Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [91,8,Mod(1,91)]
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([0, 0]))
N = Newforms(chi, 8, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("91.1");
S:= CuspForms(chi, 8);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 91 = 7 \cdot 13 \) |
| Weight: | \( k \) | \(=\) | \( 8 \) |
| Character orbit: | \([\chi]\) | \(=\) | 91.a (trivial) |
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: | \(28.4270373191\) |
| Analytic rank: | \(0\) |
| Dimension: | \(1\) |
| Coefficient field: | \(\mathbb{Q}\) |
| Coefficient ring: | \(\mathbb{Z}\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| Fricke sign: | \(+1\) |
| Sato-Tate group: | $\mathrm{SU}(2)$ |
$q$-expansion
comment: q-expansion
sage: f.q_expansion() # note that sage often uses an isomorphic number field
gp: mfcoefs(f, 20)
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.1 |
|
22.0000 | 21.0000 | 356.000 | 140.000 | 462.000 | −343.000 | 5016.00 | −1746.00 | 3080.00 | |||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(7\) | \( +1 \) |
| \(13\) | \( +1 \) |
Inner twists
This newform does not admit any (nontrivial) inner twists.
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 91.8.a.a | ✓ | 1 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 91.8.a.a | ✓ | 1 | 1.a | even | 1 | 1 | trivial |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2} - 22 \)
acting on \(S_{8}^{\mathrm{new}}(\Gamma_0(91))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T - 22 \)
|
| $3$ |
\( T - 21 \)
|
| $5$ |
\( T - 140 \)
|
| $7$ |
\( T + 343 \)
|
| $11$ |
\( T - 5051 \)
|
| $13$ |
\( T + 2197 \)
|
| $17$ |
\( T - 27384 \)
|
| $19$ |
\( T + 32690 \)
|
| $23$ |
\( T + 23085 \)
|
| $29$ |
\( T + 14068 \)
|
| $31$ |
\( T + 203007 \)
|
| $37$ |
\( T - 544041 \)
|
| $41$ |
\( T + 352079 \)
|
| $43$ |
\( T - 340412 \)
|
| $47$ |
\( T - 406329 \)
|
| $53$ |
\( T + 1909680 \)
|
| $59$ |
\( T + 2867214 \)
|
| $61$ |
\( T + 216419 \)
|
| $67$ |
\( T - 2538043 \)
|
| $71$ |
\( T + 2071872 \)
|
| $73$ |
\( T - 185913 \)
|
| $79$ |
\( T + 954631 \)
|
| $83$ |
\( T - 5649672 \)
|
| $89$ |
\( T + 4673830 \)
|
| $97$ |
\( T + 13686645 \)
|
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