Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [490,4,Mod(361,490)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(490, base_ring=CyclotomicField(6))
chi = DirichletCharacter(H, H._module([0, 4]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("490.361");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 490 = 2 \cdot 5 \cdot 7^{2} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 490.e (of order \(3\), 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: | \(28.9109359028\) |
| 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: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 70) |
| 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 \(\left(\mathbb{Z}/490\mathbb{Z}\right)^\times\).
| \(n\) | \(101\) | \(197\) |
| \(\chi(n)\) | \(-\zeta_{6}\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 361.1 |
|
1.00000 | + | 1.73205i | −4.00000 | + | 6.92820i | −2.00000 | + | 3.46410i | −2.50000 | − | 4.33013i | −16.0000 | 0 | −8.00000 | −18.5000 | − | 32.0429i | 5.00000 | − | 8.66025i | ||||||||||||
| 471.1 | 1.00000 | − | 1.73205i | −4.00000 | − | 6.92820i | −2.00000 | − | 3.46410i | −2.50000 | + | 4.33013i | −16.0000 | 0 | −8.00000 | −18.5000 | + | 32.0429i | 5.00000 | + | 8.66025i | |||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 7.c | even | 3 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 490.4.e.j | 2 | |
| 7.b | odd | 2 | 1 | 490.4.e.r | 2 | ||
| 7.c | even | 3 | 1 | 490.4.a.g | 1 | ||
| 7.c | even | 3 | 1 | inner | 490.4.e.j | 2 | |
| 7.d | odd | 6 | 1 | 70.4.a.a | ✓ | 1 | |
| 7.d | odd | 6 | 1 | 490.4.e.r | 2 | ||
| 21.g | even | 6 | 1 | 630.4.a.s | 1 | ||
| 28.f | even | 6 | 1 | 560.4.a.q | 1 | ||
| 35.i | odd | 6 | 1 | 350.4.a.v | 1 | ||
| 35.j | even | 6 | 1 | 2450.4.a.x | 1 | ||
| 35.k | even | 12 | 2 | 350.4.c.n | 2 | ||
| 56.j | odd | 6 | 1 | 2240.4.a.bi | 1 | ||
| 56.m | even | 6 | 1 | 2240.4.a.d | 1 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 70.4.a.a | ✓ | 1 | 7.d | odd | 6 | 1 | |
| 350.4.a.v | 1 | 35.i | odd | 6 | 1 | ||
| 350.4.c.n | 2 | 35.k | even | 12 | 2 | ||
| 490.4.a.g | 1 | 7.c | even | 3 | 1 | ||
| 490.4.e.j | 2 | 1.a | even | 1 | 1 | trivial | |
| 490.4.e.j | 2 | 7.c | even | 3 | 1 | inner | |
| 490.4.e.r | 2 | 7.b | odd | 2 | 1 | ||
| 490.4.e.r | 2 | 7.d | odd | 6 | 1 | ||
| 560.4.a.q | 1 | 28.f | even | 6 | 1 | ||
| 630.4.a.s | 1 | 21.g | even | 6 | 1 | ||
| 2240.4.a.d | 1 | 56.m | even | 6 | 1 | ||
| 2240.4.a.bi | 1 | 56.j | odd | 6 | 1 | ||
| 2450.4.a.x | 1 | 35.j | even | 6 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(490, [\chi])\):
|
\( T_{3}^{2} + 8T_{3} + 64 \)
|
|
\( T_{11}^{2} + 68T_{11} + 4624 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} - 2T + 4 \)
|
| $3$ |
\( T^{2} + 8T + 64 \)
|
| $5$ |
\( T^{2} + 5T + 25 \)
|
| $7$ |
\( T^{2} \)
|
| $11$ |
\( T^{2} + 68T + 4624 \)
|
| $13$ |
\( (T + 34)^{2} \)
|
| $17$ |
\( T^{2} - 74T + 5476 \)
|
| $19$ |
\( T^{2} + 128T + 16384 \)
|
| $23$ |
\( T^{2} - 80T + 6400 \)
|
| $29$ |
\( (T - 286)^{2} \)
|
| $31$ |
\( T^{2} + 24T + 576 \)
|
| $37$ |
\( T^{2} + 294T + 86436 \)
|
| $41$ |
\( (T + 66)^{2} \)
|
| $43$ |
\( (T + 124)^{2} \)
|
| $47$ |
\( T^{2} - 312T + 97344 \)
|
| $53$ |
\( T^{2} - 34T + 1156 \)
|
| $59$ |
\( T^{2} - 168T + 28224 \)
|
| $61$ |
\( T^{2} - 170T + 28900 \)
|
| $67$ |
\( T^{2} + 564T + 318096 \)
|
| $71$ |
\( (T - 616)^{2} \)
|
| $73$ |
\( T^{2} - 250T + 62500 \)
|
| $79$ |
\( T^{2} - 944T + 891136 \)
|
| $83$ |
\( (T + 672)^{2} \)
|
| $89$ |
\( T^{2} + 1430 T + 2044900 \)
|
| $97$ |
\( (T - 1270)^{2} \)
|
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