Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [30,5,Mod(7,30)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(30, base_ring=CyclotomicField(4))
chi = DirichletCharacter(H, H._module([0, 1]))
N = Newforms(chi, 5, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("30.7");
S:= CuspForms(chi, 5);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 30 = 2 \cdot 3 \cdot 5 \) |
| Weight: | \( k \) | \(=\) | \( 5 \) |
| Character orbit: | \([\chi]\) | \(=\) | 30.f (of order \(4\), degree \(2\), 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: | \(3.10109889252\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Relative dimension: | \(2\) over \(\Q(i)\) |
| Coefficient field: | \(\Q(i, \sqrt{6})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 9 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 3^{2} \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{4}]$ |
$q$-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
\( x^{4} + 9 \)
:
| \(\beta_{1}\) | \(=\) |
\( 3\nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{2} ) / 3 \)
|
| \(\beta_{3}\) | \(=\) |
\( \nu^{3} \)
|
| \(\nu\) | \(=\) |
\( ( \beta_1 ) / 3 \)
|
| \(\nu^{2}\) | \(=\) |
\( 3\beta_{2} \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{3} \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/30\mathbb{Z}\right)^\times\).
| \(n\) | \(7\) | \(11\) |
| \(\chi(n)\) | \(-\beta_{2}\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 7.1 |
|
−2.00000 | − | 2.00000i | −3.67423 | + | 3.67423i | 8.00000i | 24.6742 | + | 4.02270i | 14.6969 | 44.4393 | + | 44.4393i | 16.0000 | − | 16.0000i | − | 27.0000i | −41.3031 | − | 57.3939i | |||||||||||||||||
| 7.2 | −2.00000 | − | 2.00000i | 3.67423 | − | 3.67423i | 8.00000i | 17.3258 | − | 18.0227i | −14.6969 | −58.4393 | − | 58.4393i | 16.0000 | − | 16.0000i | − | 27.0000i | −70.6969 | + | 1.39388i | ||||||||||||||||||
| 13.1 | −2.00000 | + | 2.00000i | −3.67423 | − | 3.67423i | − | 8.00000i | 24.6742 | − | 4.02270i | 14.6969 | 44.4393 | − | 44.4393i | 16.0000 | + | 16.0000i | 27.0000i | −41.3031 | + | 57.3939i | ||||||||||||||||||
| 13.2 | −2.00000 | + | 2.00000i | 3.67423 | + | 3.67423i | − | 8.00000i | 17.3258 | + | 18.0227i | −14.6969 | −58.4393 | + | 58.4393i | 16.0000 | + | 16.0000i | 27.0000i | −70.6969 | − | 1.39388i | ||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 5.c | odd | 4 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 30.5.f.a | ✓ | 4 |
| 3.b | odd | 2 | 1 | 90.5.g.e | 4 | ||
| 4.b | odd | 2 | 1 | 240.5.bg.b | 4 | ||
| 5.b | even | 2 | 1 | 150.5.f.e | 4 | ||
| 5.c | odd | 4 | 1 | inner | 30.5.f.a | ✓ | 4 |
| 5.c | odd | 4 | 1 | 150.5.f.e | 4 | ||
| 15.d | odd | 2 | 1 | 450.5.g.f | 4 | ||
| 15.e | even | 4 | 1 | 90.5.g.e | 4 | ||
| 15.e | even | 4 | 1 | 450.5.g.f | 4 | ||
| 20.e | even | 4 | 1 | 240.5.bg.b | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 30.5.f.a | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 30.5.f.a | ✓ | 4 | 5.c | odd | 4 | 1 | inner |
| 90.5.g.e | 4 | 3.b | odd | 2 | 1 | ||
| 90.5.g.e | 4 | 15.e | even | 4 | 1 | ||
| 150.5.f.e | 4 | 5.b | even | 2 | 1 | ||
| 150.5.f.e | 4 | 5.c | odd | 4 | 1 | ||
| 240.5.bg.b | 4 | 4.b | odd | 2 | 1 | ||
| 240.5.bg.b | 4 | 20.e | even | 4 | 1 | ||
| 450.5.g.f | 4 | 15.d | odd | 2 | 1 | ||
| 450.5.g.f | 4 | 15.e | even | 4 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{7}^{4} + 28T_{7}^{3} + 392T_{7}^{2} - 145432T_{7} + 26977636 \)
acting on \(S_{5}^{\mathrm{new}}(30, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{2} + 4 T + 8)^{2} \)
|
| $3$ |
\( T^{4} + 729 \)
|
| $5$ |
\( T^{4} - 84 T^{3} + \cdots + 390625 \)
|
| $7$ |
\( T^{4} + 28 T^{3} + \cdots + 26977636 \)
|
| $11$ |
\( (T^{2} - 232 T + 10810)^{2} \)
|
| $13$ |
\( T^{4} + 336 T^{3} + \cdots + 618815376 \)
|
| $17$ |
\( T^{4} + \cdots + 1438229776 \)
|
| $19$ |
\( T^{4} + \cdots + 24945043600 \)
|
| $23$ |
\( T^{4} + \cdots + 4830250000 \)
|
| $29$ |
\( T^{4} + \cdots + 60069108100 \)
|
| $31$ |
\( (T^{2} + 280 T - 276104)^{2} \)
|
| $37$ |
\( T^{4} + \cdots + 307479122064 \)
|
| $41$ |
\( (T^{2} - 196 T - 2193812)^{2} \)
|
| $43$ |
\( T^{4} + \cdots + 273914063424 \)
|
| $47$ |
\( T^{4} + \cdots + 100134845427600 \)
|
| $53$ |
\( T^{4} + \cdots + 4407010106944 \)
|
| $59$ |
\( T^{4} + \cdots + 812612102500 \)
|
| $61$ |
\( (T^{2} + 2268 T - 8149140)^{2} \)
|
| $67$ |
\( T^{4} + \cdots + 502668237829696 \)
|
| $71$ |
\( (T^{2} - 9032 T + 19716880)^{2} \)
|
| $73$ |
\( T^{4} + \cdots + 21\!\cdots\!16 \)
|
| $79$ |
\( T^{4} + \cdots + 12490004174400 \)
|
| $83$ |
\( T^{4} + \cdots + 12\!\cdots\!56 \)
|
| $89$ |
\( T^{4} + \cdots + 50\!\cdots\!00 \)
|
| $97$ |
\( T^{4} + \cdots + 41\!\cdots\!04 \)
|
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