Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [882,4,Mod(361,882)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(882, base_ring=CyclotomicField(6))
chi = DirichletCharacter(H, H._module([0, 4]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("882.361");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 882 = 2 \cdot 3^{2} \cdot 7^{2} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 882.g (of order \(3\), degree \(2\), not 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: | \(52.0396846251\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Relative dimension: | \(2\) over \(\Q(\zeta_{3})\) |
| Coefficient field: | \(\Q(\sqrt{-3}, \sqrt{193})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} + 49x^{2} + 48x + 2304 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{19}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 126) |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{3}]$ |
$q$-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 basis \(1,\beta_1,\beta_2,\beta_3\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.
Basis of coefficient ring in terms of a root \(\nu\) of
\( x^{4} - x^{3} + 49x^{2} + 48x + 2304 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -\nu^{3} + 49\nu^{2} - 49\nu + 2304 ) / 2352 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( \nu^{3} + 97 ) / 49 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{3} + 48\beta_{2} + \beta _1 - 49 \)
|
| \(\nu^{3}\) | \(=\) |
\( 49\beta_{3} - 97 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/882\mathbb{Z}\right)^\times\).
| \(n\) | \(199\) | \(785\) |
| \(\chi(n)\) | \(-\beta_{2}\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 361.1 |
|
1.00000 | + | 1.73205i | 0 | −2.00000 | + | 3.46410i | −1.72311 | − | 2.98452i | 0 | 0 | −8.00000 | 0 | 3.44622 | − | 5.96903i | ||||||||||||||||||||||
| 361.2 | 1.00000 | + | 1.73205i | 0 | −2.00000 | + | 3.46410i | 5.22311 | + | 9.04669i | 0 | 0 | −8.00000 | 0 | −10.4462 | + | 18.0934i | |||||||||||||||||||||||
| 667.1 | 1.00000 | − | 1.73205i | 0 | −2.00000 | − | 3.46410i | −1.72311 | + | 2.98452i | 0 | 0 | −8.00000 | 0 | 3.44622 | + | 5.96903i | |||||||||||||||||||||||
| 667.2 | 1.00000 | − | 1.73205i | 0 | −2.00000 | − | 3.46410i | 5.22311 | − | 9.04669i | 0 | 0 | −8.00000 | 0 | −10.4462 | − | 18.0934i | |||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 7.c | even | 3 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 882.4.g.bj | 4 | |
| 3.b | odd | 2 | 1 | 882.4.g.z | 4 | ||
| 7.b | odd | 2 | 1 | 126.4.g.f | yes | 4 | |
| 7.c | even | 3 | 1 | 882.4.a.u | 2 | ||
| 7.c | even | 3 | 1 | inner | 882.4.g.bj | 4 | |
| 7.d | odd | 6 | 1 | 126.4.g.f | yes | 4 | |
| 7.d | odd | 6 | 1 | 882.4.a.ba | 2 | ||
| 21.c | even | 2 | 1 | 126.4.g.e | ✓ | 4 | |
| 21.g | even | 6 | 1 | 126.4.g.e | ✓ | 4 | |
| 21.g | even | 6 | 1 | 882.4.a.bd | 2 | ||
| 21.h | odd | 6 | 1 | 882.4.a.bh | 2 | ||
| 21.h | odd | 6 | 1 | 882.4.g.z | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 126.4.g.e | ✓ | 4 | 21.c | even | 2 | 1 | |
| 126.4.g.e | ✓ | 4 | 21.g | even | 6 | 1 | |
| 126.4.g.f | yes | 4 | 7.b | odd | 2 | 1 | |
| 126.4.g.f | yes | 4 | 7.d | odd | 6 | 1 | |
| 882.4.a.u | 2 | 7.c | even | 3 | 1 | ||
| 882.4.a.ba | 2 | 7.d | odd | 6 | 1 | ||
| 882.4.a.bd | 2 | 21.g | even | 6 | 1 | ||
| 882.4.a.bh | 2 | 21.h | odd | 6 | 1 | ||
| 882.4.g.z | 4 | 3.b | odd | 2 | 1 | ||
| 882.4.g.z | 4 | 21.h | odd | 6 | 1 | ||
| 882.4.g.bj | 4 | 1.a | even | 1 | 1 | trivial | |
| 882.4.g.bj | 4 | 7.c | even | 3 | 1 | inner | |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(882, [\chi])\):
|
\( T_{5}^{4} - 7T_{5}^{3} + 85T_{5}^{2} + 252T_{5} + 1296 \)
|
|
\( T_{11}^{4} - 25T_{11}^{3} + 2833T_{11}^{2} + 55200T_{11} + 4875264 \)
|
|
\( T_{13}^{2} - 49T_{13} - 606 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{2} - 2 T + 4)^{2} \)
|
| $3$ |
\( T^{4} \)
|
| $5$ |
\( T^{4} - 7 T^{3} + 85 T^{2} + \cdots + 1296 \)
|
| $7$ |
\( T^{4} \)
|
| $11$ |
\( T^{4} - 25 T^{3} + 2833 T^{2} + \cdots + 4875264 \)
|
| $13$ |
\( (T^{2} - 49 T - 606)^{2} \)
|
| $17$ |
\( T^{4} - 98 T^{3} + 12028 T^{2} + \cdots + 5875776 \)
|
| $19$ |
\( T^{4} + 119 T^{3} + 11055 T^{2} + \cdots + 9647236 \)
|
| $23$ |
\( T^{4} + 122 T^{3} + \cdots + 32901696 \)
|
| $29$ |
\( (T^{2} - 73 T - 1032)^{2} \)
|
| $31$ |
\( T^{4} - 98 T^{3} + \cdots + 1255072329 \)
|
| $37$ |
\( T^{4} + 289 T^{3} + 83919 T^{2} + \cdots + 158404 \)
|
| $41$ |
\( (T + 168)^{4} \)
|
| $43$ |
\( (T^{2} - 307 T + 2284)^{2} \)
|
| $47$ |
\( T^{4} - 672 T^{3} + \cdots + 7242690816 \)
|
| $53$ |
\( T^{4} - 375 T^{3} + \cdots + 24444697104 \)
|
| $59$ |
\( T^{4} - 763 T^{3} + \cdots + 1155728016 \)
|
| $61$ |
\( T^{4} + 406 T^{3} + \cdots + 212226624 \)
|
| $67$ |
\( T^{4} - 1041 T^{3} + \cdots + 44865170596 \)
|
| $71$ |
\( (T^{2} - 1652 T + 644448)^{2} \)
|
| $73$ |
\( T^{4} + 189 T^{3} + \cdots + 198073062916 \)
|
| $79$ |
\( T^{4} + 524 T^{3} + \cdots + 155826773001 \)
|
| $83$ |
\( (T^{2} + 287 T - 361596)^{2} \)
|
| $89$ |
\( T^{4} - 2394 T^{3} + \cdots + 1669553420544 \)
|
| $97$ |
\( (T^{2} - 63 T - 1158214)^{2} \)
|
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