Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [26,6,Mod(25,26)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(26, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1]))
N = Newforms(chi, 6, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("26.25");
S:= CuspForms(chi, 6);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 26 = 2 \cdot 13 \) |
| Weight: | \( k \) | \(=\) | \( 6 \) |
| Character orbit: | \([\chi]\) | \(=\) | 26.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: | no |
| Analytic conductor: | \(4.16997931514\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{-1}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 2 \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{2}]$ |
$q$-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 \(\beta = 2i\). We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/26\mathbb{Z}\right)^\times\).
| \(n\) | \(15\) |
| \(\chi(n)\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25.1 |
|
− | 4.00000i | 4.00000 | −16.0000 | − | 68.0000i | − | 16.0000i | − | 82.0000i | 64.0000i | −227.000 | −272.000 | ||||||||||||||||||||
| 25.2 | 4.00000i | 4.00000 | −16.0000 | 68.0000i | 16.0000i | 82.0000i | − | 64.0000i | −227.000 | −272.000 | ||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 13.b | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 26.6.b.b | ✓ | 2 |
| 3.b | odd | 2 | 1 | 234.6.b.a | 2 | ||
| 4.b | odd | 2 | 1 | 208.6.f.a | 2 | ||
| 13.b | even | 2 | 1 | inner | 26.6.b.b | ✓ | 2 |
| 13.d | odd | 4 | 1 | 338.6.a.b | 1 | ||
| 13.d | odd | 4 | 1 | 338.6.a.e | 1 | ||
| 39.d | odd | 2 | 1 | 234.6.b.a | 2 | ||
| 52.b | odd | 2 | 1 | 208.6.f.a | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 26.6.b.b | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 26.6.b.b | ✓ | 2 | 13.b | even | 2 | 1 | inner |
| 208.6.f.a | 2 | 4.b | odd | 2 | 1 | ||
| 208.6.f.a | 2 | 52.b | odd | 2 | 1 | ||
| 234.6.b.a | 2 | 3.b | odd | 2 | 1 | ||
| 234.6.b.a | 2 | 39.d | odd | 2 | 1 | ||
| 338.6.a.b | 1 | 13.d | odd | 4 | 1 | ||
| 338.6.a.e | 1 | 13.d | odd | 4 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3} - 4 \)
acting on \(S_{6}^{\mathrm{new}}(26, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} + 16 \)
|
| $3$ |
\( (T - 4)^{2} \)
|
| $5$ |
\( T^{2} + 4624 \)
|
| $7$ |
\( T^{2} + 6724 \)
|
| $11$ |
\( T^{2} + 152100 \)
|
| $13$ |
\( T^{2} - 1014 T + 371293 \)
|
| $17$ |
\( (T - 1738)^{2} \)
|
| $19$ |
\( T^{2} + 1153476 \)
|
| $23$ |
\( (T - 2104)^{2} \)
|
| $29$ |
\( (T + 1690)^{2} \)
|
| $31$ |
\( T^{2} + 2044900 \)
|
| $37$ |
\( T^{2} + 78357904 \)
|
| $41$ |
\( T^{2} + 45697600 \)
|
| $43$ |
\( (T + 16916)^{2} \)
|
| $47$ |
\( T^{2} + 632924964 \)
|
| $53$ |
\( (T - 38214)^{2} \)
|
| $59$ |
\( T^{2} + 453093796 \)
|
| $61$ |
\( (T + 5458)^{2} \)
|
| $67$ |
\( T^{2} + 1983989764 \)
|
| $71$ |
\( T^{2} + 316484100 \)
|
| $73$ |
\( T^{2} + 964972096 \)
|
| $79$ |
\( (T + 45360)^{2} \)
|
| $83$ |
\( T^{2} + 15511706116 \)
|
| $89$ |
\( T^{2} + 351337536 \)
|
| $97$ |
\( T^{2} + 14759334144 \)
|
| show more | |
| show less |