Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1391,1,Mod(1390,1391)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1391, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1, 1]))
N = Newforms(chi, 1, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("1391.1390");
S:= CuspForms(chi, 1);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1391 = 13 \cdot 107 \) |
| Weight: | \( k \) | \(=\) | \( 1 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1391.d (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: | \(0.694199432573\) |
| Analytic rank: | \(0\) |
| Dimension: | \(5\) |
| Coefficient field: | \(\Q(\zeta_{22})^+\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{5} - x^{4} - 4x^{3} + 3x^{2} + 3x - 1 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| Projective image: | \(D_{11}\) |
| Projective field: | Galois closure of 11.1.5207576397467951.1 |
$q$-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 basis \(1,\beta_1,\beta_2,\beta_3,\beta_4\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.
Basis of coefficient ring in terms of \(\nu = \zeta_{22} + \zeta_{22}^{-1}\):
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} - 2 \)
|
| \(\beta_{3}\) | \(=\) |
\( \nu^{3} - 3\nu \)
|
| \(\beta_{4}\) | \(=\) |
\( \nu^{4} - 4\nu^{2} + 2 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} + 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{3} + 3\beta_1 \)
|
| \(\nu^{4}\) | \(=\) |
\( \beta_{4} + 4\beta_{2} + 6 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1391\mathbb{Z}\right)^\times\).
| \(n\) | \(430\) | \(964\) |
| \(\chi(n)\) | \(-1\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1390.1 |
|
−1.68251 | −0.284630 | 1.83083 | −0.830830 | 0.478891 | 0.284630 | −1.39788 | −0.918986 | 1.39788 | |||||||||||||||||||||||||||||||||
| 1390.2 | −0.830830 | −1.91899 | −0.309721 | 1.30972 | 1.59435 | 1.91899 | 1.08816 | 2.68251 | −1.08816 | ||||||||||||||||||||||||||||||||||
| 1390.3 | 0.284630 | 0.830830 | −0.918986 | 1.91899 | 0.236479 | −0.830830 | −0.546200 | −0.309721 | 0.546200 | ||||||||||||||||||||||||||||||||||
| 1390.4 | 1.30972 | 1.68251 | 0.715370 | 0.284630 | 2.20362 | −1.68251 | −0.372786 | 1.83083 | 0.372786 | ||||||||||||||||||||||||||||||||||
| 1390.5 | 1.91899 | −1.30972 | 2.68251 | −1.68251 | −2.51334 | 1.30972 | 3.22871 | 0.715370 | −3.22871 | ||||||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 1391.d | odd | 2 | 1 | CM by \(\Q(\sqrt{-1391}) \) |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 1391.1.d.d | yes | 5 |
| 13.b | even | 2 | 1 | 1391.1.d.c | ✓ | 5 | |
| 107.b | odd | 2 | 1 | 1391.1.d.c | ✓ | 5 | |
| 1391.d | odd | 2 | 1 | CM | 1391.1.d.d | yes | 5 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 1391.1.d.c | ✓ | 5 | 13.b | even | 2 | 1 | |
| 1391.1.d.c | ✓ | 5 | 107.b | odd | 2 | 1 | |
| 1391.1.d.d | yes | 5 | 1.a | even | 1 | 1 | trivial |
| 1391.1.d.d | yes | 5 | 1391.d | odd | 2 | 1 | CM |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{1}^{\mathrm{new}}(1391, [\chi])\):
|
\( T_{2}^{5} - T_{2}^{4} - 4T_{2}^{3} + 3T_{2}^{2} + 3T_{2} - 1 \)
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\( T_{3}^{5} + T_{3}^{4} - 4T_{3}^{3} - 3T_{3}^{2} + 3T_{3} + 1 \)
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Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{5} - T^{4} - 4 T^{3} + \cdots - 1 \)
|
| $3$ |
\( T^{5} + T^{4} - 4 T^{3} + \cdots + 1 \)
|
| $5$ |
\( T^{5} - T^{4} - 4 T^{3} + \cdots - 1 \)
|
| $7$ |
\( T^{5} - T^{4} - 4 T^{3} + \cdots - 1 \)
|
| $11$ |
\( T^{5} \)
|
| $13$ |
\( (T - 1)^{5} \)
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| $17$ |
\( T^{5} \)
|
| $19$ |
\( T^{5} \)
|
| $23$ |
\( T^{5} + T^{4} - 4 T^{3} + \cdots + 1 \)
|
| $29$ |
\( T^{5} + T^{4} - 4 T^{3} + \cdots + 1 \)
|
| $31$ |
\( T^{5} - T^{4} - 4 T^{3} + \cdots - 1 \)
|
| $37$ |
\( T^{5} \)
|
| $41$ |
\( T^{5} \)
|
| $43$ |
\( T^{5} \)
|
| $47$ |
\( T^{5} \)
|
| $53$ |
\( T^{5} + T^{4} - 4 T^{3} + \cdots + 1 \)
|
| $59$ |
\( T^{5} - T^{4} - 4 T^{3} + \cdots - 1 \)
|
| $61$ |
\( T^{5} + T^{4} - 4 T^{3} + \cdots + 1 \)
|
| $67$ |
\( (T + 2)^{5} \)
|
| $71$ |
\( T^{5} - T^{4} - 4 T^{3} + \cdots - 1 \)
|
| $73$ |
\( T^{5} - T^{4} - 4 T^{3} + \cdots - 1 \)
|
| $79$ |
\( T^{5} + T^{4} - 4 T^{3} + \cdots + 1 \)
|
| $83$ |
\( T^{5} \)
|
| $89$ |
\( T^{5} \)
|
| $97$ |
\( T^{5} - T^{4} - 4 T^{3} + \cdots - 1 \)
|
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