Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [26,4,Mod(3,26)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(26, base_ring=CyclotomicField(6))
chi = DirichletCharacter(H, H._module([2]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("26.3");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 26 = 2 \cdot 13 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 26.c (of order \(3\), degree \(2\), 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: | \(1.53404966015\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{-3}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x + 1 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| 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 primitive root of unity \(\zeta_{6}\). We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/26\mathbb{Z}\right)^\times\).
| \(n\) | \(15\) |
| \(\chi(n)\) | \(-\zeta_{6}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3.1 |
|
1.00000 | + | 1.73205i | 1.50000 | + | 2.59808i | −2.00000 | + | 3.46410i | 2.00000 | −3.00000 | + | 5.19615i | 2.50000 | − | 4.33013i | −8.00000 | 9.00000 | − | 15.5885i | 2.00000 | + | 3.46410i | ||||||||||
| 9.1 | 1.00000 | − | 1.73205i | 1.50000 | − | 2.59808i | −2.00000 | − | 3.46410i | 2.00000 | −3.00000 | − | 5.19615i | 2.50000 | + | 4.33013i | −8.00000 | 9.00000 | + | 15.5885i | 2.00000 | − | 3.46410i | |||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 13.c | even | 3 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 26.4.c.a | ✓ | 2 |
| 3.b | odd | 2 | 1 | 234.4.h.b | 2 | ||
| 4.b | odd | 2 | 1 | 208.4.i.a | 2 | ||
| 13.b | even | 2 | 1 | 338.4.c.d | 2 | ||
| 13.c | even | 3 | 1 | inner | 26.4.c.a | ✓ | 2 |
| 13.c | even | 3 | 1 | 338.4.a.a | 1 | ||
| 13.d | odd | 4 | 2 | 338.4.e.d | 4 | ||
| 13.e | even | 6 | 1 | 338.4.a.d | 1 | ||
| 13.e | even | 6 | 1 | 338.4.c.d | 2 | ||
| 13.f | odd | 12 | 2 | 338.4.b.a | 2 | ||
| 13.f | odd | 12 | 2 | 338.4.e.d | 4 | ||
| 39.i | odd | 6 | 1 | 234.4.h.b | 2 | ||
| 52.j | odd | 6 | 1 | 208.4.i.a | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 26.4.c.a | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 26.4.c.a | ✓ | 2 | 13.c | even | 3 | 1 | inner |
| 208.4.i.a | 2 | 4.b | odd | 2 | 1 | ||
| 208.4.i.a | 2 | 52.j | odd | 6 | 1 | ||
| 234.4.h.b | 2 | 3.b | odd | 2 | 1 | ||
| 234.4.h.b | 2 | 39.i | odd | 6 | 1 | ||
| 338.4.a.a | 1 | 13.c | even | 3 | 1 | ||
| 338.4.a.d | 1 | 13.e | even | 6 | 1 | ||
| 338.4.b.a | 2 | 13.f | odd | 12 | 2 | ||
| 338.4.c.d | 2 | 13.b | even | 2 | 1 | ||
| 338.4.c.d | 2 | 13.e | even | 6 | 1 | ||
| 338.4.e.d | 4 | 13.d | odd | 4 | 2 | ||
| 338.4.e.d | 4 | 13.f | odd | 12 | 2 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{2} - 3T_{3} + 9 \)
acting on \(S_{4}^{\mathrm{new}}(26, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} - 2T + 4 \)
|
| $3$ |
\( T^{2} - 3T + 9 \)
|
| $5$ |
\( (T - 2)^{2} \)
|
| $7$ |
\( T^{2} - 5T + 25 \)
|
| $11$ |
\( T^{2} + 13T + 169 \)
|
| $13$ |
\( T^{2} + 26T + 2197 \)
|
| $17$ |
\( T^{2} + 27T + 729 \)
|
| $19$ |
\( T^{2} + 75T + 5625 \)
|
| $23$ |
\( T^{2} - 187T + 34969 \)
|
| $29$ |
\( T^{2} - 13T + 169 \)
|
| $31$ |
\( (T + 104)^{2} \)
|
| $37$ |
\( T^{2} + 423T + 178929 \)
|
| $41$ |
\( T^{2} + 195T + 38025 \)
|
| $43$ |
\( T^{2} + 199T + 39601 \)
|
| $47$ |
\( (T - 388)^{2} \)
|
| $53$ |
\( (T - 618)^{2} \)
|
| $59$ |
\( T^{2} + 491T + 241081 \)
|
| $61$ |
\( T^{2} + 175T + 30625 \)
|
| $67$ |
\( T^{2} + 817T + 667489 \)
|
| $71$ |
\( T^{2} + 79T + 6241 \)
|
| $73$ |
\( (T - 230)^{2} \)
|
| $79$ |
\( (T - 764)^{2} \)
|
| $83$ |
\( (T + 732)^{2} \)
|
| $89$ |
\( T^{2} - 1041 T + 1083681 \)
|
| $97$ |
\( T^{2} - 97T + 9409 \)
|
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