Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [196,3,Mod(67,196)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(196, base_ring=CyclotomicField(6))
chi = DirichletCharacter(H, H._module([3, 4]))
N = Newforms(chi, 3, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("196.67");
S:= CuspForms(chi, 3);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 196 = 2^{2} \cdot 7^{2} \) |
| Weight: | \( k \) | \(=\) | \( 3 \) |
| Character orbit: | \([\chi]\) | \(=\) | 196.g (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: | \(5.34061318146\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Relative dimension: | \(2\) over \(\Q(\zeta_{6})\) |
| Coefficient field: | \(\Q(\sqrt{-3}, \sqrt{-5})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - 5x^{2} + 25 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{9}]\) |
| Coefficient ring index: | \( 2^{2} \) |
| 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
\( x^{4} - 5x^{2} + 25 \)
:
| \(\beta_{1}\) | \(=\) |
\( 2\nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{2} ) / 5 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( 2\nu^{3} ) / 5 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_1 ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( 5\beta_{2} \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 5\beta_{3} ) / 2 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/196\mathbb{Z}\right)^\times\).
| \(n\) | \(99\) | \(101\) |
| \(\chi(n)\) | \(-1\) | \(-\beta_{2}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 67.1 |
|
2.00000 | −3.87298 | − | 2.23607i | 4.00000 | 3.87298 | + | 6.70820i | −7.74597 | − | 4.47214i | 0 | 8.00000 | 5.50000 | + | 9.52628i | 7.74597 | + | 13.4164i | ||||||||||||||||||||
| 67.2 | 2.00000 | 3.87298 | + | 2.23607i | 4.00000 | −3.87298 | − | 6.70820i | 7.74597 | + | 4.47214i | 0 | 8.00000 | 5.50000 | + | 9.52628i | −7.74597 | − | 13.4164i | |||||||||||||||||||||
| 79.1 | 2.00000 | −3.87298 | + | 2.23607i | 4.00000 | 3.87298 | − | 6.70820i | −7.74597 | + | 4.47214i | 0 | 8.00000 | 5.50000 | − | 9.52628i | 7.74597 | − | 13.4164i | |||||||||||||||||||||
| 79.2 | 2.00000 | 3.87298 | − | 2.23607i | 4.00000 | −3.87298 | + | 6.70820i | 7.74597 | − | 4.47214i | 0 | 8.00000 | 5.50000 | − | 9.52628i | −7.74597 | + | 13.4164i | |||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 7.b | odd | 2 | 1 | inner |
| 28.f | even | 6 | 1 | inner |
| 28.g | odd | 6 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 196.3.g.g | 4 | |
| 4.b | odd | 2 | 1 | 196.3.g.c | 4 | ||
| 7.b | odd | 2 | 1 | inner | 196.3.g.g | 4 | |
| 7.c | even | 3 | 1 | 196.3.c.d | ✓ | 4 | |
| 7.c | even | 3 | 1 | 196.3.g.c | 4 | ||
| 7.d | odd | 6 | 1 | 196.3.c.d | ✓ | 4 | |
| 7.d | odd | 6 | 1 | 196.3.g.c | 4 | ||
| 28.d | even | 2 | 1 | 196.3.g.c | 4 | ||
| 28.f | even | 6 | 1 | 196.3.c.d | ✓ | 4 | |
| 28.f | even | 6 | 1 | inner | 196.3.g.g | 4 | |
| 28.g | odd | 6 | 1 | 196.3.c.d | ✓ | 4 | |
| 28.g | odd | 6 | 1 | inner | 196.3.g.g | 4 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 196.3.c.d | ✓ | 4 | 7.c | even | 3 | 1 | |
| 196.3.c.d | ✓ | 4 | 7.d | odd | 6 | 1 | |
| 196.3.c.d | ✓ | 4 | 28.f | even | 6 | 1 | |
| 196.3.c.d | ✓ | 4 | 28.g | odd | 6 | 1 | |
| 196.3.g.c | 4 | 4.b | odd | 2 | 1 | ||
| 196.3.g.c | 4 | 7.c | even | 3 | 1 | ||
| 196.3.g.c | 4 | 7.d | odd | 6 | 1 | ||
| 196.3.g.c | 4 | 28.d | even | 2 | 1 | ||
| 196.3.g.g | 4 | 1.a | even | 1 | 1 | trivial | |
| 196.3.g.g | 4 | 7.b | odd | 2 | 1 | inner | |
| 196.3.g.g | 4 | 28.f | even | 6 | 1 | inner | |
| 196.3.g.g | 4 | 28.g | odd | 6 | 1 | inner | |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{3}^{\mathrm{new}}(196, [\chi])\):
|
\( T_{3}^{4} - 20T_{3}^{2} + 400 \)
|
|
\( T_{5}^{4} + 60T_{5}^{2} + 3600 \)
|
|
\( T_{11}^{2} - 12T_{11} + 48 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T - 2)^{4} \)
|
| $3$ |
\( T^{4} - 20T^{2} + 400 \)
|
| $5$ |
\( T^{4} + 60T^{2} + 3600 \)
|
| $7$ |
\( T^{4} \)
|
| $11$ |
\( (T^{2} - 12 T + 48)^{2} \)
|
| $13$ |
\( (T^{2} - 60)^{2} \)
|
| $17$ |
\( T^{4} + 240 T^{2} + 57600 \)
|
| $19$ |
\( T^{4} - 180 T^{2} + 32400 \)
|
| $23$ |
\( (T^{2} + 36 T + 432)^{2} \)
|
| $29$ |
\( (T + 26)^{4} \)
|
| $31$ |
\( T^{4} - 720 T^{2} + 518400 \)
|
| $37$ |
\( (T^{2} - 2 T + 4)^{2} \)
|
| $41$ |
\( (T^{2} - 2160)^{2} \)
|
| $43$ |
\( (T^{2} + 2352)^{2} \)
|
| $47$ |
\( T^{4} - 6480 T^{2} + 41990400 \)
|
| $53$ |
\( (T^{2} - 46 T + 2116)^{2} \)
|
| $59$ |
\( T^{4} - 4500 T^{2} + 20250000 \)
|
| $61$ |
\( T^{4} + 60T^{2} + 3600 \)
|
| $67$ |
\( (T^{2} + 156 T + 8112)^{2} \)
|
| $71$ |
\( (T^{2} + 9408)^{2} \)
|
| $73$ |
\( T^{4} + 15360 T^{2} + 235929600 \)
|
| $79$ |
\( (T^{2} - 48 T + 768)^{2} \)
|
| $83$ |
\( (T^{2} + 8820)^{2} \)
|
| $89$ |
\( T^{4} + 3840 T^{2} + 14745600 \)
|
| $97$ |
\( (T^{2} - 2160)^{2} \)
|
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