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: | \(\Q(\sqrt{2}, \sqrt{-3})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 2x^{2} + 4 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{25}]\) |
| Coefficient ring index: | \( 7^{2} \) |
| Twist minimal: | no (minimal twist has level 294) |
| 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
\( x^{4} + 2x^{2} + 4 \)
:
| \(\beta_{1}\) | \(=\) |
\( 7\nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{2} ) / 2 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( 7\nu^{3} ) / 2 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_1 ) / 7 \)
|
| \(\nu^{2}\) | \(=\) |
\( 2\beta_{2} \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 2\beta_{3} ) / 7 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/882\mathbb{Z}\right)^\times\).
| \(n\) | \(199\) | \(785\) |
| \(\chi(n)\) | \(-1 - \beta_{2}\) | \(1\) |
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 | −1.94975 | − | 3.37706i | 0 | 0 | 8.00000 | 0 | −3.89949 | + | 6.75412i | ||||||||||||||||||||||
| 361.2 | −1.00000 | − | 1.73205i | 0 | −2.00000 | + | 3.46410i | 7.94975 | + | 13.7694i | 0 | 0 | 8.00000 | 0 | 15.8995 | − | 27.5387i | |||||||||||||||||||||||
| 667.1 | −1.00000 | + | 1.73205i | 0 | −2.00000 | − | 3.46410i | −1.94975 | + | 3.37706i | 0 | 0 | 8.00000 | 0 | −3.89949 | − | 6.75412i | |||||||||||||||||||||||
| 667.2 | −1.00000 | + | 1.73205i | 0 | −2.00000 | − | 3.46410i | 7.94975 | − | 13.7694i | 0 | 0 | 8.00000 | 0 | 15.8995 | + | 27.5387i | |||||||||||||||||||||||
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.bd | 4 | |
| 3.b | odd | 2 | 1 | 294.4.e.o | 4 | ||
| 7.b | odd | 2 | 1 | 882.4.g.y | 4 | ||
| 7.c | even | 3 | 1 | 882.4.a.bc | 2 | ||
| 7.c | even | 3 | 1 | inner | 882.4.g.bd | 4 | |
| 7.d | odd | 6 | 1 | 882.4.a.bi | 2 | ||
| 7.d | odd | 6 | 1 | 882.4.g.y | 4 | ||
| 21.c | even | 2 | 1 | 294.4.e.n | 4 | ||
| 21.g | even | 6 | 1 | 294.4.a.k | yes | 2 | |
| 21.g | even | 6 | 1 | 294.4.e.n | 4 | ||
| 21.h | odd | 6 | 1 | 294.4.a.j | ✓ | 2 | |
| 21.h | odd | 6 | 1 | 294.4.e.o | 4 | ||
| 84.j | odd | 6 | 1 | 2352.4.a.bn | 2 | ||
| 84.n | even | 6 | 1 | 2352.4.a.cd | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 294.4.a.j | ✓ | 2 | 21.h | odd | 6 | 1 | |
| 294.4.a.k | yes | 2 | 21.g | even | 6 | 1 | |
| 294.4.e.n | 4 | 21.c | even | 2 | 1 | ||
| 294.4.e.n | 4 | 21.g | even | 6 | 1 | ||
| 294.4.e.o | 4 | 3.b | odd | 2 | 1 | ||
| 294.4.e.o | 4 | 21.h | odd | 6 | 1 | ||
| 882.4.a.bc | 2 | 7.c | even | 3 | 1 | ||
| 882.4.a.bi | 2 | 7.d | odd | 6 | 1 | ||
| 882.4.g.y | 4 | 7.b | odd | 2 | 1 | ||
| 882.4.g.y | 4 | 7.d | odd | 6 | 1 | ||
| 882.4.g.bd | 4 | 1.a | even | 1 | 1 | trivial | |
| 882.4.g.bd | 4 | 7.c | even | 3 | 1 | inner | |
| 2352.4.a.bn | 2 | 84.j | odd | 6 | 1 | ||
| 2352.4.a.cd | 2 | 84.n | even | 6 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(882, [\chi])\):
|
\( T_{5}^{4} - 12T_{5}^{3} + 206T_{5}^{2} + 744T_{5} + 3844 \)
|
|
\( T_{11}^{4} + 4T_{11}^{3} + 3540T_{11}^{2} - 14096T_{11} + 12418576 \)
|
|
\( T_{13}^{2} - 48T_{13} - 306 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{2} + 2 T + 4)^{2} \)
|
| $3$ |
\( T^{4} \)
|
| $5$ |
\( T^{4} - 12 T^{3} + \cdots + 3844 \)
|
| $7$ |
\( T^{4} \)
|
| $11$ |
\( T^{4} + 4 T^{3} + \cdots + 12418576 \)
|
| $13$ |
\( (T^{2} - 48 T - 306)^{2} \)
|
| $17$ |
\( T^{4} - 84 T^{3} + \cdots + 2775556 \)
|
| $19$ |
\( T^{4} - 72 T^{3} + \cdots + 817216 \)
|
| $23$ |
\( T^{4} + 308 T^{3} + \cdots + 407555344 \)
|
| $29$ |
\( (T^{2} - 80 T - 30152)^{2} \)
|
| $31$ |
\( T^{4} + \cdots + 1111288896 \)
|
| $37$ |
\( T^{4} + \cdots + 3330674944 \)
|
| $41$ |
\( (T^{2} + 756 T + 140434)^{2} \)
|
| $43$ |
\( (T^{2} - 400 T - 16448)^{2} \)
|
| $47$ |
\( T^{4} - 312 T^{3} + \cdots + 211295296 \)
|
| $53$ |
\( T^{4} + \cdots + 3110515984 \)
|
| $59$ |
\( T^{4} + \cdots + 34682357824 \)
|
| $61$ |
\( T^{4} + \cdots + 234936028804 \)
|
| $67$ |
\( T^{4} + \cdots + 2627997696 \)
|
| $71$ |
\( (T^{2} - 1524 T + 492444)^{2} \)
|
| $73$ |
\( T^{4} + \cdots + 288087680644 \)
|
| $79$ |
\( T^{4} + \cdots + 205520782336 \)
|
| $83$ |
\( (T^{2} - 312 T - 1788272)^{2} \)
|
| $89$ |
\( T^{4} + \cdots + 6320568004 \)
|
| $97$ |
\( (T^{2} + 744 T - 1392866)^{2} \)
|
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