Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [6720,2,Mod(3361,6720)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(6720, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 1, 0, 0, 0]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("6720.3361");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 6720 = 2^{6} \cdot 3 \cdot 5 \cdot 7 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 6720.g (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: | no |
| Analytic conductor: | \(53.6594701583\) |
| Analytic rank: | \(0\) |
| Dimension: | \(8\) |
| Coefficient field: | 8.0.191102976.5 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{8} - 6x^{6} + 6x^{4} + 36x^{2} + 36 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{17}]\) |
| Coefficient ring index: | \( 2^{8} \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{2}]$ |
$q$-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 \(1,\beta_1,\ldots,\beta_{7}\) 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
\( x^{8} - 6x^{6} + 6x^{4} + 36x^{2} + 36 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( -\nu^{7} + 9\nu^{5} - 3\nu^{3} - 72\nu ) / 45 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( 2\nu^{7} - 18\nu^{5} + 51\nu^{3} + 54\nu ) / 45 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( 4\nu^{7} - 21\nu^{5} + 12\nu^{3} + 198\nu ) / 45 \)
|
| \(\beta_{4}\) | \(=\) |
\( ( \nu^{6} - 6\nu^{4} + 12\nu^{2} + 18 ) / 18 \)
|
| \(\beta_{5}\) | \(=\) |
\( ( -\nu^{6} + 4\nu^{4} + 12\nu^{2} - 42 ) / 15 \)
|
| \(\beta_{6}\) | \(=\) |
\( ( -8\nu^{7} + 57\nu^{5} - 114\nu^{3} - 126\nu ) / 45 \)
|
| \(\beta_{7}\) | \(=\) |
\( ( -2\nu^{6} + 18\nu^{4} - 36\nu^{2} - 54 ) / 15 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{6} + \beta_{3} + 2\beta_{2} ) / 4 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{7} + 3\beta_{5} + 6\beta_{4} + 6 ) / 4 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( \beta_{6} + \beta_{3} + 4\beta_{2} + 4\beta_1 ) / 2 \)
|
| \(\nu^{4}\) | \(=\) |
\( ( 6\beta_{7} + 3\beta_{5} + 18\beta_{4} + 12 ) / 2 \)
|
| \(\nu^{5}\) | \(=\) |
\( ( 3\beta_{6} + 9\beta_{3} + 6\beta_{2} + 24\beta_1 ) / 2 \)
|
| \(\nu^{6}\) | \(=\) |
\( 15\beta_{7} + 54\beta_{4} \)
|
| \(\nu^{7}\) | \(=\) |
\( -6\beta_{6} + 21\beta_{3} - 15\beta_{2} + 57\beta_1 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/6720\mathbb{Z}\right)^\times\).
| \(n\) | \(1471\) | \(1921\) | \(3781\) | \(4481\) | \(5377\) |
| \(\chi(n)\) | \(1\) | \(1\) | \(-1\) | \(1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3361.1 |
|
0 | − | 1.00000i | 0 | 1.00000i | 0 | 1.00000 | 0 | −1.00000 | 0 | |||||||||||||||||||||||||||||||||||||||||
| 3361.2 | 0 | − | 1.00000i | 0 | 1.00000i | 0 | 1.00000 | 0 | −1.00000 | 0 | ||||||||||||||||||||||||||||||||||||||||||
| 3361.3 | 0 | − | 1.00000i | 0 | 1.00000i | 0 | 1.00000 | 0 | −1.00000 | 0 | ||||||||||||||||||||||||||||||||||||||||||
