Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [320,2,Mod(289,320)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(320, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([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("320.289");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 320 = 2^{6} \cdot 5 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 320.f (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: | \(2.55521286468\) |
| 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: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 2^{10} \) |
| 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
| \(\beta_{1}\) | \(=\) |
\( 2\zeta_{24}^{6} \)
|
| \(\beta_{2}\) | \(=\) |
\( -\zeta_{24}^{5} - \zeta_{24}^{3} + \zeta_{24} \)
|
| \(\beta_{3}\) | \(=\) |
\( -2\zeta_{24}^{6} + 4\zeta_{24}^{2} \)
|
| \(\beta_{4}\) | \(=\) |
\( -2\zeta_{24}^{7} + \zeta_{24}^{5} + \zeta_{24}^{3} + \zeta_{24} \)
|
| \(\beta_{5}\) | \(=\) |
\( -\zeta_{24}^{5} + 2\zeta_{24}^{4} + \zeta_{24}^{3} + \zeta_{24} - 1 \)
|
| \(\beta_{6}\) | \(=\) |
\( -\zeta_{24}^{5} - 2\zeta_{24}^{4} + \zeta_{24}^{3} + \zeta_{24} + 1 \)
|
| \(\beta_{7}\) | \(=\) |
\( 4\zeta_{24}^{7} + 2\zeta_{24}^{5} - 2\zeta_{24}^{3} + 2\zeta_{24} \)
|
| \(\zeta_{24}\) | \(=\) |
\( ( \beta_{7} + \beta_{6} + \beta_{5} + 2\beta_{4} + 2\beta_{2} ) / 8 \)
|
| \(\zeta_{24}^{2}\) | \(=\) |
\( ( \beta_{3} + \beta_1 ) / 4 \)
|
| \(\zeta_{24}^{3}\) | \(=\) |
\( ( \beta_{6} + \beta_{5} - 2\beta_{2} ) / 4 \)
|
| \(\zeta_{24}^{4}\) | \(=\) |
\( ( -\beta_{6} + \beta_{5} + 2 ) / 4 \)
|
| \(\zeta_{24}^{5}\) | \(=\) |
\( ( \beta_{7} - \beta_{6} - \beta_{5} + 2\beta_{4} - 2\beta_{2} ) / 8 \)
|
| \(\zeta_{24}^{6}\) | \(=\) |
\( ( \beta_1 ) / 2 \)
|
| \(\zeta_{24}^{7}\) | \(=\) |
\( ( \beta_{7} + \beta_{6} + \beta_{5} - 2\beta_{4} - 2\beta_{2} ) / 8 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/320\mathbb{Z}\right)^\times\).
| \(n\) | \(191\) | \(257\) | \(261\) |
| \(\chi(n)\) | \(1\) | \(-1\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 289.1 |
|
0 | −2.44949 | 0 | −1.41421 | − | 1.73205i | 0 | 1.41421i | 0 | 3.00000 | 0 | ||||||||||||||||||||||||||||||||||||||||
| 289.2 | 0 | −2.44949 | 0 | −1.41421 | + | 1.73205i | 0 | − | 1.41421i | 0 | 3.00000 | 0 | ||||||||||||||||||||||||||||||||||||||||
| 289.3 | 0 | −2.44949 | 0 | 1.41421 | − | 1.73205i | 0 | 1.41421i | 0 | 3.00000 | 0 | |||||||||||||||||||||||||||||||||||||||||
| 289.4 | 0 | −2.44949 | 0 | 1.41421 | + | 1.73205i | 0 | − | 1.41421i | 0 | 3.00000 | 0 | ||||||||||||||||||||||||||||||||||||||||
| 289.5 | 0 | 2.44949 | 0 | −1.41421 | − | 1.73205i | 0 | − | 1.41421i | 0 | 3.00000 | 0 | ||||||||||||||||||||||||||||||||||||||||
| 289.6 | 0 | 2.44949 | 0 | −1.41421 | + | 1.73205i | 0 | 1.41421i | 0 | 3.00000 | 0 | |||||||||||||||||||||||||||||||||||||||||
| 289.7 | 0 | 2.44949 | 0 | 1.41421 | − | 1.73205i | 0 | − | 1.41421i | 0 | 3.00000 | 0 | ||||||||||||||||||||||||||||||||||||||||
| 289.8 | 0 | 2.44949 | 0 | 1.41421 | + | 1.73205i | 0 | 1.41421i | 0 | 3.00000 | 0 | |||||||||||||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 4.b | odd | 2 | 1 | inner |
| 5.b | even | 2 | 1 | inner |
| 8.b | even | 2 | 1 | inner |
| 8.d | odd | 2 | 1 | inner |
| 20.d | odd | 2 | 1 | inner |
| 40.e | odd | 2 | 1 | inner |
| 40.f | even | 2 | 1 | inner |
Twists
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{2} - 6 \)
acting on \(S_{2}^{\mathrm{new}}(320, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{8} \)
|
| $3$ |
\( (T^{2} - 6)^{4} \)
|
| $5$ |
\( (T^{4} + 2 T^{2} + 25)^{2} \)
|
| $7$ |
\( (T^{2} + 2)^{4} \)
|
| $11$ |
\( (T^{2} + 4)^{4} \)
|
| $13$ |
\( (T^{2} - 32)^{4} \)
|
| $17$ |
\( (T^{2} + 24)^{4} \)
|
| $19$ |
\( (T^{2} + 36)^{4} \)
|
| $23$ |
\( (T^{2} + 50)^{4} \)
|
| $29$ |
\( (T^{2} + 48)^{4} \)
|
| $31$ |
\( (T^{2} - 48)^{4} \)
|
| $37$ |
\( (T^{2} - 8)^{4} \)
|
| $41$ |
\( (T + 4)^{8} \)
|
| $43$ |
\( (T^{2} - 6)^{4} \)
|
| $47$ |
\( (T^{2} + 18)^{4} \)
|
| $53$ |
\( T^{8} \)
|
| $59$ |
\( (T^{2} + 4)^{4} \)
|
| $61$ |
\( (T^{2} + 12)^{4} \)
|
| $67$ |
\( (T^{2} - 6)^{4} \)
|
| $71$ |
\( (T^{2} - 48)^{4} \)
|
| $73$ |
\( (T^{2} + 24)^{4} \)
|
| $79$ |
\( (T^{2} - 48)^{4} \)
|
| $83$ |
\( (T^{2} - 150)^{4} \)
|
| $89$ |
\( (T + 2)^{8} \)
|
| $97$ |
\( (T^{2} + 216)^{4} \)
|
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