Invariants
| Base field: | $\F_{83}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - 4 x + 146 x^{2} - 332 x^{3} + 6889 x^{4}$ |
| Frobenius angles: | $\pm0.376395054759$, $\pm0.550859926400$ |
| Angle rank: | $2$ (numerical) |
| Number field: | \(\Q(\sqrt{-76 +2 \sqrt{6}})\) |
| Galois group: | $D_{4}$ |
| Jacobians: | $168$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $6700$ | $49392400$ | $327336225100$ | $2251756050688000$ | $15515934657145283500$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $80$ | $7166$ | $572480$ | $47447022$ | $3939013600$ | $326940243374$ | $27136045899280$ | $2252292299624158$ | $186940256423819120$ | $15516041181183688286$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 168 curves (of which all are hyperelliptic):
- $y^2=8 x^6+2 x^5+40 x^4+37 x^3+75 x^2+27 x+73$
- $y^2=43 x^6+3 x^5+65 x^4+5 x^3+35 x^2+68 x+58$
- $y^2=58 x^6+40 x^5+82 x^4+x^3+29 x^2+42 x+37$
- $y^2=76 x^6+17 x^5+22 x^4+49 x^3+30 x^2+82 x+16$
- $y^2=16 x^6+73 x^5+15 x^4+79 x^3+43 x^2+26$
- $y^2=41 x^6+62 x^5+32 x^4+23 x^3+29 x^2+32 x+26$
- $y^2=30 x^6+40 x^5+71 x^4+28 x^3+23 x^2+6 x+23$
- $y^2=11 x^6+11 x^5+68 x^4+58 x^3+66 x^2+50 x+15$
- $y^2=67 x^6+3 x^5+42 x^4+19 x^3+79 x^2+48 x+18$
- $y^2=35 x^6+36 x^5+9 x^4+41 x^3+6 x^2+12 x+46$
- $y^2=81 x^6+10 x^5+27 x^4+36 x^3+29 x^2+68 x+75$
- $y^2=73 x^6+37 x^5+3 x^4+25 x^3+9 x^2+49 x+3$
- $y^2=14 x^6+82 x^5+19 x^4+54 x^3+50 x^2+53 x+79$
- $y^2=19 x^6+65 x^5+26 x^4+80 x^3+60 x^2+62 x+49$
- $y^2=13 x^6+35 x^5+28 x^4+31 x^3+56 x^2+29 x+63$
- $y^2=39 x^6+12 x^5+64 x^4+20 x^2+63 x+53$
- $y^2=72 x^6+33 x^5+42 x^4+34 x^3+59 x^2+15 x+7$
- $y^2=53 x^6+27 x^5+18 x^4+35 x^3+37 x^2+42 x+54$
- $y^2=60 x^6+57 x^5+26 x^4+58 x^3+31 x^2+3 x+5$
- $y^2=33 x^6+82 x^5+34 x^4+57 x^2+32 x+37$
- and 148 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{83}$.
Endomorphism algebra over $\F_{83}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-76 +2 \sqrt{6}})\). |
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 |
|---|---|---|
| 2.83.e_fq | $2$ | (not in LMFDB) |