Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [91,9,Mod(90,91)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(91, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1, 1]))
N = Newforms(chi, 9, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("91.90");
S:= CuspForms(chi, 9);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 91 = 7 \cdot 13 \) |
| Weight: | \( k \) | \(=\) | \( 9 \) |
| Character orbit: | \([\chi]\) | \(=\) | 91.b (of order \(2\), degree \(1\), 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: | yes |
| Analytic conductor: | \(37.0714535156\) |
| Analytic rank: | \(0\) |
| Dimension: | \(1\) |
| Coefficient field: | \(\mathbb{Q}\) |
| Coefficient ring: | \(\mathbb{Z}\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{U}(1)[D_{2}]$ |
$q$-expansion
comment: q-expansion
sage: f.q_expansion() # note that sage often uses an isomorphic number field
gp: mfcoefs(f, 20)
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/91\mathbb{Z}\right)^\times\).
| \(n\) | \(15\) | \(66\) |
| \(\chi(n)\) | \(-1\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 90.1 |
|
0 | 0 | 256.000 | −431.000 | 0 | −2401.00 | 0 | 6561.00 | 0 | |||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 91.b | odd | 2 | 1 | CM by \(\Q(\sqrt{-91}) \) |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 91.9.b.a | ✓ | 1 |
| 7.b | odd | 2 | 1 | 91.9.b.b | yes | 1 | |
| 13.b | even | 2 | 1 | 91.9.b.b | yes | 1 | |
| 91.b | odd | 2 | 1 | CM | 91.9.b.a | ✓ | 1 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 91.9.b.a | ✓ | 1 | 1.a | even | 1 | 1 | trivial |
| 91.9.b.a | ✓ | 1 | 91.b | odd | 2 | 1 | CM |
| 91.9.b.b | yes | 1 | 7.b | odd | 2 | 1 | |
| 91.9.b.b | yes | 1 | 13.b | even | 2 | 1 | |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{9}^{\mathrm{new}}(91, [\chi])\):
|
\( T_{2} \)
|
|
\( T_{5} + 431 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T \)
|
| $3$ |
\( T \)
|
| $5$ |
\( T + 431 \)
|
| $7$ |
\( T + 2401 \)
|
| $11$ |
\( T \)
|
| $13$ |
\( T + 28561 \)
|
| $17$ |
\( T \)
|
| $19$ |
\( T - 251233 \)
|
| $23$ |
\( T - 375407 \)
|
| $29$ |
\( T + 1062913 \)
|
| $31$ |
\( T - 630433 \)
|
| $37$ |
\( T \)
|
| $41$ |
\( T + 409922 \)
|
| $43$ |
\( T - 6653327 \)
|
| $47$ |
\( T - 5166913 \)
|
| $53$ |
\( T - 13303487 \)
|
| $59$ |
\( T - 22939678 \)
|
| $61$ |
\( T \)
|
| $67$ |
\( T \)
|
| $71$ |
\( T \)
|
| $73$ |
\( T + 39577007 \)
|
| $79$ |
\( T + 14012113 \)
|
| $83$ |
\( T + 37402367 \)
|
| $89$ |
\( T + 4088207 \)
|
| $97$ |
\( T - 174312913 \)
|
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