Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [946,2,Mod(351,946)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(946, base_ring=CyclotomicField(6))
chi = DirichletCharacter(H, H._module([3, 5]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("946.351");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 946 = 2 \cdot 11 \cdot 43 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 946.h (of order \(6\), 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: | \(7.55384803121\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Relative dimension: | \(2\) over \(\Q(\zeta_{6})\) |
| Coefficient field: | \(\Q(\sqrt{-3}, \sqrt{-11})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} - 2x^{2} - 3x + 9 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{9}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{6}]$ |
$q$-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 \(1,\beta_1,\beta_2,\beta_3\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.
Basis of coefficient ring in terms of a root \(\nu\) of
\( x^{4} - x^{3} - 2x^{2} - 3x + 9 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{3} + 2\nu^{2} - 2\nu - 3 ) / 6 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( -\nu^{3} + 2\nu + 3 ) / 2 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{3} + 3\beta_{2} \)
|
| \(\nu^{3}\) | \(=\) |
\( -2\beta_{3} + 2\beta _1 + 3 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/946\mathbb{Z}\right)^\times\).
| \(n\) | \(89\) | \(431\) |
| \(\chi(n)\) | \(\beta_{2}\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 351.1 |
|
−1.00000 | −0.686141 | + | 0.396143i | 1.00000 | 0.686141 | − | 0.396143i | 0.686141 | − | 0.396143i | 1.68614 | − | 2.92048i | −1.00000 | −1.18614 | + | 2.05446i | −0.686141 | + | 0.396143i | ||||||||||||||||||
| 351.2 | −1.00000 | 2.18614 | − | 1.26217i | 1.00000 | −2.18614 | + | 1.26217i | −2.18614 | + | 1.26217i | −1.18614 | + | 2.05446i | −1.00000 | 1.68614 | − | 2.92048i | 2.18614 | − | 1.26217i | |||||||||||||||||||
| 725.1 | −1.00000 | −0.686141 | − | 0.396143i | 1.00000 | 0.686141 | + | 0.396143i | 0.686141 | + | 0.396143i | 1.68614 | + | 2.92048i | −1.00000 | −1.18614 | − | 2.05446i | −0.686141 | − | 0.396143i | |||||||||||||||||||
| 725.2 | −1.00000 | 2.18614 | + | 1.26217i | 1.00000 | −2.18614 | − | 1.26217i | −2.18614 | − | 1.26217i | −1.18614 | − | 2.05446i | −1.00000 | 1.68614 | + | 2.92048i | 2.18614 | + | 1.26217i | |||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 473.i | even | 6 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 946.2.h.b | ✓ | 4 |
| 11.b | odd | 2 | 1 | 946.2.h.d | yes | 4 | |
| 43.d | odd | 6 | 1 | 946.2.h.d | yes | 4 | |
| 473.i | even | 6 | 1 | inner | 946.2.h.b | ✓ | 4 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 946.2.h.b | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 946.2.h.b | ✓ | 4 | 473.i | even | 6 | 1 | inner |
| 946.2.h.d | yes | 4 | 11.b | odd | 2 | 1 | |
| 946.2.h.d | yes | 4 | 43.d | odd | 6 | 1 | |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(946, [\chi])\):
|
\( T_{3}^{4} - 3T_{3}^{3} + T_{3}^{2} + 6T_{3} + 4 \)
|
|
\( T_{7}^{4} - T_{7}^{3} + 9T_{7}^{2} + 8T_{7} + 64 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T + 1)^{4} \)
|
| $3$ |
\( T^{4} - 3 T^{3} + \cdots + 4 \)
|
| $5$ |
\( T^{4} + 3 T^{3} + \cdots + 4 \)
|
| $7$ |
\( T^{4} - T^{3} + \cdots + 64 \)
|
| $11$ |
\( (T^{2} + 11)^{2} \)
|
| $13$ |
\( T^{4} - 3 T^{3} + \cdots + 576 \)
|
| $17$ |
\( T^{4} + 3 T^{3} + \cdots + 4 \)
|
| $19$ |
\( (T^{2} + T + 1)^{2} \)
|
| $23$ |
\( T^{4} + 9 T^{3} + \cdots + 144 \)
|
| $29$ |
\( T^{4} + 33T^{2} + 1089 \)
|
| $31$ |
\( T^{4} + 4 T^{3} + \cdots + 841 \)
|
| $37$ |
\( T^{4} + 21 T^{3} + \cdots + 144 \)
|
| $41$ |
\( T^{4} + 112T^{2} + 1024 \)
|
| $43$ |
\( (T^{2} + 8 T + 43)^{2} \)
|
| $47$ |
\( (T^{2} + 3 T - 72)^{2} \)
|
| $53$ |
\( T^{4} - 3 T^{3} + \cdots + 36 \)
|
| $59$ |
\( (T - 12)^{4} \)
|
| $61$ |
\( T^{4} - 4 T^{3} + \cdots + 841 \)
|
| $67$ |
\( T^{4} - 23 T^{3} + \cdots + 15376 \)
|
| $71$ |
\( T^{4} + 6 T^{3} + \cdots + 1681 \)
|
| $73$ |
\( T^{4} - 25 T^{3} + \cdots + 21904 \)
|
| $79$ |
\( T^{4} + 15 T^{3} + \cdots + 36 \)
|
| $83$ |
\( T^{4} - 48 T^{3} + \cdots + 32761 \)
|
| $89$ |
\( T^{4} - 15 T^{3} + \cdots + 13456 \)
|
| $97$ |
\( (T^{2} + 5 T - 2)^{2} \)
|
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