Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [336,4,Mod(17,336)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(336, base_ring=CyclotomicField(6))
chi = DirichletCharacter(H, H._module([0, 0, 3, 1]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("336.17");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 336 = 2^{4} \cdot 3 \cdot 7 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 336.bc (of order \(6\), degree \(2\), not 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: | \(19.8246417619\) |
| 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: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 84) |
| Sato-Tate group: | $\mathrm{U}(1)[D_{6}]$ |
$q$-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 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 \(\left(\mathbb{Z}/336\mathbb{Z}\right)^\times\).
| \(n\) | \(85\) | \(113\) | \(127\) | \(241\) |
| \(\chi(n)\) | \(1\) | \(-1\) | \(1\) | \(\zeta_{6}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 17.1 |
|
0 | −4.50000 | − | 2.59808i | 0 | 0 | 0 | −18.5000 | − | 0.866025i | 0 | 13.5000 | + | 23.3827i | 0 | ||||||||||||||||||
| 257.1 | 0 | −4.50000 | + | 2.59808i | 0 | 0 | 0 | −18.5000 | + | 0.866025i | 0 | 13.5000 | − | 23.3827i | 0 | |||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 3.b | odd | 2 | 1 | CM by \(\Q(\sqrt{-3}) \) |
| 7.d | odd | 6 | 1 | inner |
| 21.g | even | 6 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 336.4.bc.a | 2 | |
| 3.b | odd | 2 | 1 | CM | 336.4.bc.a | 2 | |
| 4.b | odd | 2 | 1 | 84.4.k.b | ✓ | 2 | |
| 7.d | odd | 6 | 1 | inner | 336.4.bc.a | 2 | |
| 12.b | even | 2 | 1 | 84.4.k.b | ✓ | 2 | |
| 21.g | even | 6 | 1 | inner | 336.4.bc.a | 2 | |
| 28.d | even | 2 | 1 | 588.4.k.a | 2 | ||
| 28.f | even | 6 | 1 | 84.4.k.b | ✓ | 2 | |
| 28.f | even | 6 | 1 | 588.4.f.b | 2 | ||
| 28.g | odd | 6 | 1 | 588.4.f.b | 2 | ||
| 28.g | odd | 6 | 1 | 588.4.k.a | 2 | ||
| 84.h | odd | 2 | 1 | 588.4.k.a | 2 | ||
| 84.j | odd | 6 | 1 | 84.4.k.b | ✓ | 2 | |
| 84.j | odd | 6 | 1 | 588.4.f.b | 2 | ||
| 84.n | even | 6 | 1 | 588.4.f.b | 2 | ||
| 84.n | even | 6 | 1 | 588.4.k.a | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 84.4.k.b | ✓ | 2 | 4.b | odd | 2 | 1 | |
| 84.4.k.b | ✓ | 2 | 12.b | even | 2 | 1 | |
| 84.4.k.b | ✓ | 2 | 28.f | even | 6 | 1 | |
| 84.4.k.b | ✓ | 2 | 84.j | odd | 6 | 1 | |
| 336.4.bc.a | 2 | 1.a | even | 1 | 1 | trivial | |
| 336.4.bc.a | 2 | 3.b | odd | 2 | 1 | CM | |
| 336.4.bc.a | 2 | 7.d | odd | 6 | 1 | inner | |
| 336.4.bc.a | 2 | 21.g | even | 6 | 1 | inner | |
| 588.4.f.b | 2 | 28.f | even | 6 | 1 | ||
| 588.4.f.b | 2 | 28.g | odd | 6 | 1 | ||
| 588.4.f.b | 2 | 84.j | odd | 6 | 1 | ||
| 588.4.f.b | 2 | 84.n | even | 6 | 1 | ||
| 588.4.k.a | 2 | 28.d | even | 2 | 1 | ||
| 588.4.k.a | 2 | 28.g | odd | 6 | 1 | ||
| 588.4.k.a | 2 | 84.h | odd | 2 | 1 | ||
| 588.4.k.a | 2 | 84.n | even | 6 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(336, [\chi])\):
|
\( T_{5} \)
|
|
\( T_{13}^{2} + 867 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} \)
|
| $3$ |
\( T^{2} + 9T + 27 \)
|
| $5$ |
\( T^{2} \)
|
| $7$ |
\( T^{2} + 37T + 343 \)
|
| $11$ |
\( T^{2} \)
|
| $13$ |
\( T^{2} + 867 \)
|
| $17$ |
\( T^{2} \)
|
| $19$ |
\( T^{2} + 51T + 867 \)
|
| $23$ |
\( T^{2} \)
|
| $29$ |
\( T^{2} \)
|
| $31$ |
\( T^{2} - 597T + 118803 \)
|
| $37$ |
\( T^{2} + 433T + 187489 \)
|
| $41$ |
\( T^{2} \)
|
| $43$ |
\( (T - 449)^{2} \)
|
| $47$ |
\( T^{2} \)
|
| $53$ |
\( T^{2} \)
|
| $59$ |
\( T^{2} \)
|
| $61$ |
\( T^{2} - 1620 T + 874800 \)
|
| $67$ |
\( T^{2} - 1007 T + 1014049 \)
|
| $71$ |
\( T^{2} \)
|
| $73$ |
\( T^{2} - 1461 T + 711507 \)
|
| $79$ |
\( T^{2} - 503T + 253009 \)
|
| $83$ |
\( T^{2} \)
|
| $89$ |
\( T^{2} \)
|
| $97$ |
\( T^{2} + 1881792 \)
|
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