+2ax^2+x+a^2+2a+2$
- $y^2=(a^2+2a+1)x^6+(2a^2+2a+2)x^5+a^2x^4+(a+2)x^3+2x^2+(2a^2+2)x+2a+2$
- $y^2=(a+1)x^6+(2a^2+1)x^5+(a^2+1)x^4+(a^2+a+2)x^3+(a^2+2a+1)x^2+x+a+1$
- $y^2=(2a^2+2a+1)x^6+2ax^5+(a^2+2a+1)x^4+(a^2+2a+2)x^3+a^2x^2+(2a^2+2)x+a^2+2a$
- and 16 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{3^{3}}$.
Endomorphism algebra over $\F_{3^{3}}$The endomorphism algebra of this simple isogeny class is 4.0.3846400.2. |
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 |
---|---|---|
2.27.m_dc | $2$ | 2.729.q_de |