| 3361.4 | 0 | − | 1.00000i | 0 | 1.00000i | 0 | 1.00000 | 0 | −1.00000 | 0 | ||||||||||||||||||||||||||||||||||||||||||
| 3361.5 | 0 | 1.00000i | 0 | − | 1.00000i | 0 | 1.00000 | 0 | −1.00000 | 0 | ||||||||||||||||||||||||||||||||||||||||||
| 3361.6 | 0 | 1.00000i | 0 | − | 1.00000i | 0 | 1.00000 | 0 | −1.00000 | 0 | ||||||||||||||||||||||||||||||||||||||||||
| 3361.7 | 0 | 1.00000i | 0 | − | 1.00000i | 0 | 1.00000 | 0 | −1.00000 | 0 | ||||||||||||||||||||||||||||||||||||||||||
| 3361.8 | 0 | 1.00000i | 0 | − | 1.00000i | 0 | 1.00000 | 0 | −1.00000 | 0 | ||||||||||||||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 8.b | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 6720.2.g.t | yes | 8 |
| 4.b | odd | 2 | 1 | 6720.2.g.n | ✓ | 8 | |
| 8.b | even | 2 | 1 | inner | 6720.2.g.t | yes | 8 |
| 8.d | odd | 2 | 1 | 6720.2.g.n | ✓ | 8 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 6720.2.g.n | ✓ | 8 | 4.b | odd | 2 | 1 | |
| 6720.2.g.n | ✓ | 8 | 8.d | odd | 2 | 1 | |
| 6720.2.g.t | yes | 8 | 1.a | even | 1 | 1 | trivial |
| 6720.2.g.t | yes | 8 | 8.b | even | 2 | 1 | inner |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(6720, [\chi])\):
|
\( T_{11}^{4} + 12T_{11}^{2} + 24 \)
|
|
\( T_{13}^{4} + 12T_{13}^{2} + 24 \)
|
|
\( T_{23}^{4} - 72T_{23}^{2} + 96 \)
|
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\( T_{29}^{8} + 96T_{29}^{6} + 2208T_{29}^{4} + 4608T_{29}^{2} + 2304 \)
|
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\( T_{47}^{4} + 8T_{47}^{3} - 48T_{47}^{2} - 256T_{47} - 176 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{8} \)
|
| $3$ |
\( (T^{2} + 1)^{4} \)
|
| $5$ |
\( (T^{2} + 1)^{4} \)
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| $7$ |
\( (T - 1)^{8} \)
|
| $11$ |
\( (T^{4} + 12 T^{2} + 24)^{2} \)
|
| $13$ |
\( (T^{4} + 12 T^{2} + 24)^{2} \)
|
| $17$ |
\( (T^{4} - 8 T^{3} + \cdots - 416)^{2} \)
|
| $19$ |
\( (T^{4} + 36 T^{2} + 24)^{2} \)
|
| $23$ |
\( (T^{4} - 72 T^{2} + 96)^{2} \)
|
| $29$ |
\( T^{8} + 96 T^{6} + \cdots + 2304 \)
|
| $31$ |
\( (T^{4} - 36 T^{2} + 216)^{2} \)
|
| $37$ |
\( T^{8} + 112 T^{6} + \cdots + 1024 \)
|
| $41$ |
\( (T^{4} - 8 T^{3} - 48 T^{2} + \cdots + 64)^{2} \)
|
| $43$ |
\( T^{8} + 64 T^{6} + \cdots + 256 \)
|
| $47$ |
\( (T^{4} + 8 T^{3} + \cdots - 176)^{2} \)
|
| $53$ |
\( T^{8} + 88 T^{6} + \cdots + 40000 \)
|
| $59$ |
\( (T^{4} + 56 T^{2} + 16)^{2} \)
|
| $61$ |
\( T^{8} + 480 T^{6} + \cdots + 84052224 \)
|
| $67$ |
\( T^{8} + 544 T^{6} + \cdots + 2930944 \)
|
| $71$ |
\( (T^{4} + 16 T^{3} + \cdots + 472)^{2} \)
|
| $73$ |
\( (T^{4} - 16 T^{3} + \cdots + 2200)^{2} \)
|
| $79$ |
\( (T^{4} - 8 T^{3} + \cdots + 208)^{2} \)
|
| $83$ |
\( T^{8} + 384 T^{6} + \cdots + 36864 \)
|
| $89$ |
\( (T^{4} - 48 T^{2} + 384)^{2} \)
|
| $97$ |
\( (T^{4} - 16 T^{3} + \cdots - 296)^{2} \)
|
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