Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [19,5,Mod(18,19)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(19, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1]))
N = Newforms(chi, 5, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("19.18");
S:= CuspForms(chi, 5);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 19 \) |
| Weight: | \( k \) | \(=\) | \( 5 \) |
| Character orbit: | \([\chi]\) | \(=\) | 19.b (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: | \(1.96402929859\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | 4.0.12107488.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 35x^{2} + 142 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 1 \) |
| 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 \(1,\beta_1,\beta_2,\beta_3\) 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
\( x^{4} + 35x^{2} + 142 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{2} + 19 ) / 3 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( \nu^{3} + 28\nu ) / 3 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( 3\beta_{2} - 19 \)
|
| \(\nu^{3}\) | \(=\) |
\( 3\beta_{3} - 28\beta_1 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/19\mathbb{Z}\right)^\times\).
| \(n\) | \(2\) |
| \(\chi(n)\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 18.1 |
|
− | 5.50600i | − | 4.25064i | −14.3160 | −6.22800 | −23.4040 | 8.36799 | − | 9.27207i | 62.9321 | 34.2913i | |||||||||||||||||||||||||||
| 18.2 | − | 2.16425i | 16.8206i | 11.3160 | −14.7720 | 36.4040 | 59.6320 | − | 59.1188i | −201.932 | 31.9704i | |||||||||||||||||||||||||||||
| 18.3 | 2.16425i | − | 16.8206i | 11.3160 | −14.7720 | 36.4040 | 59.6320 | 59.1188i | −201.932 | − | 31.9704i | |||||||||||||||||||||||||||||
| 18.4 | 5.50600i | 4.25064i | −14.3160 | −6.22800 | −23.4040 | 8.36799 | 9.27207i | 62.9321 | − | 34.2913i | ||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 19.b | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 19.5.b.b | ✓ | 4 |
| 3.b | odd | 2 | 1 | 171.5.c.c | 4 | ||
| 4.b | odd | 2 | 1 | 304.5.e.c | 4 | ||
| 19.b | odd | 2 | 1 | inner | 19.5.b.b | ✓ | 4 |
| 57.d | even | 2 | 1 | 171.5.c.c | 4 | ||
| 76.d | even | 2 | 1 | 304.5.e.c | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 19.5.b.b | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 19.5.b.b | ✓ | 4 | 19.b | odd | 2 | 1 | inner |
| 171.5.c.c | 4 | 3.b | odd | 2 | 1 | ||
| 171.5.c.c | 4 | 57.d | even | 2 | 1 | ||
| 304.5.e.c | 4 | 4.b | odd | 2 | 1 | ||
| 304.5.e.c | 4 | 76.d | even | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{4} + 35T_{2}^{2} + 142 \)
acting on \(S_{5}^{\mathrm{new}}(19, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} + 35T^{2} + 142 \)
|
| $3$ |
\( T^{4} + 301T^{2} + 5112 \)
|
| $5$ |
\( (T^{2} + 21 T + 92)^{2} \)
|
| $7$ |
\( (T^{2} - 68 T + 499)^{2} \)
|
| $11$ |
\( (T^{2} - 111 T - 2194)^{2} \)
|
| $13$ |
\( T^{4} + 37061 T^{2} + 276731872 \)
|
| $17$ |
\( (T^{2} - 150 T - 4887)^{2} \)
|
| $19$ |
\( T^{4} + \cdots + 16983563041 \)
|
| $23$ |
\( (T^{2} + 39 T - 232654)^{2} \)
|
| $29$ |
\( T^{4} + \cdots + 321440583928 \)
|
| $31$ |
\( T^{4} + \cdots + 2573095457248 \)
|
| $37$ |
\( T^{4} + \cdots + 1246928875488 \)
|
| $41$ |
\( T^{4} + \cdots + 671445252832 \)
|
| $43$ |
\( (T^{2} - 1493 T - 1691156)^{2} \)
|
| $47$ |
\( (T^{2} + 3789 T + 3457274)^{2} \)
|
| $53$ |
\( T^{4} + \cdots + 1649118527352 \)
|
| $59$ |
\( T^{4} + \cdots + 147332683451872 \)
|
| $61$ |
\( (T^{2} - 79 T - 532088)^{2} \)
|
| $67$ |
\( T^{4} + \cdots + 23408787518008 \)
|
| $71$ |
\( T^{4} + \cdots + 82524177119232 \)
|
| $73$ |
\( (T^{2} + 7584 T + 12244671)^{2} \)
|
| $79$ |
\( T^{4} + \cdots + 33729223648 \)
|
| $83$ |
\( (T^{2} - 16638 T + 67953008)^{2} \)
|
| $89$ |
\( T^{4} + \cdots + 96\!\cdots\!68 \)
|
| $97$ |
\( T^{4} + \cdots + 68352898480000 \)
|
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