Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [7056,2,Mod(881,7056)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(7056, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 1, 1]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("7056.881");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 7056 = 2^{4} \cdot 3^{2} \cdot 7^{2} \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 7056.k (of order \(2\), degree \(1\), 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: | \(56.3424436662\) |
| Analytic rank: | \(0\) |
| Dimension: | \(8\) |
| Coefficient field: | \(\Q(\zeta_{24})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{8} - x^{4} + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{19}]\) |
| Coefficient ring index: | \( 2^{6}\cdot 3^{4} \) |
| Twist minimal: | no (minimal twist has level 126) |
| 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
| \(\beta_{1}\) | \(=\) |
\( 2\zeta_{24}^{4} - 1 \)
|
| \(\beta_{2}\) | \(=\) |
\( 3\zeta_{24}^{5} + 3\zeta_{24}^{3} - 3\zeta_{24} \)
|
| \(\beta_{3}\) | \(=\) |
\( 2\zeta_{24}^{7} + \zeta_{24}^{5} - \zeta_{24}^{3} + \zeta_{24} \)
|
| \(\beta_{4}\) | \(=\) |
\( -3\zeta_{24}^{5} + 3\zeta_{24}^{3} + 3\zeta_{24} \)
|
| \(\beta_{5}\) | \(=\) |
\( -2\zeta_{24}^{7} - \zeta_{24}^{6} + \zeta_{24}^{5} + \zeta_{24}^{3} + 2\zeta_{24}^{2} + \zeta_{24} \)
|
| \(\beta_{6}\) | \(=\) |
\( 2\zeta_{24}^{7} - 2\zeta_{24}^{6} - \zeta_{24}^{5} - \zeta_{24}^{3} + 4\zeta_{24}^{2} - \zeta_{24} \)
|
| \(\beta_{7}\) | \(=\) |
\( -3\zeta_{24}^{6} \)
|
| \(\zeta_{24}\) | \(=\) |
\( ( -\beta_{6} + 2\beta_{5} + \beta_{4} + 3\beta_{3} - \beta_{2} ) / 12 \)
|
| \(\zeta_{24}^{2}\) | \(=\) |
\( ( -\beta_{7} + \beta_{6} + \beta_{5} ) / 6 \)
|
| \(\zeta_{24}^{3}\) | \(=\) |
\( ( \beta_{4} + \beta_{2} ) / 6 \)
|
| \(\zeta_{24}^{4}\) | \(=\) |
\( ( \beta _1 + 1 ) / 2 \)
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| \(\zeta_{24}^{5}\) | \(=\) |
\( ( -\beta_{6} + 2\beta_{5} - \beta_{4} + 3\beta_{3} + \beta_{2} ) / 12 \)
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| \(\zeta_{24}^{6}\) | \(=\) |
\( ( -\beta_{7} ) / 3 \)
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| \(\zeta_{24}^{7}\) | \(=\) |
\( ( \beta_{6} - 2\beta_{5} + \beta_{4} + 3\beta_{3} + \beta_{2} ) / 12 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/7056\mathbb{Z}\right)^\times\).
| \(n\) | \(785\) | \(1765\) | \(4609\) | \(6175\) |
| \(\chi(n)\) | \(-1\) | \(1\) | \(-1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 881.1 |
|
0 | 0 | 0 | −4.18154 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||||||||||||||||||||||||||
| 881.2 | 0 | 0 | 0 | −4.18154 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||
| 881.3 | 0 | 0 | 0 | −0.717439 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||
| 881.4 | 0 | 0 | 0 | −0.717439 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||
| 881.5 | 0 | 0 | 0 | 0.717439 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||
| 881.6 | 0 | 0 | 0 | 0.717439 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||
| 881.7 | 0 | 0 | 0 | 4.18154 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||
| 881.8 | 0 | 0 | 0 | 4.18154 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 3.b | odd | 2 | 1 | inner |
| 7.b | odd | 2 | 1 | inner |
| 21.c | even | 2 | 1 | inner |
Twists
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(7056, [\chi])\):
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\( T_{5}^{4} - 18T_{5}^{2} + 9 \)
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\( T_{11}^{2} + 9 \)
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\( T_{13}^{2} + 6 \)
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Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{8} \)
|
| $3$ |
\( T^{8} \)
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| $5$ |
\( (T^{4} - 18 T^{2} + 9)^{2} \)
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| $7$ |
\( T^{8} \)
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| $11$ |
\( (T^{2} + 9)^{4} \)
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| $13$ |
\( (T^{2} + 6)^{4} \)
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| $17$ |
\( (T^{4} - 36 T^{2} + 36)^{2} \)
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| $19$ |
\( (T^{4} + 36 T^{2} + 36)^{2} \)
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| $23$ |
\( (T^{2} + 18)^{4} \)
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| $29$ |
\( (T^{4} + 54 T^{2} + 81)^{2} \)
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| $31$ |
\( (T^{4} + 114 T^{2} + 2601)^{2} \)
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| $37$ |
\( (T^{2} - 8 T - 2)^{4} \)
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| $41$ |
\( (T^{4} - 144 T^{2} + 576)^{2} \)
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| $43$ |
\( (T^{2} + 8 T - 2)^{4} \)
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| $47$ |
\( (T^{4} - 36 T^{2} + 36)^{2} \)
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| $53$ |
\( (T^{4} + 54 T^{2} + 81)^{2} \)
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| $59$ |
\( (T^{4} - 198 T^{2} + 8649)^{2} \)
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| $61$ |
\( (T^{4} + 36 T^{2} + 36)^{2} \)
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| $67$ |
\( (T - 10)^{8} \)
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| $71$ |
\( (T^{4} + 108 T^{2} + 324)^{2} \)
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| $73$ |
\( (T^{4} + 72 T^{2} + 144)^{2} \)
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| $79$ |
\( (T^{2} - 14 T + 31)^{4} \)
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| $83$ |
\( (T^{4} - 54 T^{2} + 441)^{2} \)
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| $89$ |
\( (T^{2} - 108)^{4} \)
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| $97$ |
\( (T^{4} + 198 T^{2} + 2601)^{2} \)
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