Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [931,2,Mod(99,931)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(931, base_ring=CyclotomicField(18))
chi = DirichletCharacter(H, H._module([0, 2]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("931.99");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 931 = 7^{2} \cdot 19 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 931.w (of order \(9\), degree \(6\), minimal) |
Newform invariants
comment: select newform
sage: f = N[0] # Warning: the index may be different
gp: f = lf[1] \\ Warning: the index may be different
| Self dual: | no |
| Analytic conductor: | \(7.43407242818\) |
| Analytic rank: | \(0\) |
| Dimension: | \(6\) |
| Coefficient field: | \(\Q(\zeta_{18})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{6} - x^{3} + 1 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 19) |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{9}]$ |
$q$-expansion
comment: q-expansion
sage: f.q_expansion() # note that sage often uses an isomorphic number field
gp: mfcoefs(f, 20)
Coefficients of the \(q\)-expansion are expressed in terms of a primitive root of unity \(\zeta_{18}\). We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/931\mathbb{Z}\right)^\times\).
| \(n\) | \(248\) | \(344\) |
| \(\chi(n)\) | \(1\) | \(-\zeta_{18}^{5}\) |
Embeddings
For each embedding \(\iota_m\) of the coefficient field, the values \(\iota_m(a_n)\) are shown below.
For more information on an embedded modular form you can click on its label.
comment: embeddings in the coefficient field
gp: mfembed(f)
| Label | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 99.1 |
|
−0.826352 | − | 0.300767i | −0.0923963 | − | 0.524005i | −0.939693 | − | 0.788496i | 1.93969 | − | 1.62760i | −0.0812519 | + | 0.460802i | 0 | 1.41875 | + | 2.45734i | 2.55303 | − | 0.929228i | −2.09240 | + | 0.761570i | ||||||||||||||||||||
| 442.1 | −0.826352 | + | 0.300767i | −0.0923963 | + | 0.524005i | −0.939693 | + | 0.788496i | 1.93969 | + | 1.62760i | −0.0812519 | − | 0.460802i | 0 | 1.41875 | − | 2.45734i | 2.55303 | + | 0.929228i | −2.09240 | − | 0.761570i | |||||||||||||||||||||
| 491.1 | −1.93969 | − | 1.62760i | −0.613341 | + | 0.223238i | 0.766044 | + | 4.34445i | 0.233956 | − | 1.32683i | 1.55303 | + | 0.565258i | 0 | 3.05303 | − | 5.28801i | −1.97178 | + | 1.65452i | −2.61334 | + | 2.19285i | |||||||||||||||||||||
| 785.1 | −1.93969 | + | 1.62760i | −0.613341 | − | 0.223238i | 0.766044 | − | 4.34445i | 0.233956 | + | 1.32683i | 1.55303 | − | 0.565258i | 0 | 3.05303 | + | 5.28801i | −1.97178 | − | 1.65452i | −2.61334 | − | 2.19285i | |||||||||||||||||||||
| 834.1 | −0.233956 | + | 1.32683i | 2.20574 | + | 1.85083i | 0.173648 | + | 0.0632028i | 0.826352 | − | 0.300767i | −2.97178 | + | 2.49362i | 0 | −1.47178 | + | 2.54920i | 0.918748 | + | 5.21048i | 0.205737 | + | 1.16679i | |||||||||||||||||||||
| 883.1 | −0.233956 | − | 1.32683i | 2.20574 | − | 1.85083i | 0.173648 | − | 0.0632028i | 0.826352 | + | 0.300767i | −2.97178 | − | 2.49362i | 0 | −1.47178 | − | 2.54920i | 0.918748 | − | 5.21048i | 0.205737 | − | 1.16679i | |||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 19.e | even | 9 | 1 | inner |
Twists
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(931, [\chi])\):
|
\( T_{2}^{6} + 6T_{2}^{5} + 18T_{2}^{4} + 30T_{2}^{3} + 36T_{2}^{2} + 27T_{2} + 9 \)
|
|
\( T_{3}^{6} - 3T_{3}^{5} + 3T_{3}^{4} + 8T_{3}^{3} + 6T_{3}^{2} + 3T_{3} + 1 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{6} + 6 T^{5} + \cdots + 9 \)
|
| $3$ |
\( T^{6} - 3 T^{5} + \cdots + 1 \)
|
| $5$ |
\( T^{6} - 6 T^{5} + \cdots + 9 \)
|
| $7$ |
\( T^{6} \)
|
| $11$ |
\( T^{6} + 9 T^{4} + \cdots + 81 \)
|
| $13$ |
\( T^{6} - 3 T^{5} + \cdots + 1369 \)
|
| $17$ |
\( T^{6} + 3 T^{5} + \cdots + 9 \)
|
| $19$ |
\( T^{6} - 12 T^{5} + \cdots + 6859 \)
|
| $23$ |
\( T^{6} - 6 T^{5} + \cdots + 576 \)
|
| $29$ |
\( T^{6} + 3 T^{5} + \cdots + 12321 \)
|
| $31$ |
\( T^{6} + 9 T^{5} + \cdots + 2809 \)
|
| $37$ |
\( (T^{3} - 21 T - 17)^{2} \)
|
| $41$ |
\( T^{6} + 21 T^{5} + \cdots + 12321 \)
|
| $43$ |
\( T^{6} + 3 T^{5} + \cdots + 26569 \)
|
| $47$ |
\( T^{6} - 3 T^{5} + \cdots + 9 \)
|
| $53$ |
\( T^{6} + 3 T^{5} + \cdots + 2601 \)
|
| $59$ |
\( T^{6} + 12 T^{5} + \cdots + 71289 \)
|
| $61$ |
\( T^{6} - 12 T^{5} + \cdots + 32761 \)
|
| $67$ |
\( T^{6} + 30 T^{5} + \cdots + 179776 \)
|
| $71$ |
\( T^{6} + 6 T^{5} + \cdots + 788544 \)
|
| $73$ |
\( T^{6} - 12 T^{5} + \cdots + 4096 \)
|
| $79$ |
\( T^{6} + 39 T^{5} + \cdots + 654481 \)
|
| $83$ |
\( T^{6} + 189 T^{4} + \cdots + 210681 \)
|
| $89$ |
\( T^{6} - 12 T^{5} + \cdots + 3249 \)
|
| $97$ |
\( T^{6} + 18 T^{5} + \cdots + 16129 \)
|
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