Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [50,22,Mod(49,50)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(50, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1]))
N = Newforms(chi, 22, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("50.49");
S:= CuspForms(chi, 22);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 50 = 2 \cdot 5^{2} \) |
| Weight: | \( k \) | \(=\) | \( 22 \) |
| Character orbit: | \([\chi]\) | \(=\) | 50.b (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: | \(139.738672144\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\mathbb{Q}[x]/(x^{4} + \cdots)\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 589825x^{2} + 86973087744 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{13}]\) |
| Coefficient ring index: | \( 2^{10}\cdot 3^{2}\cdot 5^{2} \) |
| Twist minimal: | no (minimal twist has level 10) |
| 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 \(1,\beta_1,\beta_2,\beta_3\) 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
\( x^{4} + 589825x^{2} + 86973087744 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( \nu^{3} + 294913\nu ) / 147456 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( 5\nu^{3} + 4423685\nu ) / 12288 \)
|
| \(\beta_{3}\) | \(=\) |
\( 480\nu^{2} + 141558000 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{2} - 60\beta_1 ) / 240 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{3} - 141558000 ) / 480 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( -294913\beta_{2} + 53084220\beta_1 ) / 240 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/50\mathbb{Z}\right)^\times\).
| \(n\) | \(27\) |
| \(\chi(n)\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 49.1 |
|
− | 1024.00i | − | 114848.i | −1.04858e6 | 0 | −1.17604e8 | 2.03949e8i | 1.07374e9i | −2.72970e9 | 0 | ||||||||||||||||||||||||||||
| 49.2 | − | 1024.00i | 145820.i | −1.04858e6 | 0 | 1.49320e8 | 2.36011e8i | 1.07374e9i | −1.08031e10 | 0 | ||||||||||||||||||||||||||||||
| 49.3 | 1024.00i | − | 145820.i | −1.04858e6 | 0 | 1.49320e8 | − | 2.36011e8i | − | 1.07374e9i | −1.08031e10 | 0 | ||||||||||||||||||||||||||||
| 49.4 | 1024.00i | 114848.i | −1.04858e6 | 0 | −1.17604e8 | − | 2.03949e8i | − | 1.07374e9i | −2.72970e9 | 0 | |||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 5.b | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 50.22.b.e | 4 | |
| 5.b | even | 2 | 1 | inner | 50.22.b.e | 4 | |
| 5.c | odd | 4 | 1 | 10.22.a.d | ✓ | 2 | |
| 5.c | odd | 4 | 1 | 50.22.a.d | 2 | ||
| 20.e | even | 4 | 1 | 80.22.a.c | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 10.22.a.d | ✓ | 2 | 5.c | odd | 4 | 1 | |
| 50.22.a.d | 2 | 5.c | odd | 4 | 1 | ||
| 50.22.b.e | 4 | 1.a | even | 1 | 1 | trivial | |
| 50.22.b.e | 4 | 5.b | even | 2 | 1 | inner | |
| 80.22.a.c | 2 | 20.e | even | 4 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{4} + 34453523592T_{3}^{2} + 280466343274321395216 \)
acting on \(S_{22}^{\mathrm{new}}(50, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{2} + 1048576)^{2} \)
|
| $3$ |
\( T^{4} + \cdots + 28\!\cdots\!16 \)
|
| $5$ |
\( T^{4} \)
|
| $7$ |
\( T^{4} + \cdots + 23\!\cdots\!56 \)
|
| $11$ |
\( (T^{2} + \cdots - 65\!\cdots\!36)^{2} \)
|
| $13$ |
\( T^{4} + \cdots + 78\!\cdots\!36 \)
|
| $17$ |
\( T^{4} + \cdots + 49\!\cdots\!16 \)
|
| $19$ |
\( (T^{2} + \cdots - 39\!\cdots\!00)^{2} \)
|
| $23$ |
\( T^{4} + \cdots + 32\!\cdots\!36 \)
|
| $29$ |
\( (T^{2} + \cdots - 74\!\cdots\!00)^{2} \)
|
| $31$ |
\( (T^{2} + \cdots + 47\!\cdots\!64)^{2} \)
|
| $37$ |
\( T^{4} + \cdots + 22\!\cdots\!76 \)
|
| $41$ |
\( (T^{2} + \cdots + 98\!\cdots\!24)^{2} \)
|
| $43$ |
\( T^{4} + \cdots + 15\!\cdots\!76 \)
|
| $47$ |
\( T^{4} + \cdots + 10\!\cdots\!76 \)
|
| $53$ |
\( T^{4} + \cdots + 65\!\cdots\!76 \)
|
| $59$ |
\( (T^{2} + \cdots - 22\!\cdots\!00)^{2} \)
|
| $61$ |
\( (T^{2} + \cdots - 29\!\cdots\!76)^{2} \)
|
| $67$ |
\( T^{4} + \cdots + 39\!\cdots\!56 \)
|
| $71$ |
\( (T^{2} + \cdots + 65\!\cdots\!64)^{2} \)
|
| $73$ |
\( T^{4} + \cdots + 53\!\cdots\!96 \)
|
| $79$ |
\( (T^{2} + \cdots - 29\!\cdots\!00)^{2} \)
|
| $83$ |
\( T^{4} + \cdots + 13\!\cdots\!36 \)
|
| $89$ |
\( (T^{2} + \cdots - 20\!\cdots\!00)^{2} \)
|
| $97$ |
\( T^{4} + \cdots + 36\!\cdots\!16 \)
|
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