Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [40,17,Mod(19,40)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(40, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1, 1, 1]))
N = Newforms(chi, 17, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("40.19");
S:= CuspForms(chi, 17);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 40 = 2^{3} \cdot 5 \) |
| Weight: | \( k \) | \(=\) | \( 17 \) |
| Character orbit: | \([\chi]\) | \(=\) | 40.e (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: | \(64.9298175427\) |
| 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 \(\left(\mathbb{Z}/40\mathbb{Z}\right)^\times\).
| \(n\) | \(17\) | \(21\) | \(31\) |
| \(\chi(n)\) | \(1\) | \(1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 19.1 |
|
−256.000 | 0 | 65536.0 | −390625. | 0 | 1.06118e7 | −1.67772e7 | 4.30467e7 | 1.00000e8 | |||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 40.e | odd | 2 | 1 | CM by \(\Q(\sqrt{-10}) \) |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 40.17.e.a | ✓ | 1 |
| 5.b | even | 2 | 1 | 40.17.e.b | yes | 1 | |
| 8.d | odd | 2 | 1 | 40.17.e.b | yes | 1 | |
| 40.e | odd | 2 | 1 | CM | 40.17.e.a | ✓ | 1 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 40.17.e.a | ✓ | 1 | 1.a | even | 1 | 1 | trivial |
| 40.17.e.a | ✓ | 1 | 40.e | odd | 2 | 1 | CM |
| 40.17.e.b | yes | 1 | 5.b | even | 2 | 1 | |
| 40.17.e.b | yes | 1 | 8.d | odd | 2 | 1 | |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{17}^{\mathrm{new}}(40, [\chi])\):
|
\( T_{3} \)
|
|
\( T_{7} - 10611838 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T + 256 \)
|
| $3$ |
\( T \)
|
| $5$ |
\( T + 390625 \)
|
| $7$ |
\( T - 10611838 \)
|
| $11$ |
\( T - 80145602 \)
|
| $13$ |
\( T - 469878718 \)
|
| $17$ |
\( T \)
|
| $19$ |
\( T - 30997707842 \)
|
| $23$ |
\( T + 14573712002 \)
|
| $29$ |
\( T \)
|
| $31$ |
\( T \)
|
| $37$ |
\( T + 6788439115202 \)
|
| $41$ |
\( T + 12880123209598 \)
|
| $43$ |
\( T \)
|
| $47$ |
\( T - 46828909712638 \)
|
| $53$ |
\( T + 123883372774082 \)
|
| $59$ |
\( T - 256890818481602 \)
|
| $61$ |
\( T \)
|
| $67$ |
\( T \)
|
| $71$ |
\( T \)
|
| $73$ |
\( T \)
|
| $79$ |
\( T \)
|
| $83$ |
\( T \)
|
| $89$ |
\( T - 5426410922236802 \)
|
| $97$ |
\( T \)
|
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